The Early Cretaceous palaeogeography of eastern China remains debated, with limited biological evidence available to constrain palaeotopographic differentiation. Palynological records provide a delicate archive of vegetation composition and ecological heterogeneity, offering valuable insights into palaeoenvironmental conditions. This study presents a high-resolution palynological record from the Huangyadi profile in the Laiyang Sag of the Jiaolai Basin, North China Craton, based on 42 shale samples. Quantitative palynological data are integrated with published palaeobotanical macrofossil records to reconstruct vegetation composition and assess their palaeoenvironmental significance. Assemblages are dominated by Pinuspollenites, Abietineaepollenites, Piceaepollenites, Classopollis, and Cicatricosisporites, indicating that plant communities adapted to contrasting ecological conditions. The persistent co-occurrence of taxa exhibiting warm–hot humid, warm–hot arid, and cool temperate semi-arid ecological affinities indicates pronounced ecological heterogeneity. Horizons containing the xerothermic conifer Elatides laiyangensis coincide with increased abundances of Cicatricosisporites, Osmundacidites, and Pinuspollenites, implying a spatial association between ecologically distinct vegetation types. The long-term coexistence of taxa with divergent ecological affinities does not reflect a homogeneous, low-relief landscape but instead indicates environments featuring local to regional topographic relief, possibly representing an intermontane basin setting. Comparison with coeval records from northeastern China and the Hebei–western Liaoning region reveals similar mixed vegetation patterns, indicating that topography-related ecological heterogeneity was prevalent across eastern China. Overall, these high-resolution palynological assemblages help to constrain vegetation distribution and palaeoenvironmental heterogeneity, highlighting the potential of palynofloral ecological data as a proxy for palaeotopographic differentiation in Early Cretaceous continental basins.

The Cretaceous fluvial-lacustrine successions of continental East Asia preserve valuable mid-latitude palaeoclimatic archives that record terrestrial responses to greenhouse climate perturbations. In this study, we integrate palynological, geochemical, and clay mineral data from the Lower Cretaceous Zhifengzhuang and Shuinan formations in the Jiaolai Basin, East China, to investigate the coupled evolution of palaeotopography, climate, vegetation, and chemical weathering. An Early Aptian hyperthermal interval is identified in the lower Shuinan Formation, characterised by increased temperatures and reduced effective humidity inferred from multiple proxies, including chemical index of alteration, index of compositional variability, and palynomorph assemblages. Vertical stratification of vegetation indicates deposition within an intermontane basin with pronounced topographic relief, in which highelevation mountain ranges along the eastern margin locally restricted moisture availability. Following this interval, multiple proxies record a transition towards more humid conditions and a reduction in topographic moisture limitation. Increased water availability reduces the climatic imprint of topography, allowing broader-scale climate forcing to dominate regional environmental conditions. These findings demonstrate that topography can amplify terrestrial moisture stress during greenhouse hyperthermal episodes, while its influence weakens under more humid post-crisis conditions, reflecting a non-linear continental response to Early Cretaceous warming.

Enhanced chemical weathering is a well-documented consequence of the warming associated with the Early Cretaceous Oceanic Anoxic Event 1a. This process likely contributed to the reduction of greenhouse gas levels and facilitated the termination of the event. While the role of enhanced silicate weathering as a terminator of Oceanic Anoxic Event 1a has been established, the coeval changes in silicate weathering in inland East Asia, which is far from the ocean, are not well-known. This study analysed strontium-isotope, oxygen-carbon isotope, clay mineral, and elemental geochemistry in shales and dolomites from three Early Cretaceous terrestrial sections (Zhifengzhuang, Shuinan and Lingshandao formations) within the North China Craton to decipher silicate weathering patterns during Oceanic Anoxic Event 1a. The results revealed that the dramatic warming associated with Oceanic Anoxic Event 1a led to a severe hydroclimatic crisis in East China, where aridification decreased lake levels and rapidly increased their salinity. However, chemical weathering was extremely weak during this period. These findings aligned with equivalent data obtained from two contemporaneous terrestrial sections (Chaoyang and Fuxin basins) located further north-east on the North China Craton. Anomalously low silicate weathering during the Oceanic Anoxic Event 1a hyperthermal interval resulted in ineffective climate regulation within the North China Craton. Finally, Sr-isotope ratios were compared with equivalent data from two coeval marine sections (Resolution Guyot in the Pacific Ocean and Gucuo in Tibet). During the initial stage of Oceanic Anoxic Event 1a in Tibet, chemical weathering, indicated by weathering indicators, intensified. This finding presented a stark contrast to the results from the study areas. The gradual increase in the measured Sr-isotope ratios at the end of this event contrasted with the decline observed at Resolution Guyot. This contrast was attributed to the stronger influence of humidity, compared with temperature, on continental weathering in inland arid areas under greenhouse regimes. Consequently, as Oceanic Anoxic Event 1a came to an end with increased humidity, chemical weathering gradually intensified. This study provides insights into the closely linked dynamics of climatic, environmental and chemical weathering factors, which ultimately enhances our understanding of Earth's responses to the Oceanic Anoxic Event 1a hyperthermal event.

This field trip guide provides an opportunity for participants to study the Cretaceous stratigraphy and sedimentology in the Jiaolai Basin, eastern Shandong province. This sedimentary cover consists of terrestrial clastic sediments and volcaniclastics that belong to the Laiyang Group, the Qingshan Group, and the Wangshi Group. The sediments of these groups contain the Jehol biota, composed of hadrosaur fauna and dinosaur eggs, respectively. Lingshan Island, which is located in the western Yellow Sea, 37 km south of Qingdao, originated in the Early Cretaceous as part of a depositional basin and subsequently as part of a volcanic arc. It became uplifted by later extrusion-related tectonic tilting. The overall dip direction of the rocks is ENE. In spite of this overall simple structure, the tectonic setting is still under debate. Several well-exposed gravity-flow deposits in the Late Cretaceous Lingshandao Formation provide a rare opportunity to study deep-water processes and soft-sediment deformation structures. The Hongtuya Formation of the Wangshi Group in the Laiyang Cretaceous National Geopark contains a set of red clastic rocks which reflect sedimentation in a fluvial delta; a giant hadrosaur was found in these deposits. There are several dinosaur-bearing Late Cretaceous beds in the Shandong Zhucheng National Dinosaur Geopark. It houses the world's largest dinosaur thanatocoenosis in its Dinosaur Ravine fossil gallery, which is about 500 m long and 30 m deep, exposing 10,000 fossil remnants. This tour also includes a visit to the Jimo Mashan Geopark. The boundary between the Cretaceous Laiyang Group and the Qingshan Group with metamorphic rocks is situated here.

ABSTRACT Understanding past weathering–climate feedback mechanisms under greenhouse conditions has significance for guiding the development of climate mitigation strategies. The continental paleoweathering state of Early Cretaceous shales in the Sulu Orogenic Belt of East China during a hyperthermal interval related to oceanic anoxic event 1a (OAE1a) was investigated via geochemical and clay mineralogical analyses of shale samples. The resulting diagrams of ternary 15Al2O3–Zr–300TiO2 discrimination, Th/Sc and Zr/Sc show that the geochemical composition was mainly controlled by source composition. This is supported by observations of low Zr contents, high indexes of compositional variability (ICV; > 1), and micropetrological characteristics. All samples showed narrow SiO2/Al2O3 and (Fe2O3 + MgO)/Al2O3 ranges that were within the predicted weathering trends of the ternary A-CN-K diagram, indicating that the shale geochemistry was not influenced by silicification and K-metasomatism. The chondrite-normalized rare-earth-element pattern suggests that all samples had the same felsic igneous parent rock. The geochemistry of whole rocks and their silicate fractions indicates that the shale had low chemical indexes of alteration (CIA) but high ICV values compared to post-Archean Australian Shale, indicating low sediment maturity and extremely weak chemical weathering in the source terrane and/or sedimentary basin under hot-dry conditions. Moreover, the clay minerals in the shale were mainly illite, suggesting low mineral weathering. Thus, during the OAE1a-related hyperthermal interval, chemical weathering was relatively weak in some mid-latitude arid inland areas. This may be mainly due to aridification decreasing water–rock reactions. Chemostratigraphic analysis suggests that the CIA, Ga/Rb, and Rb/Sr values of shales from the upper strata of the Yangjiazhuang and Shuinan formations were greater than those from lower strata. Moreover, the opposite trend in K2O/Al2O3 ratios was found. These indices suggest gradual increases in chemical weathering as the climate changed from hot-dry to warm-humid. In contrast, proxy indices of shale from the Zhifengzhuang Formation showed the opposite trend, suggesting a gradual decrease in chemical weathering as the climate changed from warm-humid to hot-dry. Considering the composition of the clay minerals, it is speculated that continental weathering was dependent on atmospheric humidity rather than temperature under the extreme greenhouse conditions, resulting in ineffective climate regulation by chemical weathering. This comprehensive study advances our understanding of the weathering–climate feedback mechanism under greenhouse regimes.

The coastal plain of Laizhou Bay in Bohai Sea is a transitional area of land–sea interaction. Sediments in this area can bear significant information of sea-level fluctuation, climate change, as well as regional geological setting. Here, in this study, new sporopollen data from three boreholes (GK138, GK111 and GK95) in the coastal plain of Laizhou Bay, Bohai Sea were investigated, and the pollen spectrum since the late middle Pleistocene was established as six sporopollen assemblage zones (I–VI), i.e., Pinus–Quercus–Artemisia, Gramineae–Artemisia–Chenopodiaceae, Picea–Pinus–Quercus–Artemisia, Picea–Pinus–Betula–Gramineae–Artemisia, Picea–Pinus–Cupressaceae–Chenopodiaceae and Pinus–Quercus–Gramineae–Artemisia–Chenopodiaceae. Combining with existing sedimentary successions and detailed radiocarbon dating results of the sediments from the three boreholes, paleovegetation and climatic evolution since the late middle Pleistocene were reconstructed. The findings revealed that climatic changes in this area since the late middle Pleistocene were characterized by alternating cold-arid and warm-humid conditions, which were well correlated with marine isotopic stages (MIS). The present study offers specific insight into the climatic dynamics in the North China Plain since the late middle Pleistocene and provides evidence of a clear link among the palynoflora in the area, the glacial–interglacial period climate-driven sea-level changes, and the marine δ18O records.

Early Cretaceous saline lacustrine black shales in the Fajiaying Formation were deposited under hothouse conditions and have a complex structure and history of sedimentary evolution. In this study, integrated petrographic and geochemical investigations were utilized to determine the provenance, tectonic setting, and paleoweathering conditions of these shales, therefore revealing their depositional history. Shale in the area under investigation has not been subjected to any post-depositional alteration, mechanical sorting, or recycling, hence its geochemistry has not been affected. The chondrite normalized rare earth elements (REE) pattern of shales displayed typical characteristics, including an enrichment in light REE (LREE), a flat pattern for heavy REE (HREE), and a negative europium (Eu) anomaly. Specific trace element ratios suggested that the sediments were primarily derived from felsic source rocks. Furthermore, there was no discernible shift in the sediment source between the Qiancengya and the Laohuzui sections. The discrimination diagrams of major and trace elements used to understand the tectonic history showed that the majority of the source rocks originated from the active continental margin (ACM) and continental island-arc (CIArc). The bivariate plots and low average values of CIW (chemical index of weathering) and CIA (chemical index of alteration) for the examined shale suggested that chemical weathering in the source terrain under arid conditions was extremely weak. Importantly, with the change of climate from dry-hot to warmhumid, an increase in CIA and CIW was observed which indicated a gradual increase in chemical weathering.

The formation environment of continental evaporite—particularly the sedimentary environment closely related to continental evaporite deposits—has received significant research attention for several years. From this perspective, an intermountain basin exists in the inland area of Northwest China, known as the Kumishi basin. The elevation of this basin is relatively low, where a set of evaporite series strata developed during the late Quaternary. In this paper, we analysed the sedimentary environment of the Kumishi basin in terms of the sulfur isotopes combined with its paleosalinity characteristics. The results show that the δ34SV-CDT isotopic composition ranges from 6 to 11‰. The isotopic fractionation effect of the surface salt crust is significantly lower than that of the lower halite layer owing to the influence of surrounding fresh water and other chemicals. The low sulfur isotopic value is indicative of a typical continental sedimentary environment. In addition, the bacterial sulfate reduction (BSR) indicates that the sulfate formation environment is open to sulfates, and rejects H2S. This phenomenon further indicates the weak bacterial reduction environment in the Kumishi basin. In combination with its paleosalinity characteristics, we determined that the saltwater environment influenced the changes in sulfur isotope value. This can facilitate the further understanding of the sedimentary environment of evaporites in low altitude intermountain basins.

To better understand Early Cretaceous climate variation in inland East Asia, the temporal variation in the chemical index of alteration (CIA) was reconstructed in black shale from an outcrop of the Fajiaying Formation in the Lower Cretaceous Laiyang Group at Lingshan Island, East China. As the formation height increased, the corresponding CIA increased. The obtained index of compositional variability values and an (Al2O3)-(CaO* + Na2O)-K2O ternary diagram demonstrate that the gathered samples had not evolved into K-metasomatism during diagenesis. Moreover, low Zr concentrations parallel to the magmatic trend in the Th/Sc-versus-Zr/Sc diagram reveal that the sediment sorting and recycling did not affect the paleoweathering proxies. The lack of correlation between the CIA and Al/Si or K/Si further suggests that the paleoweathering proxies were not affected by the sediment sorting. Accordingly, as the CIA and the chemical index of weathering increased, the corresponding chemical weathering increased slightly. This is consistent with the transition from a dry-hot climate to a warm-humid one proposed by paleoclimatic proxies such as Rb/Sr, Sr/Cu, Al2O3/MgO, and clay minerals. In this study, a near-ubiquitous correlation is proposed between the variations of paleoclimate and the CIA of shale, in which a rise in humidity significantly increased the chemical weathering. Meanwhile, it was found that under the dry-hot conditions of the Early Cretaceous, chemical weathering in inland areas far from the ocean was relatively weak and dependent on atmospheric humidity. This analysis validates the CIA, as part of the stratigraphic record, to be a robust proxy for terrestrial paleoclimatic variation during the Early Cretaceous.

Important geological events that influenced the global environment occurred during the mid‐Cretaceous period. Dramatically increasing temperatures not only triggered oceanic anoxic events (OAEs) but also led to the aridity of terrestrial environments in East Asia. This study provides evidence for the aridity of a terrestrial East Asian environment during the mid‐Cretaceous and provides an example of the influence of the Cretaceous greenhouse climate on a terrestrial lake system in correspondence with the OAE 1a event. Palaeosalinity indexes (B, B/Ga, Sr/Ba, and Couch's palaeosalinity) and palaeoclimate proxies (Sr/Cu, Rb/Sr, Al 2 O 3 /MgO, and clay mineral compositions) of shale and mudstone from the Laiyang Group of the Jiaolai Basin in Eastern China were analysed. The results demonstrate that the palaeoclimate in the Wawukuang Formation was relatively warm and humid but became extremely dry and hot in the Shuinan Formation during the OAE 1a event before becoming warm and humid again in the Longwangzhuang and Qugezhuang formations. As a result, the palaeosalinity of the Jiaolai Basin increased from 4% in the Wawukuang Formation to 30% in the Shuinan Formation before decreasing to 0.48% in the Longwangzhuang and Qugezhuang formations. The following conclusions are from combining the distributional characteristics of the saliferous strata and its palaeontology, the palaeogeographic background, and the aeolian sandstone in eastern China. (a) The East Asian continental margin was influenced by the Cretaceous greenhouse climate, which resulted in the salinization of the Jiaolai Basin. (b) The significant increase of the palaeosalinity in the Shuinan Formation was an effect of the OAE 1a event on the terrestrial lake system, which further suggests the OAE 1a event was global. (c) Influences of the hothouse climate on the continental lakes changed the palaeosalinity of the water bodies.

针对现有LiDAR地面点滤波算法对复杂地形地物适应性不强的问题,本文提出了一种融合点云与地面影像分块滤波的方法.首先,将地面影像与点云匹配,使点云从影像中获取更多的光谱纹理信息.然后,分析地物光谱、林地相对密度、点云高程特征、地面DSM模型及其坡度,并基于决策级融合将原始点云切割成若干独立的区块.最后,根据每块区域不同的多元细节特征,对IPTD滤波算法进行改进并利用搜索法优化参数,得到最优且稳健的结果.利用滤波后的总地面点通过插值算法得到的DEM模型和相关试验验证了本文算法的优越性.

The early Aptian (similar to 120 Ma) Oceanic Anoxic Event 1a (OAE 1a) was associated with marked changes in palaeoclimate linked to a perturbation of the global carbon cycle. While it is well-studied in the marine realm, OAE 1a is poorly known from continental records. Here, we fill that knowledge-gap by describing OAE 1a from lacustrine facies in the East Asia continental margin (Jiaolai Basin and Lingshan Island in eastern China). Specifically, we integrate data from bulk organic carbon-isotopes (delta C-13(org)), total organic carbon (TOC), and redox-and productivity-sensitive trace elements, as well as existing records on depositional environments, clay mineral compositions, elemental geochemistry and the latest detrital zircon U-Pb ages. We propose a conceptual model of the response of the lake system to OAE 1a through analysis of the palaeoenvironmental and palaeoclimatic context. During the initial stage, an extreme greenhouse climatic event resulted in an abrupt increase in palaeosalinity in the lake system. This led to anoxic conditions, resulting in a high preservation rate of TOC and the development of organic-rich black shale. Organic carbon isotopes documented in the organic-rich black shale show negative and then positive excursions, consistent with the carbon cycle disturbance found in marine OAE 1a records. In addition, the data show that this event may have been associated with a transition from an extreme greenhouse climate to a cooling phase. The framework presented here facilitates further research on the expression of OAE 1a in continental ecosystems and its fingerprint in lacustrine depositional systems.

为了探讨运用B含量和B/Ga比值划分海、陆相存在的问题,对青岛市灵山岛下白垩统莱阳群法家茔组和莱阳市胶莱盆地下白垩统莱阳群水南组的泥页岩进行了微量元素分析.结果表明:B含量和B/Ga比值可以作为古盐度的代理指标,但是内陆咸化湖泊沉积物的B含量和B/Ga比值可以与海相沉积物的相似,在运用这2个指标恢复沉积环境时,不能笼统地将其作为判别海、陆相的决定性证据,需要结合地质背景,并应注意古生物标志等方面的证据,否则会将内陆咸化湖泊环境归为海相沉积环境.该研究可为科学运用B含量和B/Ga比值来恢复沉积环境提供参考.

为了在精确的年代框架下重建黄海末次盛冰期以来古植被、古环境的演变,对NHH01孔上部0～7.3 m(～0～22.0 ka B.P.)岩心样品进行孢粉分析.在65个样品中鉴定出53科81属,根据统计结果中孢粉及碳屑含量变化,划分为9个孢粉组合带,草本植物花粉与针叶、落叶阔叶植物花粉含量此消彼长,反映出气候冷暖、干湿的多次变化,总趋势为气候变暖和海平面上升;识别出3次降温事件,分别在约10.0 ka、7.78～7.33 ka、4.89 ka,新仙女木事件(12.88～11.64 ka)对本区影响不显著,表现为湿冷的气候.本次研究对分析不同纬度地区对气候变化的响应提供了新资料.

The Permian Taiyuan and Shanxi formations exposed in Shandong Province, eastern North China, contain abundant spores and pollen. In this study, a total of 42 genera and 146 species of spores and pollen from these Permian formations, native to northern China, are identified and related to the three epochs of the Permian Period (Cisuralian, Guadalupian, and Lopingian Epochs) as two assemblages: Assemblage I — the Laevigatosporites–Granulatisporites assemblage, inferred as the Cisuralian (~ 298.9–272.9 Ma); and, Assemblage II — the Gulisporites–Sinulatisporites assemblage, inferred as the Guadalupian (~ 272.9–259.1 Ma). Assemblage I represents growing ferns, whereas Assemblage II represents gymnosperms. The assemblage division and analysis indicated that the palaeoclimate of the study area during Early-Middle Permian time was dominated by warm and humid conditions, and later in the Middle Permian changed into moderately dry conditions.

The sedimentary background and sedimentary environment of the Lower Cretaceous of Lingshan Island, Shandong, remain unclear. There is considerable controversy as to whether the sedimentary environment was marine or continental. In this study, analyses were conducted with respect to indicators of paleosalinity, the chemical composition of clay, paleobiota, the characteristics of strata exhibiting salinization in eastern China during the Early Cretaceous, and the relationship between paleosalinity and paleoclimate. The results indicate that the sedimentary environment of the Lower Cretaceous Laiyang Group of Lingshan Island was that of a salified lake rather than a marine environment. This study not only provides a reference for determining the sedimentary environment of the Lower Cretaceous Laiyang Group of Lingshan Island but also offers a new perspective for the study of Cretaceous strata with salinization characteristics in eastern China.

The significance of Cretaceous hothouse climate in terrestrial systems is currently unclear, and its records in terrestrial strata are rarely reported. This study investigated the sedimentary environment of the Fajiaying Formation, characterised by abundant black shale and soft-sediment deformation structures. Five lithofacies have been identified for the Fajiaying Formation, e.g. Facies A: black shale with siltstone inter-bedding, Facies B: black and gray-black shale and siltstone alternations with minor sandstone, Facies C: black and gray-black shale interbedded with gray-black sandstone, Facies D: pebbly sandstone and Facies E: gray-black shale and siltstone. The average TOC content of the shales decreases from fades A (ay. 1.32%) to facies E (ay. 0.46%) through facies B (ay. 0.57%) and facies C (ay. 0.40%). The paleosalinity gradually decreases from lithofacies A to lithofacies E, corresponding to the change of paleoclimate. In addition, Bivariate Scatter Plot of SiO2 and Al2O3 + K2O + Na2O and the clay mineral assemblages suggest an arid climate. Combined with distribution characteristics and paleontology of saliferous strata in eastern China, we determine that hothouse climate influenced the salification of lakes located in eastern China during the Early Cretaceous. Furthermore, the Fajiaying Formation in Lingshan Island was deposited in a terrestrial salifled lake. Salinization of the sedimentary water bodies of the Fajiaying Formation might be related to an oceanic anoxic event. The black shale developed extensively in the Fajiaying Formation and represents the terrestrial record of hothouse climate.

准噶尔盆地车排子凸起西翼的钻井于石炭系火山碎屑岩地层喜获工业油流,展示了火山碎屑岩地层良好的勘探前景.储层非均质性强、油气储运介质特征及分布不明确限制了油气的产量.为探究车排子凸起西翼石炭系火山碎屑岩裂缝特征,综合利用岩心、录井、薄片、测井等资料,对研究区岩性和构造重新鉴别和解释,对车排子地区石炭纪地层储集空间进行分析,结果显示火山碎屑岩储集空间类型以裂缝为主,通过岩心和薄片的观察分析总结得出本区裂缝的发育特征.根据测井资料重新计算裂缝发育参数,运用PDSview软件对裂缝进行量化表征,给出了5个单井裂缝发育程度的评价级别,并分析了裂缝在横向和纵向上的分布特征.最后根据裂缝发育特征总结裂缝发育的影响因素,认为岩性、构造运动和风化淋滤作用共同决定了本区裂缝的发育.

The early Aptian climate change resulted in changes in both the ocean and terrestrial ecosystems. This global climate change is well documented in marine sediments in the form of the oceanic anoxic event (OAE) 1a, but it has rarely been reported from the inland lakes in the East Asian continent. In this study, carbon and oxygen isotopes, quantitative palaeosalinity, clay mineral composition and contents, organic matter content, and detrital zircon ages from the Shuinan and Zhifengzhuang Formations in the Jiaolai Basin were determined to examine whether this global climate change was recorded in inland lakes. This study showed that in the early depositional stage of the Shuinan Formation, the paleo-lake in the Jiaolai Basin was a saline lake with long detention and strong sealing. The climate of the Jiaolai Basin became hotter and drier in the early Aptian (similar to 120 Ma) and the evaporation increased, which increased the palaeosalinity of the Shuinan Formation. High-salinity water, high temperatures, and strong evaporation led to a positive migration of the delta C-13 values. The extreme dry and hot climate documented in the black shale of the Shuinan Formation might serve as a response of inland lakes to OAE 1a. This study provided not only a lacustrine record of an Early Aptian global climate change event but also a new perspective to deepen the understanding of the effects of the Cretaceous climate change in terrestrial ecosystems.

临兴地区山西组是鄂尔多斯盆地晋西挠褶带重要的含气层位,以低孔 、低渗致密砂岩为特点.通过运用岩芯与测井综合解释 、统计及逻辑推理 、优势相分析等方法,建立了临兴地区山西组单井沉积相模式,分析了山西组砂岩储层的展布及物性特征.研究表明:山西组沉积相主要为三角洲沉积相,包括三角洲平原和三角洲前缘2种亚相;三角洲平原进一步可分为分流河道 、分流间洼地和泥炭沼泽3种沉积微相;三角洲前缘可进一步划分为水下分流河道 、分流间湾和席状砂3种沉积微相,该地区砂体发育的优势相与分流河道和水下分流河道的沉积关系密切,有效地控制了优质砂体形成与展布;砂岩展布及物性的变化受沉积相的控制,砂体的特征又对本区气藏有着重要的控制作用;优选出了赵家坪乡-LX10-罗峪口镇 、孟家坪乡-贺家会乡一线和雷家碛乡-清凉寺乡区域3个储层发育有利区.本研究对临兴地区致密砂岩储层的识别及优选有重要的指导作用,并对鄂尔多斯盆地及相邻区域的致密砂岩气藏勘探具有一定的参考价值.