天然气在21世纪中叶将迈入“鼎盛期”，“天然气时代”正在到来。回顾全球天然气工业历程，梳理美国页岩革命启示，总结中国天然气发展历史与成果进展，分析天然气在能源绿色低碳转型中的地位与挑战，提出当前和未来中国天然气工业的发展对策。中国天然气工业经历了起步、增长、跨越3个发展阶段，已成为世界第4大天然气生产国与第3大消费国；天然气勘探开发理论技术取得重大成就，为储量产量规模增长提供了重要支撑。碳中和目标下，推动绿色可持续发展，天然气工业发展挑战与机遇并存。天然气低碳优势显著，“气电调峰”助力新能源发展；同时，开采难度与成本加大等问题更突出。为保障国家能源安全，实现经济社会与生态环境和谐共生，碳中和进程中，立足“统筹布局、科技创新；多能互补、多元融合；灵活高效、优化升级”，完善产供储销体系建设，加速推动天然气工业发展：①加大天然气勘探开发力度，规划部署重点勘探开发领域，突破关键理论，强化技术攻关，持续支撑增储上产；②推进天然气绿色创新发展，突破新技术，拓展新领域，融合新能源；③优化天然气供需转型升级，加大管道气、液化天然气布局和地下储气库建设，建立储备体系，提升应急调节能力和天然气一次能源消费比例，助力能源消费结构转型，实现资源利用低碳化、能源消费清洁化。

基于钻井、录井、测井、地质实验等基础资料，对四川盆地北部二叠系大隆组海相页岩地质特征及页岩气富集高产因素开展研究。结果表明：①大隆组优质页岩形成于二叠系吴家坪组沉积后，主要发育在四川盆地北部开江—梁平海槽内，深水陆棚沉积相和硅质生物繁盛的深水还原环境形成了富有机质的黑色硅质页岩。②大隆组页岩有机质孔与无机质孔发育，脆塑性矿物交互成层，4 500 m以深的超深层依然发育大量无机质孔，总孔隙度大于5%，显著拓展了页岩气储集空间。③大隆组顶底板灰岩既有助于早期埋藏生烃持续处在封闭系统，又为页岩段持续生烃和富气保存提供有利条件，在后期改造中利于缝网横向延伸，达到最优改造效果，提高井控资源量。综合地质、工程、经济条件，优选出5 500 m以浅的有利区面积为1 800 km²，资源量达5 400×10⁸ m³。④大隆组页岩储层具有“薄而肥”的特征，埋深5 500 m以浅的川东高陡构造区内远离主体断裂的向斜区，是当前工程技术条件下最有利的二叠系页岩气建产区域，主要包括南雅向斜、檀木场向斜和梁平向斜。

利用全岩 X 射线衍射（XRD）、场发射扫描电镜（FE-SEM）、核磁共振（NMR）和低温氮气吸附实验方法多尺度定性-定量表征黔北凤冈地区永凤 1 井下寒武统牛蹄塘组页岩孔隙结构特征，并探讨其影响因素与油气地质意义。研究结果表明：①黔北凤冈地区下寒武统牛蹄塘组页岩矿物组成以石英、长石与黏土矿物为主，其次为碳酸盐矿物与黄铁矿；孔隙类型主要为有机质孔、粒间孔、粒内孔与微裂缝，有机质孔与黏土矿物粒间孔最为发育。②研究区牛蹄塘组页岩比表面积平均值为 9.536 6 m²/g，总孔体积平均值为 0.009 02 cm³/g，介孔体积平均值为 0.007 95 cm³/g，宏孔体积为 0.000 37～0.004 58 cm³/g，平均为 0.001 07 cm³/g，平均孔径为 3.381～5.947 nm，介孔最为发育。页岩孔体积主要由介孔与宏孔贡献，比表面积主要由微孔与介孔贡献，微孔与介孔、宏孔连通性相对较差，介孔与宏孔连通性较好，孔隙形态主要为墨水瓶形、圆柱形和裂缝形。③研究区牛蹄塘组孔隙结构主要受 TOC、黏土矿物与脆性矿物影响，TOC 与黏土矿物对比表面积、总孔体积、介孔体积及孔隙度具有积极影响，脆性矿物则对比表面积、孔隙度、介孔体积具有消极影响。

Using whole rock X-ray diffraction（XRD），field emission scanning electron microscopy（FE-SEM） nuclear magnetic resonance（NMR），and low-temperature nitrogen adsorption experimental methods，multi-scale qualitative and quantitative characterization of the pore structure characteristics of shale of Cambrian Niutitang Formation of well Yongfeng 1 in Fenggang area of northern Guizhou was carried out，and its influencing factors and oil and gas geological significance were discussed. The results show that：（1）The shale minerals of Lower Cambrian Niutitang Formation in Fenggang area of northern Guizhou are mainly composed of quartz，feldspar and clay minerals，followed by carbonate minerals and pyrite. The pore types are mainly organic matter pores，intergranular pores，intragranular pores and micro-cracks，with organic matter pores and clay mineral intergranular pores being the most developed.（2）The average specific surface area of the shale of Niutitang Formation in the study area is 9.536 6 m²/g. The average total pore volume is 0.009 02 cm³/g，the average mesopore volume is 0.007 95 cm³/g，the macropore volume is 0.000 37-0.004 58 cm³/g，with an average value of 0.001 07 cm³/g，and the average pore size is 3.381-5.947 nm. The mesopores are the most developed. The pore volume of shale is mainly contributed by mesopores and macropores，and the specific surface area is mainly contributed by micropores and mesopores. The connectivity between micropores and mesopores and macropores is relatively poor， and the connectivity between mesopores and macropores is good. The pore shapes are mainly ink-bottle shaped， cylindrical shaped，and fracture shaped.（3）<i>TOC</i>，clay minerals and brittle minerals are the main factors controlling the pore structure of shale of Niutitang Formation in the study area. <i>TOC</i> and clay minerals have positive effects on specific surface area，total pore volume，mesopore volume and porosity，while brittle minerals have negative effects on specific surface area，porosity and mesopore volume.

基于四川盆地上奥陶统五峰组&#x02014;下志留统龙马溪组富有机质页岩分布规律、优质页岩表观特征、页岩储集层微观特征、保存条件与页岩气富集、可压裂性等方面的分析,对中国页岩气勘探开发理论认识进行总结,并对未来中国页岩气勘探开发提出针对性建议。四川盆地五峰组&#x02014;龙马溪组页岩气重要的地质认识可总结为以下几个方面：沉积环境和沉积过程控制了富有机质页岩分布;&#x0201c;甜点段&#x0201d;优质页岩具备高有机碳含量、高脆性、高孔隙度、高含气性的特征;有机质孔隙是页岩气富集的重要储集空间;保存条件是复杂构造区页岩气地质评价的关键因素;页岩气属&#x0201c;人工气藏&#x0201d;,可压裂性评价是获得高产的核心;纳米级储集空间与赋存状态决定了页岩气具有特殊的渗流特征。对中国页岩气产业的发展建议：①加大基础研究,实现页岩气地质理论体系的新突破;②强化勘探实践,形成多层系全方位新发现;③研究开发生产规律,建立页岩气开发新模式;④创新思维,攻关新技术;⑤探索管理创新,形成页岩气发展新机制。图6参72

Through detailed analyses of the distribution characteristics of organic-rich shale, appearance features of high-quality shale, microscopic characteristics of shale reservoir rocks, fracturabilities, and the relationship between preservation conditions and shale gas enrichment in Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation in Sichuan Basin, theoretical understandings and specific suggestions with respect to the exploration and development of shale gas in China are summarized and proposed respectively. Successful experiences in the exploration and development of shale gas of the Wufeng Formation-Longmaxi Formation in the Sichuan Basin can be summarized into the following aspects: depositional environment and depositional process control the distribution of organic-rich shale; high quality shale in &#x0201c;sweet spot segments&#x0201d; are commonly characterized by high content of organic carbon, high brittleness, high porosity and gas content; organic pores are important storage space for the enrichment of shale gas; preservation conditions are the key factor for the geological evaluation of shale gas in structurally complex regions; shale gas can be considered as &#x0201c;artificial gas reservoirs&#x0201d; and the fracturability assessment is essential for high-production; nanoscale storage space and the mode of occurrence control the special seepage characteristics of shale gas. The following suggestions are proposed for the development of China&#x02019;s shale gas industry: (1) focus more on fundamental research to achieve new breakthrough in the geological theory of shale gas; (2) emphasize exploration practices to have all-round discoveries in multiple strata; (3) study the regularities of development and production to establish new models of shale gas development; (4) think creatively to invent new technologies to tackle key problems; (5) explore the management innovation to create new mechanisms in shale gas development.

以美国印第安纳州伊利诺伊盆地的New Albany页岩(热成熟度R_O值范围为0.35%~1.41%)为研究对象，分别采用氮气吸附法和二氧化碳吸附法表征页岩纳米孔隙结构特点，研究了页岩微观孔隙随热成熟度、总有机碳含量(TOC)及无机矿物组分的演化特征，并探索了页岩孔隙分形特征的热演化规律及其与孔隙结构参数的相关关系。结果表明，随着热成熟度的升高，页岩孔容呈现非单调演化趋势，推测其与有机质的初次和二次裂解密切相关。Frenkel-Halsey-Hill(FHH)方法和热力学模型计算获得的页岩样品的孔隙分形维数在2.47~2.61之间，表明了页岩孔隙具有明显的分形特征。研究还发现，生油窗内成熟页岩样品的孔隙分形维数与其孔容显著正相关，而与孔径显著负相关，暗示孔隙分形维数与页岩气体吸附能力密切相关。更高的分形维数使得孔隙结构趋于复杂，并有利于气体吸附存储。因此，页岩孔隙分形维数可作为定量表征孔隙结构非均质性、评价页岩气体吸附存储能力的重要参数之一。

This study employed low pressure gas adsorption porosimetry to investigate the evolution of meso-and micro-pores in a suite of 11 New Albany shale samples(the Illinois Basin,Devonian/Mississippian,U.S.)across a wide range of thermal maturity corresponding to vitrinite reflection Ro values from 0.35% to 1.41%.Meso-and micro-pore volumes follow a nonlinear evolutionary path with thermal maturity,which is constricted by the transformation of kerogen during the early mature stage and secondary cracking of bitumen/oil at the late mature stage.Fractal dimensions of pore walls derived from Frenkel-Halsey-Hill(FHH)and thermodynamic models range from 2.47-2.61,indicating that pores in shales express fractal characteristics in terms of shape and size.This study also finds the fractal dimension of pore walls to be positively correlated with meso-and micro-pore volumes,and negatively related to average pore size in shale,with only the least mature and the two most mature samples behaving as outliers.Enhanced fractal dimension leads to growing pore wall heterogeneity and increasing adsorption sites and gas adsorption capacity of shale.Therefore,the fractal dimension of pore walls may serve as a quantification indicator of pore heterogeneity and thus a valuable predictor for the gas adsorption capacity of shale.

以氮气分子为探测介质，采用氮气吸附分形分析方法研究了页岩孔隙结构及其不规则性，计算了页岩纳米孔隙分形维数，给出了分形维数与有机碳含量、页岩组成、孔隙结构参数之间的关系曲线，讨论了分形维数对气体吸附和渗流的影响。结果表明，页岩纳米孔隙具有明显的分形特征。分形维数与有机碳含量、微孔发育程度有关。有机碳含量越高，分形维数越大。分形维数反映了页岩微孔的发育程度，微孔越发育，平均孔径越小，比表面积越大，分形维数越大。分形维数对气体的赋存和运移有着不同的影响，分形维数越大，孔隙结构趋于复杂，这有利于气体吸附存储，但不利于气体渗流。

<p>Abundant nanopores are present in shales,and the nanopore structure plays an important role on gas adsorption and migration.Taking nitrogen molecular as probe medium,we use the nitrogen adsorption fractal analysis method to measure the pore structures and roughness in shales.The fractal dimension was obtained from the nitrogen adsorption isotherm using the Frenkel-Halsey-Hill equation.The relationship between shale composition,organic matter content,pore structure parameters and fractal dimension were plotted.The impact of fractal dimension on gas adsorption and transportation was also discussed.Results show that the pore structure in shales is fractal,and the fractal dimension is related to organic matter and micropores.The more enriched organic matter and developed micropore are associated with the much bigger fractal dimension.The degree of fractal dimension indicates the micropore development.The smaller the average pore diameter,the larger the specific surface area,and the higher the fractal dimension.Fractal dimension increases with the increasing micropores.The higher the fractal dimension,the more complicated of pore structure,which is favorable for gas adsorption rather than gas transportation.</p><p>&nbsp;</p>

采用压汞测试、低温氮吸附实验方法开展了腐泥煤孔隙特征研究。根据压汞数据分析了不同成熟度腐泥煤的孔隙结构发育情况，揭示了随成熟度增高腐泥煤孔隙结构的变化规律。发现在无烟煤阶段之前，腐泥煤的孔隙结构以微孔、小孔居多;至无烟煤阶段，微孔、小孔比例降低，大孔、中孔含量增加。与同煤阶腐殖煤相比，腐泥煤整体孔隙度较低，且孔径偏小，大孔不太发育。低温氮吸附实验显示，腐泥煤中孔径3.6nm和1.5nm的2种孔隙特别发育，呈现明显峰值，其他孔径孔隙分布较少;液氮吸附滞后回环分析表明，腐泥煤的微孔、小孔形态多样，主要为一端封闭的不透气孔、墨水瓶型孔、平行板状狭缝孔、倾斜板状狭缝孔。上述腐泥煤孔隙结构特征研究成果，对于同样以腐泥型有机质为主的页岩气储层孔隙结构研究具有重要参考价值。&nbsp;

Mercury injection and low temperature liquid nitrogen adsorption experiments were carried out to examine pore structures of the sapropelic coal in this paper.The results of mercury injection demonstrated the pore structure of sapropelic coal with different maturity and revealed the pore change regulation with maturity.Micropore is dominant during the stage before anthracite,while macropore and mesopore are dominant during the peranthracite stage.Compared to the humic coal of the same maturity,the sapropel ic coal has relatively lower porosity and smaller pore size.Furthermore,it is found that micropore with diameter of 1.5nm and 3.6nm are the most dominant.Adsorption hysteresis loop demonstrates the morphological diversity of the micropore,which mainly dominated by airtight pore with one end closed,ink-bottle pore,parallel plate slit pore and inclined slit pore.These findings have great significance on the understanding of physical property of the shale reservoir that is also mainly composed of sapropelic organic matter.

综合利用地震、钻井、测井及岩心分析化验资料，分析了四川盆地西南缘天宫堂构造奥陶系五峰组—志留系龙马溪组的构造、沉积、储层及可改造性等基本地质特征，探讨了页岩气富集主控因素及成藏模式。研究结果表明：①天宫堂构造优质页岩集中分布在五峰组—龙马溪组龙一₁亚段，Ⅰ类储层主要发育于龙一₁¹—龙一₁³小层，厚度为0.8~17.0 m，具典型的高TOC含量、含气性好、高脆性矿物的特征。②天宫堂构造经历了晚白垩世前快速沉降、深埋藏和大量排烃阶段，形成早期富集型超压页岩气藏；晚白垩世后经2期抬升改造，早期富集型超压页岩气藏逐步向高压—常压页岩气藏调整。③研究区保存条件受地层倾角与宫1号断层的影响，造成不同构造部位页岩气差异富集。④研究区为“早期深埋藏促富集，后期隆升调富集、保存条件控富集”的背斜构造型成藏模式，构造南西翼是下步页岩气勘探开发的潜在有利区。

The data of seismic, drilling, logging and core analysis and test were comprehensively used to study the structure, deposition and basic reservoir geological characteristics of Ordovician Wufeng-Silurian Longmaxi Formation in Tiangongtang structure in southwestern margin of Sichuan Basin, and the main controlling factors of shale gas enrichment and accumulation model were discussed. The results show that:(1) The high-quality shale in Tiangongtang structure is mainly developed in O₃w-S₁l_1-1. Type Ⅰ reservoir is mainly developed in S₁l_1-1-1-S₁l_1-1-3 layers, with a thickness of 0.8-17.0 m, and characterized by high <i>TOC</i> content, good gas-bearing property and highly brittle minerals.(2) Tiangongtang structure has experienced rapid subsidence, deep burial and a large amount of hydrocarbon expulsion before the Late Cretaceous, forming an early enriched overpressure shale gas reservoir. After the Late Cretaceous, it was uplifted and reformed in two phases, and the early enriched overpressure shale gas reservoir gradually transformed to high pressure-normal pressure shale gas reservoir.(3) The preservation conditions of Tiangongtang structure are affected by stratigraphic dip angle and Gong-1 fault, resulting in differential enrichment of shale gas in different structural zones.(4) Tiangongtang structure is an anticline structure-type accumulation model of "early deep burial promotes enrichment, later uplift adjusts enrichment, and preservation conditions control enrichment". The southwest tip of the structure is a potential favorable area for next shale gas exploration and development.

基于等时层序格架,综合钻井和地球物理资料,对四川盆地开江—梁平海槽二叠系—三叠系多期台缘的演化规律进行了研究,探讨了不同时期的台缘类型、礁滩发育模式及展布特征。研究结果表明:①基于龙潭组和吴家坪组同时异相的沉积特征,以最大海泛面和地层旋回一致性为依据,对川中地区和开江—梁平地区的地层界线进行调整,可建立区域等时地层格架。②基于对龙岗地区茅口组—长兴组台缘带的重新刻画,证实开江—梁平海槽在茅口组二段沉积期出现台缘雏形,在吴家坪组沉积期持续发育,长兴组沉积期礁体规模最大,最后在飞仙关组沉积期逐渐消亡;台缘带的演化经历了茅口组沉积期的单斜缓坡模式、吴家坪组沉积期的远端变陡缓坡模式、长兴组沉积期的镶边碳酸盐台地模式。③开江—梁平海槽东、西两侧均有多期台缘叠置的发育特征,海槽西侧发育茅口组、吴家坪组、长兴组3期台缘,海槽东侧主要发育吴家坪组、长兴组2期台缘;根据生物礁的地震反射特征和不同时期生物礁的垂向叠置模式,识别出加积型生物礁和前积型生物礁,并预测了不同类型生物礁的分布规律。④四川盆地在二叠纪—三叠纪形成的多个NW向裂陷均具备形成多期台缘的构造背景,多期台缘叠加的生物礁滩储层是今后四川盆地的一个重要勘探领域。

页岩岩相控制着页岩的生烃潜力、储集性能以及可压裂性。基于岩心观察结果,综合利用岩石薄片鉴定、X射线衍射(XRD)矿物分析、场发射扫描电镜(FE-SEM)成像、X射线荧光光谱(XRF)元素扫描、主量/微量元素测试等技术手段,对四川盆地南部泸州区块龙马溪组一段(龙一段)一亚段上部开发层系(上层系)页岩岩相进行了系统研究。研究结果表明,龙一段一亚段上层系主要发育高TOC含泥硅质页岩(S1)岩相、高TOC硅泥混合页岩(CM1)岩相、中TOC含泥硅质页岩(S2)岩相、中TOC硅泥混合页岩(CM2)岩相、中TOC混合页岩(M2)岩相和低TOC硅泥混合页岩(CM3)岩相6种岩相。其中,S1岩相和CM1岩相为龙一段一亚段上层系"甜点"岩相类型。S1岩相主要发育于龙一段一亚段4小层底部和龙一段一亚段6小层下部,有机质丰度高,有机孔及微裂缝发育,脆性矿物含量高,现场测试其含气量最高,为最优岩相类型;CM1岩相主要发育于龙一段一亚段6小层中—下部,有机质丰度高,黏土矿物晶间孔、有机孔及微裂缝发育,现场测试其含气量较高,为次优岩相类型。海平面升降、火山事件以及上升洋流共同控制着泸州区块龙一段一亚段上层系"甜点"岩相的形成。Ce元素含量异常表明,海平面小幅上升造成底层水中溶解的氧浓度降低,同时火山喷发的火山灰释放大量营养元素,以及上升洋流带来的深海富营养水体,共同促使表层海水中海洋生物生产力提高,形成了一套富有机质的硅质、硅泥混合页岩,并在成岩过程中发育了大量微孔隙和微裂缝。

Lithofacies control the hydrocarbon generation potential, reservoir property and fracturability of shales. Based on core observations, comprehensively using the techniques such as rock thin sections identification, X-ray diffraction mineral analysis, field emission scanning electron microscopy (FE-SEM) imaging, X-ray fluorescence (XRF) element scanning and major element and microelement testing, the study systematically investigates the shale lithofacies of the upper layer series of development in the first submember of Member 1 of Longmaxi Formation (Long1 Member) in Luzhou area of Sichuan Basin. The results show that the study area mainly develops six lithofacies, i.e., high TOC siliceous shale (S1), high TOC siliceous clay mixed shale (CM1), medium TOC siliceous mud shale (S2), medium TOC siliceous clay mixed shale (CM2), medium TOC mixed shale (M2) and low TOC siliceous clay mixed shale (CM3). Among them, S1 and CM1 are the sweet spot lithofacies of the upper layers in the first submember of Long1 Member. S1 lithofacies is mainly developed at the bottom of the fourth layer and the lower part of the sixth layer in the first submember of Long1 Member, characterized with high organic matter, developed organic matter pores and microcracks, high content of brittle minerals, and the highest gas content, which is classified as the optimal lithofacies type. CM1 lithofacies is mainly developed in the middle and lower parts of the sixth layer in the first submember of Long1 Member, characterized with high organic matter, well-developed intergranular pores of clay minerals, organic matter pores and microcracks, as well as high gas content, which is classified as the suboptimal lithofacies type. The formation of sweet spot lithofacies is jointly controlled by sea level changes, volcanism and upwelling ocean currents. Ce anomalies indicate that a slight rise in sea level causes a decrease in dissolved oxygen concentration in the bottom water. Meanwhile, volcanic ashes release a lot of nutrient elements, and the upwelling ocean currents can provide eutrophic water bodies, thus promoting the marine biological productivity in surface sea water, and forming a set of organic-rich siliceous shale and siliceous clay mixed shale. Moreover, a large number of micro pores and micro cracks were developed during the diagenesis process of the shales.

Organic nanopores in shale gas reservoirs are the main storage space for free gas and adsorbed gas and directly affect the occurrence mode and movement of shale gas. In this study, field emission-scanning electron microscopy (FE-SEM), low-pressure gas (N-2 and CO2) adsorption and mercury injection capillary pressure (MICP) analyses were performed and interpreted with statistical and fractal analyses to investigate the organic pore structure in the Upper Ordovician Wufeng shale (O(3)w) and the Lower Silurian lower member of Longmaxi shale (S(1)l). It was found that organic pores in 15 samples from 8 layers of the Wufeng-Longmaxi shale section are usually developed in discrete organic matter particles, organic matter associated with clay minerals and organic matter associated with pyrite framboids. The size, shape and quantity of organic pores vary greatly. The organic pores in Wufeng Formation (layer 1) are densely developed in organic matter particles with relatively small sizes and irregular shapes. The organic pores in the lower part of the lower member of Longmaxi Formation (layers 3, 4 and 5) are less developed and have relatively larger pore sizes with an elliptical shape. In contrast, the organic pores in the upper part of the lower member of Longmaxi Formation (layers 6, 7, 8 and 9) are the least developed, with elliptical shapes and pore sizes in between the two cases above. A higher value of fractal dimension refers a more complex form and this value of whole organic pores with full range of sizes (D-wop) is the largest and followed by organic macropores (D-op (> 50)), organic pores with pore sizes between 4 nm and 50 nm (D-op4.50), and organic pores with pore sizes less than 4 nm (D-op < 4). The fractal dimension of the upper part of the lower member of Longmaxi Formation (layers 6, 7, 8 and 9) is lower than that of both the Wufeng Formation (layer 1) and the lower part of the lower member of Longmaxi Formation (layers 3, 4 and 5). Possible causes leading to pore complexity and heterogeneity include the TOC content, pore size, mineral composition and tectonic effect. Wufeng shale is located at the bottom of Wufeng-Longmaxi shale weakness zone and had experienced more tectonic compression, nappe-slip and reconstruction, which may be the main reason that organic nanopores in Wufeng shale (layer 1) are more complex than other layers.

海陆过渡相页岩气是未来非常规天然气勘探的重要接替领域，开展原位含气性评价及其赋存状态影响因素研究对海陆过渡相页岩气甜点优选具有重要的指导意义。以鄂尔多斯盆地东缘大宁—吉县地区山西组为例，考虑吸附气占据的孔体积，建立了原位页岩含气量校正计算模型，在埋深为1 000~4 000 m范围内，未校正的页岩原位含气量被高估了10.02%~18.79%。海陆过渡相页岩含气性主要受TOC、温度、压力和孔隙空间联合控制。高TOC含量有利于页岩赋存吸附气，高孔隙空间有利于页岩赋存游离气。压力对页岩吸附能力具有促进作用，而温度对页岩吸附能力具有抑制作用，但不同埋深条件下主导因素有所差异。浅层区域，压力的促进作用大于温度的抑制作用；深层区域，温度的抑制作用大于压力的促进作用。基于校正后的原位含气量计算模型，计算了DJ3⁃4井海陆过渡相页岩原位含气量，其含气量高值段分布在山₂ ³亚段的中部，与生产测试结果相吻合。研究结果有效地指导了海陆过渡相页岩气甜点优选。

Marine and continental transitional shale gas is an important replacement field for unconventional gas exploration in the future. In-situ gas evaluation and the study of factors affecting the occurrence state have important guiding significance for the selection of sweet spots of marine and continental transitional shale gas. Taking the Shanxi Formation in Daning–Jixian area， the eastern margin of Ordos Basin as an example， a corrected in-situ shale gas content calculation model is established considering the pore volume occupied by adsorbed gas. In the depth range of 1 000-4 000 m， the in-situ gas content of uncorrected shale is overestimated by 10.02%- 18.79%. The gas bearing properties of marine and continental transitional shale are mainly controlled by total organic carbon（ TOC），temperature， pressure and pore space. High TOC is conducive to adsorbed gas and high pore space is conducive to free gas. Pressure can promote the gas adsorption capacity of shale， while temperature can inhibit it， but the dominant effect is different under different burial depth conditions. In shallow area， the promoting effect of pressure is greater than the inhibiting effect of temperature. In the deep region， the inhibition effect of temperature on gas adsorption is greater than the promotion effect of pressure. Based on the corrected in-situ gas content calculation model， the in-situ gas content of DJ3-4 marine-land transition shale is calculated， and its high gas content section is distributed in the middle of Shan₂ ³ submember， which is consistent with the production test results. The research results can effectively guide the selection of sweet spots of marine and continental transitional shale gas.