川南地区龙马溪组中深层与深层页岩孔隙结构对比研究

白立勋; 高之业; 魏维航; 杨弼鼎

doi:10.3969/j.issn.1006-6535.2023.04.007

特种油气藏 >

2023 , Vol. 30 >Issue 4: 54 - 62

DOI: https://doi.org/10.3969/j.issn.1006-6535.2023.04.007

地质勘探

川南地区龙马溪组中深层与深层页岩孔隙结构对比研究

白立勋 ,
高之业 ,
魏维航 ,
杨弼鼎

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1.油气资源与工程全国重点实验室,北京 102249;
2.中国石油大学北京,北京 102249

白立勋(2001—),男,2021年毕业于河北工程大学地理信息科学专业,现为中国石油大学(北京)地质工程专业在读硕士研究生,主要从事非常规油气地质研究工作。

收稿日期: 2022-10-14

修回日期: 2023-04-27

网络出版日期: 2023-09-18

基金资助

国家自然科学基金“页岩储层孔隙结构演化及其润湿性对流体运移的影响”(41972145)

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A Comparative Study Of the Pore Structure of Deep-Medium Shale in the Longmaxi Formation of the Southern Sichuan Basin

Bai Lixun ,
Gao Zhiye ,
Wei Weihang ,
Yang Biding

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1. National Key Laboratory of Petroleum Resources and Engineering, Beijing 102249, China;
2. China University of Petroleum (Beijing), Beijing 102249, China

Received date: 2022-10-14

Revised date: 2023-04-27

Online published: 2023-09-18

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摘要

页岩气勘探方向已由中深层页岩向深层页岩逐渐转变,但中深层、深层页岩孔隙结构特征差异不清,控制因素不明,制约了对深层页岩气成储成藏机理的认识。为此,基于场发射扫描电镜、高压压汞、氮气吸附实验及有机地球化学参数,对川南长宁、丁山地区的龙马溪组中深层、深层页岩的地质特征、岩石特征和孔隙结构等进行对比研究。研究表明:川南地区中深层和深层页岩样品的碳酸盐岩矿物和石英含量差异较大,黏土矿物含量均较高;长宁地区中深层页岩有机质均匀发育,但孔隙较小,溶蚀孔与粒间孔较发育,而丁山地区深层页岩原生粒间孔与有机质孔较为发育且有机质孔隙较大;长宁地区中深层页岩的孔体积与比表面积主要由微孔贡献,而丁山地区深层页岩的孔体积与比表面积主要由中孔和宏孔贡献;沉积环境不同造成矿物组分的差异是导致2套页岩孔隙结构差异的主要因素之一。研究成果对深化深层页岩成储机制具有重要意义。

关键词： 中深层、深层页岩; 孔隙结构特征; 差异化控制因素; 龙马溪组; 川南地区

本文引用格式

白立勋 , 高之业 , 魏维航 , 杨弼鼎 . 川南地区龙马溪组中深层与深层页岩孔隙结构对比研究[J]. 特种油气藏, 2023 , 30(4) : 54 -62 . DOI: 10.3969/j.issn.1006-6535.2023.04.007

Abstract

The direction of shale gas exploration has gradually changed from medium-deep shale to deep shale, but the unclear differences in the pore structure characteristics of medium-deep to deep shales and the unknown controlling factors have restricted the understanding of the reservoir formation and accumulation mechanism of deep shale gas. To this end, a comparative study of geological characteristics, rock characteristics and pore structure of the medium-deep to deep shales of the Longmaxi Formation in the Changning and Dingshan areas of southern Sichuan Basin was conducted on the basis of field emission scanning electron microscopy (SEM), high-pressure mercury injection, nitrogen adsorption experiments and organic geochemical parameters. The study shows that: The differences in carbonate minerals and quartz content between the medium-deep and deep shale samples in the southern Sichuan Basin are relatively large, and the medium-deep and deep shale samples both have higher clay mineral contents; the organic matter of the medium-deep shale in Changning area is uniformly developed but with small pores, and the dissolution pores and intergranular pores are more developed, whereas the primary intergranular pores and organic matter pores of the deep shale in Dingshan area are more developed, and the organic matter pores are larger; the pore volume and specific surface area of the medium-deep shale in Changning area are mainly contributed by micropores, whereas the pore volume and specific surface area of the deep shale in Dingshan area are mainly contributed by mesopores and macropores; the differences in mineral components caused by different depositional environments are one of the main factors resulting in the differences in the pore structure of the 2 sets of shales. The research results are of great significance for further understanding of the reservoir formation mechanism of deep shales.

Key words： medium-deep and deep shale; pore structure characteristics; differentiation controlling factors; Longmaxi Formation; southern Sichuan Basin

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