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1.
为了研究宁武盆地山西组过渡相页岩的孔隙特征和影响因素,对宁武盆地山西组过渡相页岩进行了系统采样,并针对性地进行了扫描电镜分析、低温氮吸附实验、TOC含量测试、有机质成熟度（Rmax）测试、全岩矿物X衍射分析和孔隙度测试,探讨了页岩孔隙类型、孔隙特征及影响因素。结果表明:研究区页岩孔隙类型主要以粒间孔、晶间孔、有机质气孔、有机质原生孔、溶蚀孔及裂缝为主,大小以2~50 nm的介孔为主,孔隙形态包括开放的尖壁形孔、平行壁孔、锥型管状孔、墨水瓶孔等;页岩平均孔隙度为3.64%,平均孔径为7.78 nm,BET比表面积平均为11.70m2/g,总孔体积平均为0.022 2 cm3/g,具有较强的储集性和吸附性;页岩孔隙具有分形特征,分形维数为2.61~2.77,分形维数与微孔体积分数表现出良好的正相关性;页岩孔隙发育受TOC含量、成熟度（Rmax）和矿物组成的影响。 相似文献
2.
页岩气的成功勘探开发引发了全球海相页岩研究的热潮, 然而对处于生油窗内的陆相页岩储集性能的研究尚需加强.基于光学薄片、场发射扫描电镜、环境扫描电镜、纳米CT、图像分析、GRI物性、气体吸附等方法对长7段泥页岩储集性能进行系统研究.结果表明: 长7段泥页岩形成于陆相半深湖-深湖环境, 面积为10×104 km2, TOC＞2%, Ro=0.8%~1.0%, HI=124~480 mg/g, 生烃潜力高; 脆性矿物含量为45%~59%, 孔隙度为0.6%~3.8%, 渗透率为0.000 72×10-3~0.002 30×10-3 μm2; 主要发育粒内孔、粒间孔和有机质孔, 以伊蒙混层等粘土矿物粒内孔为主, 有机质孔较少; 孔隙直径为30~200 nm, 孔喉系统连通性中等, 具备储集能力; 伊蒙混层等粘土矿物含量与比孔容相关性优于热演化程度与烃指数等, 表明长7页岩微观孔隙主要受控于成岩作用, 有机质生烃作用对储集空间贡献相对较小; 滞留烃主要以吸附态和游离态存在于黄铁矿晶间孔、伊蒙混层粒内孔、伊利石粒内孔与长石粒间孔. 相似文献
3.
为了研究下扬子地区二叠系大隆组页岩孔隙结构特征,联合扫描电镜、高压压汞、N2/CO2气体吸附实验手段对页岩储层孔隙结构进行了研究。结果表明,研究区二叠系大隆组页岩孔隙类型以有机质孔、粒间孔、粒内孔、溶蚀孔和微裂缝为主;孔隙结构为多峰态-多尺度孔隙并存,微孔-介孔-宏孔都有发育,各个尺度的孔隙对孔容都有所贡献,其中以0.75～1.5 nm的微孔、10～35 nm的介孔及大于100 nm的宏孔为主。通过拟合孔体积、比表面积与埋深、有机碳(TOC)、成熟度(RO)以及矿物含量的相关性发现,微孔表面积与埋深、TOC呈正相关;微介孔体积和表面积均与RO呈负相关;宏孔体积与埋深、TOC、黏土矿物含量呈负相关,与RO呈较正相关;宏孔表面积与埋深成正比,与RO成反比。研究结果说明下扬子地区大隆组页岩孔隙发育主要受控于埋深、TOC、RO、黏土矿物含量等因素。 相似文献
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分形维数可定量表征储层孔隙结构的复杂性,为页岩储层评价提供思路。以热模拟获得的不同热演化阶段的鄂尔多斯盆地长7段页岩为研究对象,应用场发射扫描电镜观察了各演化阶段孔隙变化特征,并通过低温液氮吸附实验,研究各个演化阶段页岩孔隙分形特征,运用FHH模型计算页岩孔隙分形维数,探讨了分形维数与有机碳、矿物成分、孔隙结构参数的关系。研究结果表明:低成熟阶段页岩中纳米级有机质孔发育有限,随着成熟度的增加,在有机质内部开始逐渐发育孔隙,同时黏土矿物颗粒间的有机质也开始分解,出现纳米级层间孔,主要发育墨水瓶状孔和少部分的平行板状孔;孔径峰值主要在2~4 nm和40~50 nm,随着成熟度增加,上述2个孔径段的孔隙相对数量增加,分形维数依次增大,分形维数为2.592~2.717,孔隙非均质性增强。分形维数随着有机碳含量的减少而增加,而与石英、黏土矿物含量相关性不明显;随着成熟度增加,微孔和中孔比例增加,平均孔径减小,孔隙表面越复杂,比表面积和分形维数增加;分形维数与总孔隙体积、微孔体积、中孔体积具有很好的正相关性,而与大孔体积相关性较差。 相似文献
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页岩气储集空间与储层矿物特征关系密切,以四川盆地东缘龙马溪组页岩为研究对象,利用矿物组成、微量元素、地球化学等测试结果,结合低温氮气吸附法和高分辨率成像技术,采用多元统计分析方法,建立了页岩孔容预测方程,并分析孔隙分布特征和影响因素。结果表明,龙马溪组中部和底部页岩组分含量差异较大,生物成因的自生石英发育是龙马溪组底部石英含量高的主要原因;页岩纳米级孔隙以2~5 nm为主,对孔容贡献率介于64.2%~70.1%;建立的页岩组分含量与孔容的预测模型高度显著。脆性矿物孔、黏土矿物片间孔及其粒内孔是富黏土矿物页岩的主要孔隙类型,孔隙呈微缝状,小于2 nm孔隙不发育;有机质含量是富有机质页岩孔容大小的主控因素,有机质孔的面孔率介于8.8%~12.5%;有机质含量及成熟度是小于2 nm微孔发育的主控因素,大于50 nm孔隙的发育则受控于黏土矿物、石英及长石含量。 相似文献
6.
Xiaoyue Gao Luofu Liu Fujie Jiang Ying Wang Fei Xiao Zeying Ren Zhengyang Xiao 《Geological Journal》2016,51(6):936-948
The Jurassic shale is an important source rock for the found gas reservoirs in the Tarim Basin, northwestern China, but has never been researched for shale gas potential. The geological effects on methane adsorption capacity for the gas shale have been investigated in this paper through the geochemical, mineralogical and adsorption analyses on samples from wells and sections. The methane adsorption capacity ranges from 0.58 to 16.57 cm3/g, and the total organic carbon (TOC) content is between 0.5 and 13.5 wt%. The organic maturity measured by Tmax is between 410 °C (immature) and 499 °C (overmature). The methane adsorption capacity of the Jurassic continental shale in the Tarim Basin is affected by many geological factors, including the TOC content, organic matter maturity, mineral composition, surface area and pore size distribution. The TOC content is the most significant factor with a positive effect on the adsorption capacity of the Jurassic shale, and the influence varies piecewise according to the TOC content. The TOC content contributes much more to the methane adsorption capacity of organic‐rich shale samples (TOC content > 0.7 wt%) than to the organic‐lean samples (TOC content < 0.7 wt%). The mineral composition is a secondary factor, and the abundance of clay content has a positive effect on the methane adsorption capacity despite its relatively weaker adsorption ability compared to TOC. The pore size distribution has different effects on surface area and pore volume. Mesopores and micropores provide the major surface area and are mainly derived from TOC and illite, which has a positive influence on the adsorption capacity. Mesopores and macropores offer the major pore volume and are mainly formed by illite, which is the major contributor for pore volume rather than surface area. In addition, the TOC and illite contents of the Jurassic shale in the Tarim Basin are closely related to the origin, maturity and diagenesis evolution of the shale: (1) both TOC and illite content variations are related to the different provenances and depositional environments of shale; (2) the decrease of TOC content with increasing maturity is also partly attributed to hydrocarbon generation; and (3) the increase of illite content with increasing maturity is due to illitization in the diagenesis of shale. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
7.
页岩的微观孔隙结构对页岩气的赋存至关重要,气体吸附法可以较好对页岩的微观孔隙结构进行表征。通过测量丁页1井不同深度样品的矿物含量、RO值和TOC含量,结果表明丁页1井龙马溪组页岩样品的矿物含量比较稳定,有机质成熟度变化不大,均为过成熟。通过低温氮吸附法计算样品的比表面积和微、介孔容积和孔径分布,结果表明：（1）样品的平均孔径为2.8 ~ 4.9 nm,10 nm以下的孔隙提供了大部分的微、介孔容积。微、介孔容积为0.00136 ~ 0.0108 cm3/g,平均0.004 cm3/g,比表面积为2.54 ~ 13.69 m2/g,平均6.68 m2/g;（2）微、介孔容积、比表面积和TOC三者之间有很强的正相关性。通过计算TOC含量为0时的微、介孔容积和比表面积推算无机孔和有机孔之间的比例和其对比表面积的影响,发现有机孔提供了大部分的微、介孔容积,有机孔还是比表面积的主要贡献因素;（3）样品的吸附曲线符合IPUAC分类中的第IV型吸附曲线,样品的脱附曲线反映样品孔隙形态随TOC含量的增加,由楔形孔（不定型孔）变为连通的墨水瓶型孔（狭缝型孔）或墨水瓶型孔。 相似文献
8.
In organic-rich gas shales, clay minerals and organic matter (OM) have significant influences on the origin, preservation, and production of shale gas. Because of the substantial role of nanoscale pores in the generation, storage, and seepage of shale gas, we examined the effects of clay minerals and OM on nanoscale pore distribution characteristics in Lower Paleozoic shale gas reservoirs. Using the Niutitang and Longmaxi shales as examples, we determined the effects of clay minerals and OM on pores through sedimentation experiments. Field emission–scanning electron microscopy combined with low-pressure N2 adsorption of the samples before and after sedimentation showed significant differences in pore location and pore size distribution between the Niutitang and Longmaxi shales. Nanoscale pores mostly existed in OM in the Longmaxi shale and in clay minerals or OM–clay composites in the Niutitang shale. The distribution differences were attributed largely to variability in thermal evolution and tectonic development and might account for the difference in gas-bearing capacity between the Niutitang and Longmaxi reservoirs. In the nanoscale range, mesopores accounted for 61–76% of total nanoscale pore volume. Considerably developed nanoscale pores in OM were distributed in a broad size range in the Longmaxi shale, which led to good pore connectivity and gas production. Numerous narrow pores (i.e., pores?<?20 nm) in OM–clay composites were found in the Niutitang shale, and might account for this shale’s poor pore connectivity and low gas production efficiency. Enhancing the connectivity of the mesopores (especially pores?<?20 nm and those developed in OM–clay composites) might be the key to improving development of the Niutitang shale. The findings provide new insight into the formation and evolutionary mechanism of nanoscale pores developed in OM and clay minerals. 相似文献
9.
渝东南地区是我国页岩气勘探开发的重点地区.以彭水地区彭页1井龙马溪组泥页岩为研究对象,结合钻井资料、全岩分析、薄片观察、扫描电镜、核磁共振与氮气吸附等实验,对页岩岩矿特征、有机地球化学、储层特征与含气性进行系统分析.研究表明：彭页1井龙马溪组泥页岩厚度约80 m,脆性矿物含量高,以石英为主,约占48%,其次为长石与碳酸盐矿物;黏土矿物占29%,以伊利石为主,占黏土矿物总量的65%,与美国Barnett页岩矿物成分及含量相近,有利于后期压裂.该井区页岩有机质类型为II2型,TOC为1%～3%,平均1.84%,成熟度2.5%～4.4%.储集空间多为纳米级—微米级孔隙,有机质孔和粒间孔为主,可见粒内溶蚀孔、微裂隙、黏土矿物层间孔和少量晶间孔,平均孔隙度2.43%,孔径以微小孔为主,介于2～80 nm,渗透率主要集中在0.005～0.01 mD,含气性中等—偏低,解析气量平均1.15 m3/t,饱和吸附量（VL）平均2.56 m3/t,均低于Barnett页岩和焦页1井的含气量,有机质丰度、储层孔隙度是该区页岩含气量的主控因素,其次还受脆性矿物和黏土矿物含量影响. 相似文献
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柴北缘盆地YQ-1井中侏罗统石门沟组泥页岩纳米孔隙特征及影响因素 总被引：1，自引：0，他引：1
柴达木北缘(柴北缘)盆地侏罗纪是典型的陆相湖沼盆地,是目前具有页岩气潜力的盆地之一。本文运用氮气吸附、有机碳含量、有机质成熟度、全岩X衍射分析等方法,对柴北缘鱼卡地区YQ - 1井中侏罗统石门沟组泥页岩的纳米孔隙特征及控制因素进行研究。结果表明,石门沟组泥页岩纳米孔隙结构复杂,根据吸附回线及孔径分布特征可划分为两类,第一类以一端不透气性孔和开放性平行板状狭缝孔为主,孔径主要集中在3～5 nm范围内,呈单峰状分布;第二类则以一端不透气性孔和开放性倾斜板狭缝孔为主,孔径主要分布在3～5 nm和8～14 nm范围内,呈双峰状分布。孔径小于50 nm的微孔和介孔是比表面积和孔体积的主要贡献者;黏土矿物含量与微孔、介孔、总孔体积呈正相关;在较低的成熟度制约下,泥页岩有机质孔隙基本不发育,有机质丰度较高的石门沟组上段H9泥页岩TOC含量与微孔、介孔、总孔体积呈负相关性,有机质丰度较差的下段H8泥页岩TOC含量与孔体积相关性则不甚明显;孔隙结构及孔径分布受沉积环境水动力条件影响;黏土矿物是石门沟组泥页岩纳米孔隙的主要提供者,是孔隙发育的主控因素,TOC含量与沉积环境也会对泥页岩孔隙发育产生一定影响。 相似文献
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黔西北下志留统五峰—龙马溪组是我国南方海相页岩气勘探的重要目的层,其孔隙类型除了与常规储层相似的粒间孔、粒内孔、溶蚀孔等孔隙外,还发育了大量的有机质孔。近年来,越来越多的研究发现,页岩气储层中有机质孔占有十分重要的地位。本次研究中发现页岩岩石样品中占主要体积的孔隙类型是中孔(2 nm～50 nm)占比44.16%～82.39%,其次是微孔(<2 nm)占比8.57%～41.23%,宏孔(>50 nm)最少,占比4.02%～16.41%;从场发射扫描电子显微镜照片中可以看出,许多宏孔、中孔有明显的挤压变形现象,说明岩石经历了较长时间的压实作用,并可能伴随着部分孔隙被其他矿物充填的过程。由回归分析可以看出:总有机碳(TOC)含量强烈影响微孔和中孔的发育和演化,尤其是对中孔的影响明显,TOC与这两种孔隙体积之间都存在着明显的正相关关系;石英对中孔发育有一定影响,但不如前者明显,同时石英与微孔之间存在一定的负相关关系;黏土矿物与中孔发育之间存在负相关关系;Ro与微孔、中孔占总孔隙体积的百分比有着良好的正相关关系,而与宏孔占总孔隙百分比有着良好的负相关关系。 相似文献
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柴达木盆地北缘鱼卡凹陷发育的侏罗系泥页岩是中国北方陆相页岩气勘探的目的层系之一。为进一步明确鱼卡凹陷侏罗系泥页岩地化-储集条件,系统采集了柴页1井泥页岩岩心样品,开展了总有机碳、热解氢指数、镜质体反射率、孔隙度和渗透率、扫描电镜、矿物组成及等温吸附特征实验分析。结果表明,柴页1井中侏罗统大煤沟组泥页岩有机质类型和成熟度利于有机质孔隙发育,较高的总有机碳含量利于页岩气富集;粘土矿物的存在虽然抑制了泥页岩微孔隙的发育,但对其吸附能力有促进作用。鱼卡凹陷具有良好的页岩气生成和储集条件,是页岩气勘探的有利地区。 相似文献
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储层孔隙特征和孔隙结构是影响页岩气赋存与储集的重要因素。为评价海陆过渡相高演化煤系页岩储层性质与页岩气储集性能,应用扫描电子显微镜、高压压汞、低温N2和 CO2气体吸附、微米CT扫描、核磁共振实验方法,对沁水盆地武乡区块上古生界煤系页岩气储层孔隙微观特征和孔隙结构进行了研究。结果表明,沁水盆地武乡区块上古生界煤系页岩样品中发育多种类型微观孔隙,常见粒间孔、粒内孔和微裂缝,有机质孔几乎不发育;武乡区块煤系页岩气储层样品孔隙总孔容分布在0.021 9~0.073 5 mL/g之间,平均值为0.039 9 mL/g,总比表面积主要分布在11.94~46.83 m2/g之间,平均为29.16 m2/g,其中介孔(2~50 nm)和微孔(<2 nm)是煤系页岩气储集的主要载体。煤系页岩中的高配位数孔隙数量越多,相应的孔容和孔比表面积越大,孔隙连通性越好;在孔隙数量和总孔容相差不大的前提下,山西组煤系页岩储层孔隙结构与连通性比太原组煤系页岩稍好。 相似文献
15.
页岩气是重要的非常规天然气资源,主要以游离气与吸附气状态赋存于页岩中,研究和阐明其含量、主控因素和演化规律对于揭示页岩气成藏机理具有重要意义.采用不同条件下页岩高温高压等温吸附实验、FE-EM、CO2吸附、N2吸附、压汞等实验方法综合研究页岩气藏中的游离气与吸附气的主控因素.结果表明,游离气主要受页岩孔隙类型、孔隙结构、储层温度与压力等条件控制;OC、成熟度和水分影响吸附气含量.基于吸附气体积校正、地质模型和数值计算综合表征,五峰-龙马溪组页岩中以游离气为主,其平均含量约为%,吸附气含量约为4%.在抬升阶段,储层温度和压力发生改变,页岩气赋存形式随之变化,游离气减少,吸附气增加. 相似文献
16.
虽然页岩气的勘探已经在北美以及中国取得了突破,但是对页岩中孔隙空间的形成与发育仍然存在较大的争议,页岩中是否存在有效的孔隙,这些孔隙与气体的赋存有何联系都需要解答。本文对不同地区、不同岩石类型以及不同热成熟度的页岩进行微观分析,对比前人的研究,同时结合四川盆地龙马溪组页岩的实际分析数据,将页岩划分为富有机质页岩和含粉砂质泥页岩。富有机质页岩中有机质纳米孔是主要的孔隙类型,同时也是气体聚集与吸附的主要空间,有机质孔隙度与有机质含量、热成熟度密切相关;含粉砂质泥页岩中以粒间、粒内溶蚀孔为主,由于有机质含量较少,因而受热成熟影响很小。对页岩的孔隙形成机理分析发现,富有机质页岩孔隙度与有机质含量呈正相关,特别是与初始有机碳含量密切相关,因此恢复初始有机碳的含量是评价页岩含气量与含气性的关键。在热演化程度较低时（Ro < 0.6%）,页岩中有机质孔隙不发育,页岩几乎不含气;随着热演化程度升高（Ro = 0.8%）,页岩微孔隙发育,此时页岩以吸附气为主;随着热演化程度增大（Ro > 1.2%）,微孔逐渐向中孔和宏观孔转化,总的比表面积减小,页岩中游离气含量开始增加,吸附气含量减少。 相似文献
17.
陆相页岩气储层孔隙发育特征及其主控因素分析:以鄂尔多斯盆地长7段为例 总被引：1，自引：0，他引：1
鄂尔多斯盆地延长组是目前最具页岩气潜力的研究层段之一。本文以该盆地东部长7段为研究对象,运用氮气吸附法及氩离子剖光扫描电镜分析对页岩气储层孔隙结构及孔隙类型进行分析和测定,并结合岩石矿物组分、有机质成熟度以及总有机碳（TOC）质量分数,讨论了孔隙结构和影响因素。结果表明,长7段页岩气储层孔隙结构复杂,根据吸附回线形态可分为2类：Ⅰ类回线主要对应孔径为2.6~4.2 nm的狭缝结构或楔形结构的平行板状孔或微裂缝,具体可分为黏土矿物矿片间孔隙、有机质内狭缝状孔隙及基质微裂隙等类型;Ⅱ类回线主要为分布于2.3~3.1、3.5~3.8、4.3~5.2 nm等多个孔径段的开放型圆筒状孔,包括有机质孔和残余粒间孔。中孔和微孔是总孔体积和比表面积的主要贡献者。w（TOC）是延长组页岩总孔体积及比表面积的主要控制因素,与总孔体积及比表面积均呈正相关关系;镜质体反射率及矿物含量对孔隙发育的控制作用不明显,但黏土矿物对微孔孔容贡献较大,其中伊利石质量分数与BET比表面积及孔容有较好的相关性。 相似文献
18.
为了评价陆相页岩气储层的储集空间和储气能力,以鄂尔多斯盆地延长探区上三叠统延长组长7段、长9段页岩为研究对象,运用电子扫描显微镜、高压压汞、低温CO2和N2气体吸附等实验方法,对陆相页岩气储层孔隙类型特征、孔隙结构及其影响因素进行研究。结果表明：(1)延长探区上三叠统延长组陆相页岩发育多种类型微观孔隙,以粒间孔和粒内孔为主,少量晶间孔和溶蚀孔,有机质孔发育较少,为陆相页岩气赋存提供了储集空间;(2)延长组页岩中介孔(2～50 nm)贡献了其主要的孔容和比表面积,占总孔容的7437%,占总比表面积的6440%,且长9段页岩的总孔容和总比表面积均大于长7段页岩;(3)延长组页岩孔隙结构以狭缝型孔和板状孔为主,孔径主要分布在04～09 nm、3～25 nm和5～200 μm区间段内,延长组页岩平均孔径为853 nm,且长7段页岩平均孔径大于长9段页岩;(4)页岩有机碳含量、有机质成熟度及矿物成分含量共同影响着延长组页岩孔隙的发育,其中矿物成分含量是以介孔孔隙为主的延长组页岩孔隙发育的主控因素,有机碳含量及成熟度的增加主要对页岩中微孔孔隙的发育起到积极作用。 相似文献
19.
A key target of shale gas exploration and production in China is the organic-rich black shale of the Wufeng Formation-Longmaxi Formation in the Sichuan Basin and its periphery. The set of black shale contains abundant graptolites, which are mainly preserved as flattened rhabdosomes with carbonized periderms, is an important organic component of the shale. However, few previous studies had focused on the organic matter (OM) which is derived from graptolite and its pore structure. In particular, the contributions of graptolites to gas generation, storage, and flow have not yet been examined. In this study, focused ion beam-scanning electron microscope (FIB-SEM) was used to investigate the characteristics of the graptolite-derived OM and the micro-nanopores of graptolite periderms. The results suggested that the proportion of OM in the graptolite was between 19.7% and 30.2%, and between 8.9% and 14.4% in the surrounding rock. The total organic carbon (TOC) content of the graptolite was found to be higher than that of the surrounding rock, which indicated that the graptolite played a significant role in the dispersed organic matter. Four types of pores were developed in the graptolite periderm, including organic gas pores, pyrite moulage pores, authigenic quartz moldic pores, and micro-fractures. These well-developed micro-nano pores and fractures had formed an interconnected system within the graptolites which provided storage spaces for shale gas. The stacked layers and large accumulation of graptolites resulted in lamellation fractures openning easily, and provided effective pathways for the gas flow. A few nanoscale gas pores were observed in the graptolite-derived OM, with surface porosity lie in 1.5%–2.4%, and pore diameters of 5–20 nm. The sapropel detritus was determined to be rich in nanometer-sized pores with surface porosity of 3.1%–6.2%, and pore diameters of 20–80 nm. Due to the small amount of hydrocarbon generation of the graptolite, supporting the overlying pressure was difficult, which caused the pores to become compacted or collapsed. 相似文献
20.
ZHANG Xu LIU Chenglin LI Bing WU Linqiang GUI Herong WANG Ziling ZHANG Zhihui LIANG Dexiu 《《地质学报》英文版》2020,94(2):337-351
The Songliao Basin is one of the most important petroliferous basins in northern China. With a recent gradual decline in conventional oil production in the basin, the exploration and development of unconventional resources are becoming increasingly urgent. The Qingshankou Formation consists of typical Upper Cretaceous continental strata, and represents a promising and practical replacement resource for shale oil in the Songliao Basin. Previous studies have shown that low-mature to mature Qingshankou shale mainly preserves type Ⅰ and type Ⅱ1 organic matter, with relatively high total organic carbon(TOC) content. It is estimated that there is a great potential to explore for shale oil resources in the Qingshankou Formation in this basin. However, not enough systematic research has been conducted on pore characteristics and their main controlling factors in this lacustrine shale reservoir. In this study, 19 Qingshankou shales from two wells drilled in the study area were tested and analyzed for mineral composition, pore distribution and feature evolution using Xray diffraction(XRD), scanning electron microscopy(SEM), low-pressure nitrogen gas adsorption(N2-GA), and thermal simulation experiments. The XRD results show that clay, quartz, and feldspar are the dominant mineral constituents of Qingshankou shale. The clay minerals are mostly illite/smectite mixed layers with a mean content of 83.5%, followed by illite, chlorite, and kaolinite. There are abundant deposits of clay-rich shale in the Qingshankou Formation in the study area, within which many mineral and organic matter pores were observed using SEM. Mineral pores contribute the most to shale porosity;specifically, clay mineral pores and carbonate pores comprise most of the mineral pores in the shale. Among the three types of organic matter pores, type B is more dominant the other two. Pores with diameters greater than 10 nm supply the main pore volume;most are half-open slits and wedge-shaped pores. The total pore volume had no obvious linear relationship with TOC content, but had some degree of positive correlation with the content of quartz + feldspar and clay minerals respectively. However, it was negatively correlated with carbonate mineral content. The specific surface area of the pores is negatively related to TOC content, average pore diameter, and carbonate mineral content. Moreover, it had a somewhat positive correlation with clay mineral content and no clear linear relationship with the content of quartz + feldspar. With increases in maturity, there was also an increase in the number of carbonate mineral dissolution pores and organic matter pores, average pore diameter, and pore volume, whereas there was a decrease in specific surface area of the pores. Generally, the Qingshankou shale is at a low-mature to mature stage with a TOC content of more than 1.0%, and could be as thick as 250 m in the study area. Pores with diameters of more than 10 nm are well-developed in the shale. This research illustrates that there are favorable conditions for shale oil occurrence and enrichment in the Qingshankou shale in the study area. 相似文献