Aiming at the local, global and temporal morphological characteristics of faults in seismic profiles, this paper proposes the MCD-ABiLSTM method for fault identification. The method uses multi-channel, convolution kernels of different sizes and convolution of different depths to extract multi-scale seismic profile features, and makes full use of the extracted features to enhance the model’s sensitivity to small faults. By combining Bi-directional Long Short-Term Memory (BiLSTM) with multi-scale dense convolution (MCD), the spatial and temporal characteristics of seismic signals are extracted successively, so that the seismic attribute features can be better represented in space and time. In order to solve the problem of extreme imbalance between label data and background data, an improved Weighted Cross Entropy is adopted as the loss function of MCD-ABiLSTM, which alleviates the imbalance between label data and background data. Then, the label data is expanded to establish a fault label data set suitable for deep learning, which further alleviates the problem of imbalance between fault label data and background data. The comparison results show that compared with FCN, U-net, U-net++ and Deeplap V3, the method proposed in this paper improves the precision by 6.27%, 3.65%, 2.94% and 4%.

Continuous exploration has triggered a heated debate on hydrocarbon resource potential in the southern slope zone of the Kuqa foreland basin, and sources of the Mesozoic-Cenozoic oil and gas have become a key problem to be solved in this region. Composition and organic geochemical parameters of crude oil and natural gas from the southern slope zone of the Kuqa foreland basin were illustrated in order to reveal their origin by using a combination of gas chromatograph (GC), gas chromatogram-mass spectrum (GC-MS) and carbon isotope analyses. The characteristics of crude oil, such as low density, viscosity, solidification point and sulfur content, and high wax content, indicate that source of the crude oil is continental. The biomarker compositions of crude oil are characterized by low to medium molecular weight compounds (n-C12 to n-C20), high Pr/Ph ratios (>1.0), low phytane/n-C18 ratios (0.06–0.54), and predominant regular sterane C29. All biomarker parameters clearly indicate that the crude oil was derived mainly from algae and aquatic plankton and deposited under weak reduction-oxidation environment, and has the characteristics of mixed kerogens. The Cretaceous crude oil was mainly derived from the Triassic lacustrine source rocks, which also contributed to the Paleogene crude oil together with Jurassic coal source rocks. Natural gas is characterized by moderate methane content, high heavy hydrocarbon and nitrogen content, and no hydrogen sulfide. The methane and ethane in Paleogene natural gas are relatively rich in 13C with δ13C1 and δ13C2 values ranging from −37.3‰ to −31.2‰ (mean = −34.25‰) and from −25‰ to −21.3‰ (mean = −23.09‰), respectively, indicating the coal-derived gas from the Middle and Lower Jurassic strata. Hydrocarbon products in the southern slope zone of the Kuqa foreland basin are primarily generated from source rocks in the mature stage. The low-amplitude structural and lithologic traps with the updip pinch-out sand bodies or plugging secondary fault at relatively high tectonic positions are the most favorable areas for discovery and breakthrough in the study area. Results of this study will provide useful information for controlling factors of reservoirs and oil and gas exploration deployment in the southern slope zone of the Kuqa foreland basin.

运移输导体系是远源油气藏的核心内容,是油气实现长距离运移、聚集和成藏的关键纽带.以库车前陆盆地南部斜坡带中—新生界远源油气藏为例,在明确油气时空分布基础上,研究多种输导要素类型及其组合特征,针对不同油气运移输导体系开展2D成藏模拟实验,探讨油气长距离运移输导机理,为区内下步勘探部署提供参考依据.研究表明:库车前陆盆地南部斜坡带中—新生界发育断层、不整合与砂岩层等3类油气输导介质,3类输导介质组合形成了2类油气输导体系:近源坳陷区油源断层—不整合垂向油气输导体系和远源斜坡区不整合—中浅层正断层—砂体横向油气输导体系.近源坳陷区油源断层是关键的垂向油气运移通道,远源斜坡区白垩系/前白垩系、古近系/白垩系不整合面和广泛分布的白垩系—古近系砂岩层为侧向油气运移通道.模拟实验表明油气实现长距离运移、聚集和成藏取决于进入输导层的原油量、圈闭与调节正断层距离、不整合面结构等3个因素:进入输导层的原油量决定了油气运移动力—浮力的大小;圈闭与调节正断层距离决定了油气的优先充注序列,砂体上倾方向的岩性尖灭带或低幅度构造最具成藏优势;具备高孔渗砂岩的不整合结构体具有物性和动力的双重优势,是油气横向运移核心路径.白垩系/前白垩系不整合面分布的非均质性是造成白垩系油气分布差异的重要因素,古近系/白垩系不整合面的广泛分布是区内古近系油气成藏的关键.

库车坳陷南部斜坡带发育中生界—新生界陆相含油气系统,油气资源丰富,是远源油气藏的重点勘探领域,在空间上具有"西富东贫、纵向集中、下油上气、油气并存、以气为主"的分布格局.基于岩心、钻井、孔隙度和渗透率、流体包裹体、油气地球化学等分析测试资料,通过对库车坳陷南部斜坡带中生界—新生界远源油气的成藏条件及富集主控因素进行系统分析,明确了下一步的油气勘探方向.毗邻拜城富油气凹陷、成烃期的稳定斜坡构造、高效的油气输导体系、优越的储-盖组合和持续的油气充注是南部斜坡带形成远源油气藏的关键条件,油气藏总体上呈现"持续供烃、早油晚气、分段捕获、晚期成藏"的成藏特征.油气富集表现为"三元主控",即岩性的上倾尖灭带、构造高部位和断层遮挡带共同控制油气富集,油气主要富集在扇三角洲前缘席状砂或湖相滩坝砂体的上倾尖灭带、倾向朝南的构造高部位和调节断层的遮挡带.研究认识既可以为研究区下一步油气勘探部署提供理论依据,也可以为地质条件相似的构造带开展远源油气藏研究提供借鉴.

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Ultra-deep clastic reservoirs generally have poor physical properties and low single-well productivity, but Well BZ9, which is newly drilled in the Kuqa Depression of Tarim Basin, NW China, encounters a thick high-quality reservoir in the Bashijiqike Formation of Lower Cretaceous deeper than 7600 m and produces a high-yield industrial gas flow. In order to reveal the characteristics and genesis of the Bashijiqike Formation reservoir and reduce the exploration risk of ultra-deep oil and gas layers, we discussed its characteristics, genetic mechanism and oil & gas exploration significance based on cores, well logging and experimental analysis, combined with regional temperature–pressure conditions and burial evolution history. The following research results were obtained. First, the rock types of ultra-deep reservoir of the Bashijiqike Formation in this area are medium- and fine-grained feldspathic litharenite and lithic arkose with point-line contact between grains, and its reservoir space is dominated by primary intergranular pores. At present, it is still at its middle diagenetic stage. Second, different from other ultra-deep fractured low-porosity sandstone reservoirs, this set of ultra-deep reservoir is a pore-type reservoir with porosity of 4–13%, permeability of 0.1–50.0 mD and better porosity and permeability correlation. Third, during the sedimentation of the Bashijiqike Formation, thick sand bodies of delta front were widely developed, medium- and fine-grained sandstones accounted for more than 85% and grains had strong compressive capacity. After that, this reservoir experienced long-term shallow burial during the early–medium stage and rapid deep burial during the late stage, and the burial compaction effect was weaker. During the late stage, a canopy structure was formed from the overlying Paleogene thick gypsum salt bed due to thrust and compression, and it further suppressed vertical compaction. In the meantime, the study area was far from the orogenic belt and the structural transition zone, so the lateral compressive stress was weak. Therefore, the primary intergranular pores were preserved in large quantities. It is concluded that coarse lithology, weak compaction and low tectonic stress are the key factors to the development of this ultra-deep high-quality reservoir. In addition, the development of large-scale effective reservoirs deeper than 7000 m provides favorable material conditions for the high-abundance enrichment of natural gas and the reserves of trillion cubic meters in the Kuqa Depression, and the oil and gas exploration potential is huge.

英买力白垩系舒善河组滩坝薄砂岩是目前塔里木盆地塔北隆起带岩性勘探的有利区和目标储层,薄砂岩储层准确预测是英买力地区勘探成功的关键.通过岩心、测井与地震等资料研究及岩石物理分析建立了滩坝薄砂岩地质模型,模型正演、地震响应特征分析及储层敏感参数优选表明滩坝薄砂岩与均方根振幅及测井伽马呈强相关.利用地震波形横向高分辨率和钻井垂向高分辨率经地震相控波形反演获得滩坝薄砂岩的高分辨伽马数据体,以地震沉积学地层切片技术提取伽马体和振幅体敏感属性地层切片,采用二维颜色融合法融合属性得到表征薄层砂岩空间变异性的融合属性.以融合属性进行薄砂岩刻画,预测了英买力地区2套滩坝薄砂岩储层、7个滩坝单砂体分布,并明确了滩坝单砂体的高部位是有利的钻探位置.

超深层碎屑岩储层物性一般极差,单井油气产能低,但塔里木盆地库车坳陷新近钻探的博孜9井却在7600 m以深的下白垩统巴什基奇克组仍然钻遇了优质厚层储层,并获得了高产工业气流.为了揭示该储层的特征和成因、降低超深层油气勘探的风险,基于岩心、测井和实验分析等资料,结合区域温压条件和储层埋藏演化史,探讨了巴什基奇克组储层的特征、形成机制及其油气勘探意义.研究结果表明:①该区巴什基奇克组超深层储层岩石类型为中、细粒长石岩屑砂岩和岩屑长石砂岩,颗粒呈点一线接触,储集空间以原生粒间孔为主,现今仍处于中成岩演化阶段;②与其他超深层裂缝性低孔砂岩储层不同,该套超深层储层为孔隙型储层,孔隙度介于4％～13％,渗透率介于0.1～50.0 mD,孔渗相关性较好;③巴什基奇克组沉积期广泛发育三角洲前缘厚层砂体,中、细砂岩占比超过85％,颗粒抗压能力强,此后储层经历了早—中期长时间浅埋藏,晚期快速深埋,埋藏压实效应较弱,晚期上覆古近系巨厚膏盐岩层受冲断挤压形成顶蓬构造,进一步抑制垂向压实,同时研究区远离造山带和构造转换带,侧向挤压应力弱,原生粒间孔得以大量保存.结论 认为:粗岩性、弱压实和低构造应力是该套超深层优质储层发育的关键;7000 m以深规模有效储层的发育为库车坳陷天然气高丰度富集和万亿立方米储量规模提供了有利的物质条件,油气勘探潜力巨大.

塔里木盆地塔北隆起西部温宿凸起周缘-英买力隆起地区库姆格列木群底砂岩段是近年来岩性油气藏勘探的热点层位,且玉东1井区已获得了规模的油气产量,但底砂岩段高精度层序地层特征、沉积微相类型及其时空演化规律有待落实.综合利用岩心、钻井、测井和地震资料,识别可以等时追踪对比的标志层、层序界面和湖泛面,构建底砂岩段的高精度层序地层格架,分析各高频层序单元的沉积微相类型和特征,并揭示沉积相的时空演化规律.库姆格列木群底砂岩段为三级层序ESQ1的上升半旋回,可分为4个准层序组,从下到上依次为4砂组、3砂组、2砂组和1砂组.库姆格列木群底砂岩段沉积时期为湖水不断变深、湖盆逐渐扩大的"水进砂退"的沉积背景,发育扇三角洲、辫状河三角洲和湖泊3种沉积相类型,其中4砂组至3砂组沉积时期,为低可容纳空间的低位域体系,物源供给充足,且湖平面上升缓慢,温宿凸起物源区和英买力隆起物源区均发育较大规模的三角洲,英买力隆起物源区还发育规模较大的滨浅湖砂坝.2砂组至1砂组沉积时期,为高可容纳空间的湖侵域体系,湖水迅速变深,温宿凸起物源区沉积物供给迅速减少,扇三角洲迅速向盆地边缘退积迁移,湖水将早期砂体淘洗再沉积形成小型砂坝.英买力隆起物源区三角洲逐渐萎缩,滨浅湖砂坝规模显著变小.

2018年12月,塔里木盆地秋里塔格构造带天然气勘探取得重大突破,中秋1井在下白垩统巴什基奇克组测试获高产工业气流,发现了该构造带迄今为止最大的整装凝析气藏.为了给该构造带下一步油气勘探部署提供依据,在充分利用前人研究成果的基础上,基于岩心、薄片、测井及地球化学分析资料,明确了中秋1大型凝析气藏的油气藏特征和气藏类型,分析了该气藏天然气成藏条件并推演其演化过程.研究结果表明:①中秋1大型气藏属于低含凝析油凝析气藏,天然气为煤成气,主要来自区内侏罗系腐殖型煤系烃源岩;②该构造带能够形成大型油气藏的有利地质条件是三叠系和侏罗系发育的两套巨厚高演化烃源岩、白垩系发育的大型辫状河三角洲规模有效砂岩储层、喜马拉雅晚期以来的构造活动形成的大规模楔状叠瓦构造圈闭、古近系和新近系巨厚膏盐岩形成的优越保存条件,以及油气生成与圈闭形成的良好时空匹配;③该气藏具有先油后气、晚期快速气侵聚集成藏的成藏模式,总体上是一个“早期聚油、晚期气侵、改造调整、快速成藏”的成藏过程.结论 认为,该构造带油气成藏条件优越,具有广阔的油气勘探前景.

塔里木盆地秋里塔格构造带近期取得了天然气勘探的重大突破,但是目前对于埋藏深度较大的下白垩统巴什基奇克组碎屑岩储层的形成机制及控制因素尚不十分清楚.为了给该区下一步的勘探目标优选与油气开发提供技术支撑,基于已获得的钻井、岩心录井、薄片分析等资料,结合测井和生产测试资料,探讨了秋里塔格构造带巴什基奇克组储层的特征及控制因素.研究结果表明:①巴什基奇克组储层岩性以岩屑砂岩为主,次为长石岩屑砂岩,石英、长石含量低,岩屑含量高,成分成熟度低,结构成熟度中等;②储集空间以残余原生粒间孔和粒间溶孔为主,次为裂缝,具有“排驱压力高、孔喉半径小、进汞量小、细孔喉”的孔隙结构特点,属于低孔隙度、低渗透率孔隙型储层;③储层发育受沉积作用、成岩作用、构造作用、巨厚膏盐层分布和埋藏深度的综合影响,其中岩相、溶蚀作用和构造挤压是主要的控制因素,溶蚀作用与构造挤压造缝是储层储集性能得以改善的关键;④储层孔隙的演化模式可划分为早期浅埋粒间孔发育、早成岩期强胶结孔隙缩减、早表生期溶蚀增孔、中成岩期孔隙持续保持、晚期裂缝沟通孔隙改善储层性能等5个演化阶段.

岩层的褶皱弯曲通常会引起层内部各质点的相对差异变位,这为研究挤压构造区应力对储层的控制作用提供了可能.通过对库车前陆冲断带深部区构造高部位某钻井的三轴应力计算,划分应力中和面,分析不同应力性质段的储层响应特征及成因,并探索应力垂向分带性的油气勘探意义.研究结果表明:①库车前陆冲断带地应力的垂向分带对储层影响明显,张性应力段受拉张应力影响,储层发育高角度—近直立天然构造裂缝,天然裂缝具有开度大、延伸长、密度小、充填性低等特征,储层普遍发育原生粒间孔、粒间溶孔、粒内溶孔,物性好,对产量贡献大;②挤压应力段受挤压应力影响,发育多期低角度交织网状裂缝,天然裂缝具有开度小、延伸短、密度大、充填性高等特征,储层孔隙发育较差,主要是一些粒内与粒间微孔隙,物性较差,对产量贡献低;③应力垂向分带性划分可为后期开发井的钻探节约钻井成本,提高钻探效益,并能对新的勘探圈闭进行钻前地质储量评估,指导天然气勘探.应力垂向分带性对前陆冲断带的油气勘探具有重要经济意义.

志留系柯坪塔格组上3亚段是塔里木盆地塔中地区重要的海相碎屑岩勘探层系,综合运用钻井、测井、地震和实验分析资料,对沉积前古地貌、古盐度和水动力条件进行系统分析,进而明确了沉积体系类型和分布规律.研究发现,塔中地区志留系沉积前古地貌由北向南逐渐抬高,局部存在多个狭长低洼区和水下低隆,发育海侵背景下受古地貌控制的潮坪、河口湾和潮汐改造三角洲3种沉积体系,主作用水体类型和能量的差异形成了不同的砂体类型和沉积建造.潮坪沉积体系的砂体类型以潮下带潮汐水道和潮间带沙坪为主,其中潮汐水道具有完整的3层结构,垂直海岸呈条带状分布.河口湾发育水道和沙坝砂体,砂层中常见泥质薄层,砂体轴向与河口湾轴向平行且延伸较远.潮汐改造三角洲发育水下分流河道砂体,见硅质、燧石砾层及大型冲刷面.通过以上研究建立了塔中地区志留系潮坪—河口湾—三角洲沉积模式,并预测了有利砂体的展布.

Fracture is of primary importance to the natural gas production capacity from many tight sandstone reservoirs in the Kuqa foreland basin, NW China, but the orientation, size and plane porosity of the fractures in the subsurface is difficult to measure directly. Terrestrial light detection and ranging (LIDAR) surveys can offer factual information of outcrop-based research efforts to characterize fracture development laws and controlling factors. In this paper, utilizing a multi-level covering, we obtain the three dimensional (3D) point cloud data from a LIDAR survey launched at a typical outcrop. Matching with high-resolution digital photos and artificial measured information, the 3-D positions of natural fractures are extracted strictly in the data volume section. Furthermore, the fracture and reservoir model can be founded based on the systematic sampling and laboratory analysis, while a variety of accurate facture parameters can be obtained. It is founded that three groups of shear fractures are mainly developed in two periods with large inclination, short trace length and small spacing of normal distribution. Its patterns has provided a literal distribution of penetrating fracture zone and interlayer fracture zone with a single and a double set of advantage orientation respectively. It turned out that the fracture development scale is controlled by lithology, layer thickness, maximum principle paleostress and rock composition with a good exponential relationship. Our work could provide a workflow linking outcrop fracture observations to the 3D model of subsurface fracture prediction and extend modeling capability in other outcrop studies.

库车坳陷前陆区白垩系发育特低物性、强非均质性和高稳产砂岩储层,溶蚀作用显著,但成因机制尚不是很明确.利用高温高压热模拟实验还原了目的层在成岩演化过程中1种表生流体和2种埋藏流体环境下溶蚀作用差异,揭示了成岩矿物演化过程及储集空间结构变化特征.结果表明,表生成岩期大气淡水淋滤弱酸性流体环境(CO2饱和溶液,pCO2=1 MPa)溶蚀作用最为显著,长石类矿物发生明显溶蚀,石英和黏土矿物相对难溶,Na+、Ca2+和K+等离子析出明显,Si4+和Al3+析出较少,样品表面沉淀出较多的疑似多边形石英和铝硅酸类矿物;成岩晚期油气充注酸性流体环境(乙酸溶液,2 mL/L)溶蚀作用其次,易于溶解白云石、石膏和长石类矿物,Ca2+、Mg2+、Na+和Si4+等离子析出明显,样品表面无沉淀;成岩早—中期碱性流体环境(NaHCO3溶液,pH=7.46、HCO-3=0.6 mol/L)溶蚀作用相对较弱,石英、长石和部分黏土矿物均发生了不同程度的溶蚀,且随着温度、压力的增加,溶蚀作用程度增加.综合分析表明:表生流体是研究区砂岩储层溶蚀孔隙发育的关键因素,其次为有机酸和碱性埋藏流体.这一认识能够丰富致密砂岩储层孔隙成岩演化理论,为下一步寻找规模储层发育区和气田有效开发提供理论支撑.

The 3rd upper sub-member of the Silurian Kepingtage formation has developed marine clastic sediments and is an important petroleum exploration and development set in Tazhong area, Tarim basin, NW China, of which the sedimentary system and favorable reservoir distribution have been researched in detail based on the drilling, logging, seismic, experimental data and the theory of sequence stratigraphy. The results show that it was overlap and edge away layer by layer from northwest to southeast. On the background of marine transgression, the depositional systems of tidal flat, estuary and tidal reformation delta were developed and controlled by palaeogeomorphology, while different types of sand bodies and sedimentary formations were developed owing to the difference of types and energies of main action water bodies. In the sedimentary system of tidal flat, the main types of sand bodies are subtidal tidal channels which show significantly banded distribution vertical to the coast with a complete three-tier structure. The sand bodies of tidal bars are common in the estuary sedimentary system and extend far parallel to the axis of the estuary with thin layers of mudstone. The sand bodies of underwater distributary channels are developed with upward-finning positive rhythm and large erosion surfaces in the tidal delta sedimentary system and distributed like a bird-foot shape. By above research, the depositional mode of tidal flat-estuary-delta in Tazhong area has been established and the distribution of favorable reservoirs has been predicted.

塔里木盆地北部下白垩统舒善河组是岩性油气藏勘探的潜在领域之一.为了明确舒善河组的古地理背景、有利砂体展布和储层特征,揭示岩性油气藏的勘探潜力,依据露头、钻井、测井和地震资料开展了薄层砂岩刻画与地震属性的综合分析.结果表明:①库车坳陷在舒善河组沉积期为炎热干旱气候,水体为中等盐度、浅水、氧化型湖盆环境,沉积岩的颜色以灰褐色为主.②塔里木盆地北部发育温宿-西秋、新和-齐满、牙哈-提尔根3个古隆起,走向呈近NE-SW向,北翼陡峭,南翼平缓.沉积在古隆起背景之上的舒善河组,早期具有填平补齐、超覆的特征,发育扇三角洲-湖泊体系;中期为最大湖泛期,以湖泊沉积为主;晚期受古隆起高隆带和水下低隆带的控制,在英买力-东河塘地区一带发育湖相砂坝群沉积.③砂坝群呈NE-SW向展布,长140～150 km,宽50～60 km,面积达7 200 km2,砂体累计厚度为10～50m,发育低角度交错层理、沙纹层理、浪成波痕、反粒序等沉积构造,自然伽马测井曲线以漏斗形和齿化箱形为主,地震反射剖面显示砂体呈透镜状、具有叠瓦式侧积的特征.④舒善河组的砂坝现今处于北倾斜坡带,南部有4 km宽的泥岩带封堵,在纵、横向上有断裂和不整合面沟通油气源灶,有利于形成砂岩上倾尖灭型圈闭带.塔里木盆地北部下白垩统舒善河组的有利圈闭面积为800 km2,砂岩厚度为10～25m,具有亿吨级储量潜力,是岩性油气藏效益勘探的最有利区.

库车坳陷前陆区白垩系巴什基奇克组广泛发育扇三角洲前缘砂体,是天然气富集的有利场所.针对大北气田钻井少、井距大的特点,选取与目的层地质特征相似的典型露头剖面,利用三维激光扫描技术对其进行多方位全覆盖扫描和三维数据采集,并与人工实测地质信息和分析化验资料相结合,借助计算机模拟技术建立三维数字化地质模型,有效揭示扇三角洲前缘砂体构型特征.结果表明:研究区扇三角洲前缘砂体构型样式包括不完全叠拼式、侧拼式和孤立式3种,由于构型样式不同,砂体间连通性存在差异;砂体具有多期水下分流河道垂向叠加、大面积连续分布的特点,且河道砂体中、下部物性比底部和上部好,且以均质的中砂岩和细砂岩为最优;伴有少量河口坝和远砂坝微相沉积,砂体厚度和宽度与厚度比具有较好的负相关性;砂岩含量高,砂体间发育稳定的条带状泥岩,砂体间并非完全连通,层内和层间非均质性较强.

PreviousNext No AccessInternational Geophysical Conference, Qingdao, China, 17-20 April 2017High resolution seismic prediction of thin sandstone under gypsum-salt in the YUDONG area of the TABEI upliftAuthors: JiLong ZhaoJunPeng WangQingLu ZengNan HuangJiLong ZhaoHangzhou Research Institute of Petroleum GeologySearch for more papers by this author, JunPeng WangHangzhou Research Institute of Petroleum GeologySearch for more papers by this author, QingLu ZengHangzhou Research Institute of Petroleum GeologySearch for more papers by this author, and Nan HuangChina University of PetroleumSearch for more papers by this authorhttps://doi.org/10.1190/IGC2017-377 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Thin sandstone reservoirs are difficult to be used in seismic prediction and trap detection because of their thin thickness, fast phase change and strong concealment. The key problem lies in the limited resolution of thin reservoirs by seismic data. Since Ricker (1953) made a 1/4-wavelength resolution limit so far a breakthrough in thin-layer research, Widess (1973) defined the resolution limit as 1/8 wavelength by a homogeneous wedge model study. Tirado (2004) discusses the odd-even decomposition of the reflection coefficient sequence for a heterogeneous wedge-shaped model. The resolution of the seismic interpretation can be less than its sampling rate. Domestic scholars Lingyun (2004) that the actual seismic exploration can break through the 1/4 wavelength resolution limit. Zeng et al. (2005) suggested that the resolution of the thin layer can be as much as 1 m, far less than 1/8 wavelength. Seismic prediction of thin layer thickness can be realized from three aspects: time domain, frequency domain and attribute application. Based on petrophysical analysis, high-resolution inversion of geostatistics, seismic multi-attribute information fusion and earthquake Sedimentation and other latest theories and techniques. A prediction study on thin sandstone reservoirs in the Paleogene of Jurassic is carried out. The distribution and depositional evolution of reservoir sandstone are discussed, and a new method for predicting thin sandstone reservoir is formed. Keywords: resolution, Asia, decomposition, reflectionPermalink: https://doi.org/10.1190/IGC2017-377FiguresReferencesRelatedDetails International Geophysical Conference, Qingdao, China, 17-20 April 2017ISSN (online):2159-6832Copyright: 2017 Pages: 1525 publication data© 2017 Published in electronic format with permission by the Society of Exploration Geophysicists and Chinese Geophysical SocietyPublisher:Society of Exploration Geophysicists HistoryPublished Online: 31 May 2017 CITATION INFORMATION JiLong Zhao, JunPeng Wang, QingLu Zeng, and Nan Huang, (2017), "High resolution seismic prediction of thin sandstone under gypsum-salt in the YUDONG area of the TABEI uplift," SEG Global Meeting Abstracts : 1478-1481. https://doi.org/10.1190/IGC2017-377 Plain-Language Summary KeywordsresolutionAsiadecompositionreflectionPDF DownloadLoading ...

塔里木盆地库车坳陷克深气田区白垩系巴什基奇克组是库车山前的主力产气层段,具有埋深大、基质物性差、构造裂缝整体发育的特征.利用钻井取心、FMI成像、钻完井漏失量、试采压力恢复资料,结合CT扫描定量分析、高压压汞、扫描电镜、裂缝充填物测年等实验分析方法,开展了低地震资料品质下的超深层致密砂岩储层裂缝的定量评价与预测.认为克深气田区总体发育3期构造裂缝,以高角度半充填剪切缝为主,有效开启度为50～300μm,主要走向以近SN向为主,见EW走向裂缝;主要受古应力的大小及方向控制,同时受地层原始岩性组构影响;第三期构造裂缝与储层演化配置关系最好,对储层渗透率的提升起到关键作用.裂缝的高渗流区主要分布在背斜高部位、断裂的转折端及次级断裂附近.构造裂缝有效沟通了单砂体,可整体提高储层渗透率1～3个数量级,构造裂缝派生的微裂缝可有效沟通其周围的基质孔喉,沿裂缝网络更易发育次生溶蚀孔隙.