Shallow-water lacustrine delta sand bodies with large areas of high-quality reservoirs are widespread in the first member of Yaojia Formation (k2y1) of the Upper Cretaceous in Qijia–Gulong area, central depression of the Songliao Basin. The analysis of elements affecting reservoir quality has always been a focus and difficulty of oil and gas exploration and development. Seismic profile interpretations, well log analysis, lithological associations, core observations, and heavy mineral assemblage determinations are used to interpret sequence stratigraphic framework and sedimentary evolution of K2y1. The latter is interpreted as a transgressive systems tract comprising three fourth-order sequences (SQ1–SQ3). Based on core observations and wireline logs, K2y1 primarily contained a shallow lake, distal bars, sand sheets, interdistributary bay, and subaqueous distributary channel deposits. The sand ratio and scale of the channels in the formations from SQ1 to SQ3 decreased which was reflecting the continuously retrograding sedimentary evolution of deltas to the lakeshore, as observed based on mutual calibration of single well sedimentary facies and root mean square amplitude attributes. Based on petrographic analysis of thin sections, particle sizes, scanning electron microscope (SEM) as well as X-ray diffraction, the effects of diagenesis and sedimentary facies on reservoir quality are investigated. In the process of delta-front retrogradation, the changes in reservoir quality in different sequences are primarily a result of the following factors: (1) the fine sandstone has better reservoir quality and more primary pores than the siltstone, which has higher argillaceous content. Additionally, in the fine sandstone, more primary pores can be preserved in the compaction process with higher reservoir quality. (2) Less authigenic illites have little influence on reservoir quality. When the authigenic illite content is >6%, the flocculent characteristics of authigenic illite crystals easily separate the intergranular pores into tinier micropores, thereby reducing the reservoir physical properties. (3) More than 3% of Pompon-like authigenic chlorites may occupy the pore throats of sandstone reservoirs. (4) The feldspars and rock fragments in the sandstone reservoir adjacent to the source rock easily form numerous secondary dissolution pores and improve the reservoir quality. The present study reveals that large-areas of subaqueous distributary channel sand bodies with stable lateral distribution, high reservoir quality, and significant petrophysical characteristics are the best-qualities of reservoir within the early stage of retreating delta-front system.

四川盆地地热资源类型多、储量大,可利用总量位居全国第3位,具备地热资源开发利用的基础.为进一步明确盆地的热体制对区域地热能资源评估的作用,根据四川盆地内钻井的基本地热参数与盆地构造演化过程,系统研究了盆地热流分布及主控因素、热储系统类型以及有利地热资源分布.研究结果表明:①四川盆地沉积地层的热结构分为3种,分别为受控于基底热流背景与裂陷槽岩石热导率差异的加里东阶段热结构;受控于峨眉大火成岩省玄武岩喷发及盆地拉张作用的海西阶段热结构;受盆缘强烈造山运动形成的中新生代热结构.②提出了震旦纪—早寒武世与晚二叠世—中三叠世封闭型层控热储系统与开放型断褶热储系统2类、3种热储系统类型.③明确了断裂带深循环地热资源、强构造背景下的异常高温地热资源与早期深埋地热资源3类有利地热资源类型及其优势分布区.结论认为,四川盆地地热资源勘探开发潜力巨大,取得的认识对四川盆地地热资源的勘查与评价具有重要的促进和推动作用.

为明确松辽盆地长垣西部葡萄花油层前缘河道砂体受不同因素影响的发育特征及其差异,根据测井 、岩心等资料,结合多种矿物含量分析交汇,定量识别长垣西部地区受水动力条件、供源成分及方向影响的不同物源交汇范围,根据相对湖平面变化和物源供给等方面的耦合关系,以水下分流河道砂体为骨架,分析不同供源方向沉积成因的砂体岩相组合及发育特征差异.结果表明:松辽盆地长垣西部葡萄花油层发育时期受北部齐齐哈尔水系与西部英台水系两大水系影响,发育两类沉积特征明显不同的浅水三角洲沉积体系,即东北部物源控制的长源缓坡大型浅水三角洲与西部物源控制的短轴陡坡正常三角洲两个沉积体系.不同沉积体系交汇区三角洲前缘砂体可分为曲流型水下分流河道砂体与浅水型水下分流河道砂体两种类型.三角洲水下交汇区自下而上沉积物单层厚度增大,平面上形成大前缘、小湖泊的沉积特征;不同期次、来自不同三角洲的水动力大小、展布形态不同,致使砂体在空间上产生交切、叠置,形成厚度小、分布多、层数多的特点,可成为有利的油气储层.该结果可为研究缓坡浅水三角洲前缘砂体体系提供指导.

With the help of core and logging data, laboratory test data, by using classified evaluation of glutenite based on classification of sedimentation, subdividing the glutenite facies into tractive-current glutenite and gravity- current glutenite. The tractive-current glutenite is mainly a set of fan channel deposits and underwater distributary channel deposits. Gravity-current glutenite is a set of debris flow deposition and debris flow deposition. Predictive results are found to be high accuracy by first time using glutenite logging identification technology, pseudo-sonic wave impedance technique. The result of research shows that the difference of sedimentation and conglomerate is the main factor controlling the reservoir physical properties and productivity in Mabei area. The physical and oily and oil test production are mainly controlled by the sedimentary genesis of the glutenite reservoir and less by diagenesis modification. The results show that the development of tractive-current glutenite in underwater diversion channel and fan-shaped river channel micro- phase get high oil saturation and Good oil test result. The physical and oil-bearing properties of traction glutenite are better than those of gravity glutenite, rich oil layers are mainly the traction glutenite, and poor and none oil layers are mainly gravity glutenite. Therefore, the distribution of glutenite due to the fan-delta underwater distributary channel tractive-current should be a favourable zone for future well location deployment.

哈萨克斯坦库姆萨伊盐上油田侏罗系发育一套曲流河三角洲沉积,为典型的高孔高渗储层.通过岩心观察、粒度分析、扫描电镜、岩石薄片等资料,首次对研究区储层的岩矿特征、物性以及孔隙结构进行了详细研究.研究表明:该区主要储集层岩性的为细砂岩、粉细砂岩,成分成熟度和结构成熟度均较高,呈现出远物源的沉积特征.黏土矿物以伊利石为主,其次为绿泥石和伊/蒙混层.砂岩储层孔隙类型以原生粒间孔为主,其次为次生的溶蚀孔隙,微裂缝少见.喉道类型以粗中孔粗中喉道为主,物性好,孔隙发育.在此基础上,进一步研究饱和度中值压力等影响因素,结合沉积微相、成岩作用等储层成因的主要控制因素,将侏罗系阿阿林阶组(Ю-I)分为Ⅰ、Ⅱ、Ⅲ类储层,巴柔阶组(Ю-Ⅱ)可划分为Ⅱ、Ⅲ类储层,同时通过最新的试油效果,验证了该区有利储层预测的可靠性和可行性,为该地区高孔高渗储层勘探开发提供了扎实的地质理论基础.

Urho formation of the Mabei slope zone in Junggar basin had a stable structure and developed fan delta sedimentary system during the deposition process. Distributary channel and fan River constitute the sedimentary framework Urho formation. The research on diagenesis of Urho reservoir based on a large number of thin section and core analysis is conducted by different means of experiments such as scanning electron microscopy, X-ray diffractions and cathode luminescence, etc. The results show that the influence of diagenesis on the reservoir is duality. The effect of compaction (pressure solution) in the study layer is mainly controlled by the difference of vertical burial. The calcite cementation is mainly formed at the early stage of burial. Since the late-early diagenetic stage to the intermediate diagenetic stage, large scale of acidic dissolution and alteration occurred in Urho formation. Acid dissolution mainly exists in widely developed volcanic rocks and zeolite cements, which greatly reforms the physical properties of the reservoir. Sedimentary diagenesis plays a decisive role in the distribution of oil and gas.

通过岩心、测井、录井、分析化验等资料,对南图尔盖盆地北诺扎里油田中侏罗统DOSHAN组沉积相进行研究,首次在南图尔盖盆地阿雷斯库姆坳陷侏罗系Doshan组(J2ds)中发现一套冲积扇入湖形成的扇三角洲相沉积体,进一步可识别出3个亚相和6个微相,其中水下分流河道和碎屑流微相最为发育.沉积演化规律:随着湖平面缓慢上升,东北及东南两大物源区逐渐向后退却,扇三角洲平原亚相面积逐渐减小,代之以扇三角洲前缘亚相为主.扇三角洲前缘碎屑流及水下分流河道延伸距离亦逐渐变短.扇三角洲前缘中的水下分流河道及河口砂坝砂体物性最好,是最有利的油气储集体,前扇三角洲暗色泥岩可作为重要的烃源岩和盖层.

复兴场—李家台构造圈闭形成于荆沙组-潜江组沉积期，在潜江组层拉张程度控制了沉积厚度，沉积格局。本文分析了江陵凹陷复兴场—李家台构造的六个构造演化阶段，分析了构造对油气运移的控制。

塔里木盆地位于我国西部新疆地区，油气资源十分丰富，盆地属于型克拉通盆地，存有多套烃源岩，主要是发育于寒武系、中上奥陶统、石炭系和三叠-侏罗系，这些烃源岩复合叠置，多期成烃演化和多期成藏，晚期成藏的油气经历的破坏运动较少，因此更值得重视；塔里木盆地中发育有五套储盖组合，是大型特大型油气成藏不可或缺的条件，该盆地油气藏主要是构造油气藏。系统分析盆地的石油地质条件、构造条件和沉积特征，为研究区下步的勘探部署提供可靠依据。