川东南志留系小河坝组致密砂岩孔隙类型及成因

doi:10.12108/yxyqc.20210402

岩性油气藏 ›› 2021, Vol. 33 ›› Issue (4): 10–19.doi: 10.12108/yxyqc.20210402

川东南志留系小河坝组致密砂岩孔隙类型及成因

张文凯^1,2, 施泽进^1,2, 田亚铭³, 王勇³, 胡修权^1,2, 李文杰^1,

1. 成都理工大学能源学院, 成都 610059;
2. 成都理工大学 "油气藏地质及开发工程" 国家重点实验室, 成都 610059;
3. 成都理工大学地球科学学院, 成都 610059

收稿日期:2020-12-21 修回日期:2021-03-16 出版日期:2021-08-01 发布日期:2021-08-06
第一作者:张文凯(1989-),男,成都理工大学在读博士研究生,研究方向为石油地质与构造地质。地址:(610059)四川省成都市成华区二仙桥东三路1号。Email:zwk2013cdut@163.com
通信作者: 施泽进(1965-),男,博士,教授,从事石油地质学与构造地质学的教学与科研工作。Email:286615079@qq.com。
基金资助:
国家自然科学基金“四川盆地东南部及周缘震旦系—寒武系微生物岩成岩作用与孔隙演化”（编号418721374）资助

Pore types and genesis of tight sandstone of Silurian Xiaoheba Formation in southeastern Sichuan Basin

ZHANG Wenkai^1,2, SHI Zejin^1,2, TIAN Yaming³, WANG Yong³, HU Xiuquan^1,2, LI Wenjie^1,

1. College of Energy Resources, Chengdu University of Technology, Chengdu 610059, China;
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;
3. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China

Received:2020-12-21 Revised:2021-03-16 Online:2021-08-01 Published:2021-08-06

摘要/Abstract

摘要： 为研究川东南地区志留系小河坝组海相致密砂岩储层微观孔隙特征及形成机理，开展了岩石薄片鉴定、阴极发光、电子探针、场发射扫描电镜和高压压汞测试等实验分析。结果表明：①小河坝组致密储层孔隙类型有残余原生粒间孔、粒间溶孔、粒内溶孔、基质孔、晶间孔及微裂缝，其中次生溶孔（粒间溶孔和粒内溶孔）占主导，被溶物质主要为碎屑长石和方解石胶结物；②孔隙发育情况受沉积微相、长石溶蚀作用和下伏烃源岩生烃强度共同影响，离生烃中心越近、长石含量越高的远砂坝砂岩中，次生溶孔最为发育；③双流坝—冷水溪一带微观孔隙最为发育，储层物性相对较好。研究结果为川东南地区致密砂岩气勘探指明了新方向。

关键词: 致密砂岩, 孔隙类型, 长石溶蚀, 小河坝组, 川东南

Abstract: In order to study the micro pore characteristics and formation mechanism of marine tight sandstone reservoirs of Silurian Xiaoheba Formation in southeastern Sichuan Basin,thin section identification,cathodoluminescence,electron probe,field emission scanning electron microscopy and high-pressure mercury injection test were carried out. The results show that：（1）The pore types of tight sandstone reservoirs of Xiaoheba Formation include residual primary intergranular pores,intergranular dissolved pores,intragranular dissolved pores, matrix pores,intercrystalline pores and microfractures. Secondary dissolved pores（intergranular dissolved pores and intragranular dissolved pores）were dominant,which were mainly formed by the dissolution of clastic feldspar and calcite cements.（2）The development of pores is affected by sedimentary microfacies,feldspar dissolution and hydrocarbon generation intensity of underlying source rocks. Within the distal bar sandstones,when the sandstones are closer to the hydrocarbon generation center and higher of feldspar contents,the secondary dissolved pores are the most developed.（3）Micro pores are developed well in Shuangliuba-Lengshuixi area and this area maintains relatively good reservoir properties. The results indicate a new direction for tight sandstone gas exploration in southeast Sichuan Basin.

Key words: tight sandstone, pore types, feldspar dissolution, Xiaoheba Formation, southeastern Sichuan Basin

中图分类号:

TE122.2

张文凯, 施泽进, 田亚铭, 王勇, 胡修权, 李文杰. 川东南志留系小河坝组致密砂岩孔隙类型及成因[J]. 岩性油气藏, 2021, 33(4): 10–19.

ZHANG Wenkai, SHI Zejin, TIAN Yaming, WANG Yong, HU Xiuquan, LI Wenjie. Pore types and genesis of tight sandstone of Silurian Xiaoheba Formation in southeastern Sichuan Basin[J]. Lithologic Reservoirs, 2021, 33(4): 10–19.

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川东南志留系小河坝组致密砂岩孔隙类型及成因

Pore types and genesis of tight sandstone of Silurian Xiaoheba Formation in southeastern Sichuan Basin

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