马如英, 张健, 王猛,等.沁水盆地海陆过渡相页岩储层微观孔隙特征及含气性特征[J].河南理工大学学报（自然科学版）,2021,40(4):66-77.

MA R Y, ZHANG J, WANG M,et al.Micro-pore characteristics and gas-bearing properties of marine continental transitional shale reservoirs in the Qinshui basin[J].Journal of Henan Polytechnic University(Natural Science) ,2021,40(4):66-77.

沁水盆地海陆过渡相页岩储层微观孔隙特征及含气性特征

马如英1, 张健1, 王猛1,3, 马文鹏1, 赵健光1

1.新疆大学 地质与矿业工程学院，新疆 乌鲁木齐 830046;2.陕西煤田地质项目管理咨询有限公司，陕西 铜川 727000;3.中国矿业大学  资源与地球科学学院，江苏 徐州 221116

摘要:为了更加精细地表征沁水盆地海陆过渡相页岩储层物性特征和含气性特征，以沁水盆地 Y3井山西组和太原组页岩为研究对象，通过有机地球化学测试、扫描电镜（SEM）、X射线衍射、高压压汞和低温氮吸附等试验，并结合等温吸附试验和含气量测试，对Y3井石炭-二叠系页岩储层物性特征和含气性进行评价，结果表明：（1）页岩有机质类型为田型，总有机碳 （TOC）含量较高，其中TOC >1%的样品占84.91% ，经历了较高的热演化史，脆性指数偏低， 均值为40.5% ；（2）页岩孔隙发育，含有较多的有机质孔、粒间孔、粒内孔和微裂隙，部分介孔和宏孔的孔隙分形维数中等偏低，具明显的分形特征；（3）介孔对孔隙表面积和孔体积的贡献大于宏孔，其中，黏土矿物含量与宏孔和介孔孔径不具明显的相关性，但有利于宏孔比孔容、介孔孔体积和BET比表面积的发育，石英不利于宏孔比孔容的发育，且与介孔孔体积和BET比表面呈一定的负相关性；（4）样品最大吸附量较低，其中，TOC和伊利石均有利于气体的吸附， 而高岭石起抑制作用，黏土矿物和石英整体上与兰氏体积不具明显的关系；（5）绝大多数样品的总含气量大于页岩气工业开发的下限值0.5 cm³/g，解吸气量和总含气量与TOC、R₀和高岭石均呈较好的相关性，而伊利石往往抑制气体的解吸，整体上，黏土矿物与解吸气量和总含气量呈负相关性，石英含量与解吸气量和总含气量均呈明显的正相关性，解吸气含量与介孔的BET比表面和比孔容具较好的正相关性。本研究精细表征了页岩储层物性特征、微观孔隙特征和含气性特征及其影响因素，对海陆过渡相页岩气的地质研究及开发具有一定的理论和现实意义。

关键词:沁水盆地;海陆过渡相;页岩储层;微观孔隙特征;含气性

doi:10.16186/j.cnki.1673-9787.2019120015

基金项目:新疆维吾尔自治区自然科学基金资助项目（2018D01C062）

收稿日期:2019/12/05

修回日期:2020/02/05

出版日期:2021/07/15

Micro-pore characteristics and gas-bearing properties of marine continental transitional shale reservoirs in the Qinshui basin

MA Ruying1, ZHANG Jian1, WANG Meng1,3, MA Wenpeng1, ZHAO Jianguang1

1.College of Geology and Mining Engineering， Xinjiang University， Urumqi 830046 ， Xinjiang， China;2.Shaanxi Coalfield Geological Project Management Consulting Co. ， Ltd. ， Tongchuan  727000 ， Shaanxi， China;3.School of Resources and Earth Science， China University of Mining & Technology ，Xuzhou  221116 ， Jiangsu， China

Abstract:In order to more accurately characterize the physical properties and gas-bearing characteristics of the marine continental transitional shale reservoirs in the Qinshui basin， the shale of Shanxi Formation and Taiyuan Formation of Y3 well in Qinshui basin was taken as the research object. Through organic geochemical tests and scanning electron microscopy （ SEM） ， X-ray diffraction experiments， high-pressure mercury intrusion and low- temperature nitrogen adsorption experiments， combined with isothermal adsorption experiments and gas content tests， the physical property characteristics and gas bearing property of Carboniferous Permian shale reservoir in Y3 well were evaluated. The results showed that ： （1） The type of organic matter in shale was type III， and the content of total organic carbon （TOC） was relatively high. Among them， 84. 91% of the samples with TOC > 1 % had experienced high thermal evolution history， and the brittleness index was relatively low with an average of 40.5% ； （2） The pores of shale were well developed and contained many organic matter pores， intergranular pores， intragranular pores and microcracks. The fractal dimensions of some mesopores and macropores were medium and low with obvious fractal characteristics；（3）The contribution of mesopores to pore surface area and pore volume was greater than that of macropores. The clay mineral content had no obvious correlation with macropores and mesopores， but it was conducive to the development of macropore specific pore volume， mesopore volume and BET specific surface area ； quartz was not conducive to the development of macropore specific pore volume， and had a certain negative correlation with mesopore volume and BET specific surface area ； （4） The maximum adsorption capacity of the sample was low. Among which， both the TOC and illite were beneficial to the adsorption of gas， while the kaolinite played an inhibitory role in inhibition ；The clay minerals and quartz had no obvious relationship with Langmuir's volume on the whole ； （5） The total gas content of most samples was higher than the lower limit of shale gas industry development of0.5 cm3/g. The desorption gas and the total gas content were well correlated with the TOC， R₀ and kaolinite， while the illite tended to inhibit gas desorption ；On the whole， the clay minerals were negatively correlated with the desorption gas and total gas content ；The quartz content had a positive correlation with the desorption gas and total gas content ； The desorption gas content had a great positive correlation with the BET specific surface and pore volume of mesopores. This study had characterized the physical properties， micro pore characteristics， gas bearing characteristics and its influencing factors of shale reservoir， which had theoretical and practical significance for the geological research and development of marint continental transitional phase shale gas.

Key words:Qinshui basin;shale reservoir;microscopic pore characteristic;gas content

 沁水盆地海陆过渡相页岩储层微观孔隙特征及含气性特征_马如英.pdf