| 川南地区筇竹寺组页岩微观孔隙结构特征及其影响因素 |
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| 引用本文： | 王哲,李贤庆,祁帅,姚素平,王飞宇.川南地区筇竹寺组页岩微观孔隙结构特征及其影响因素[J].高校地质学报,2018,24(2):273. |
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| 作者姓名： | 王哲 李贤庆 祁帅 姚素平 王飞宇 |
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| 作者单位： | 南京大学地球科学与工程学院;中国矿业大学(北京)煤炭资源与安全开采国家重点实验室;中国矿业大学(北京)地球科学与测绘工程学院;中国石油大学(北京)地球科学学院 |
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| 摘 要： | 页岩微观孔隙结构是影响页岩气储层储集能力的重要因素。为评价川南地区下寒武统筇竹寺组页岩性质,基于井下岩心样品、钻井资料,运用普通扫描电镜和氩离子抛光—场发射扫描电镜观测、Image J2x软件分析、低温CO_2和N_2吸附、高压压汞实验方法,对川南地区筇竹寺组页岩气微观孔隙成因类型、孔隙结构特征及其影响因素进行了研究。研究结果表明,川南地区下寒武统筇竹寺组页岩孔隙度为0.25%~5.80%,平均为2.49%;发育多种成因类型微观孔隙,以粒间孔为主,粒内孔、有机质孔和微裂缝次之,页岩微观孔隙总面孔率为3.58%~5.92%;川南地区筇竹寺组页岩总孔容为(2.86~12.55)×10~(-3)m L/g,总比表面积为2.727~21.992 m~2/g,孔径主要分布于0.30~1.00 nm、2.5~4.7 nm和55~70 nm这三个区间,微孔(2 nm)和介孔(2~50 nm)是筇竹寺组页岩气储集空间的主体,孔隙结构形态主要为圆孔、楔形孔、平板狭缝型孔和混合型孔结构。页岩孔隙度及总比表面积与TOC、脆性矿物含量呈正相关关系,页岩微孔孔容及比表面积与TOC呈正相关关系,页岩孔隙度、总孔容及总比表面积与R0、粘土矿物含量呈负相关关系。
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| 关 键 词： | 页岩气储层 孔隙类型 孔隙结构 筇竹寺组页岩 川南地区 |
Characteristics of Microscopic Pore Structures and Its Influencing Factors of the Qiongzhusi Formation Shales in the Southern Sichuan Basin |
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| WANG Zhe,LI Xianqing,QI Shuai,YAO Suping,WANG Feiyu.Characteristics of Microscopic Pore Structures and Its Influencing Factors of the Qiongzhusi Formation Shales in the Southern Sichuan Basin[J].Geological Journal of China Universities,2018,24(2):273. |
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| Authors: | WANG Zhe LI Xianqing QI Shuai YAO Suping WANG Feiyu |
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| Abstract: | Microscopic pore structures of shale are an important factor influencing the storage capacity of shale gas reservoirs. To
evaluate the reservoir properties of the Lower Cambrian Qiongzhusi Formation shales in the southern Sichuan Basin, we investigate
genetic types of microscopic pores, characteristics of pore structures and its influencing factors in this paper, based on the data from
core and drilling samples. Multiple methods were applied, including scanning electron microscopy, field emission scanning electronmicroscopy with argon ion polishing, image J2x software analysis, low-temperature CO2 and N2 adsorption, and high-pressure mercury
injection experiments. Results show that the porosity of the Qiongzhusi Formation shales ranges from 0.25% to 5.80% with an average
of 2.49%. Multiple genetic types of pores are present in the shales, with the inter-granular pores being dominant and the intra-granular
pores, organic matter pores and micro-cracks being subdominant. The total surface porosity of the microscopic pores in the shales
ranges from 3.58% to 5.92%. The total pore volume of the shales ranges from 2.86×10-3 to 12.55×10-3 mL/g, and the total specific
surface area ranges from 2.727 to 21.992 m2/g. Their pore-size distribution mainly occurs in three ranges: 0.30~1.00 nm, 2.5~4.7 nm
and 55~70 nm. Micropores (<2 nm) and mesopores (2~50 nm) are the main reservoir storage space for shale gas. Types of pore structure
are mainly circular pores, wedge-shaped pores, parallel-plate pores and mixed pores. The porosity and total specific surface area of the
shales show positive correlations with TOC and abundance of brittle minerals. The micropore volume and specific surface area of shales
show positive correlations with TOC. The porosity, total pore volume and specific surface area of shales show negative correlations with
Ro and abundance of clay minerals. |
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| Keywords: | shale gas reservoir pore type pore structure the Qiongzhusi Formation shale Southern Sichuan Basin |
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