松辽盆地南部大安地区青山口组一段页岩储层微观孔隙结构

张玥; 汤济广; 胡美玲; 秦德超; 冯涛

doi:10.3969/j.issn.1006-6535.2023.05.008

特种油气藏 >

2023 , Vol. 30 >Issue 5: 58 - 66

DOI: https://doi.org/10.3969/j.issn.1006-6535.2023.05.008

地质勘探

松辽盆地南部大安地区青山口组一段页岩储层微观孔隙结构

张玥 ,
汤济广 ,
胡美玲 ,
秦德超 ,
冯涛

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1.长江大学,湖北武汉 430100;
2.非常规油气省部共建协同创新中心,湖北武汉 430100;
3.中国石油华北油田分公司,河北任丘 062552

张玥(1998—),女,2020年毕业于山西师范大学地理科学专业,现为长江大学地质工程专业在读硕士研究生,主要从事非常规油气地质勘探方面的研究。

收稿日期: 2022-12-19

修回日期: 2023-06-18

网络出版日期: 2023-12-25

基金资助

国家科技重大专项“大型油气田及煤层气开发”子课题“我国含油气盆地深层油气分布规律与资源评价”(2017ZX05008-006);非常规油气省部共建协同创新中心开放基金项目“复杂构造区页岩气双向封闭评价体系构建与保存-逸散模型建立”(UOG2022-16)

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Microscopic Pore Structure of Shale Reservoir in Member 1 of Qingshankou Formation, Daan Area of southern Songliao Basin

Zhang Yue ,
Tang Jiguang ,
Hu Meiling ,
Qin Dechao ,
Feng Tao

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1. Yangtze University, Wuhan, Hubei 430100, China;
2. Cooperative Innovation Center of Unconventional Oil and Gas, Wuhan, Hubei 430100, China;
3. PetroChina North China Oilfield Company, Renqiu, Hebei 062552, China

Received date: 2022-12-19

Revised date: 2023-06-18

Online published: 2023-12-25

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摘要

储层的微观孔隙结构特征是评价页岩储层储集性能、资源丰度和“甜点”的重要因素。针对松辽盆地南部大安地区青一段页岩微观孔隙结构特征不明确的问题,利用氩离子剖光—扫描电镜、高压压汞、恒速压汞、CT扫描和核磁共振等测试方法,联合表征研究区青一段页岩储层储集空间类型、孔喉半径分布、连通性及流体可动性特征。研究结果表明:大安地区青一段页岩储层属于黏土质页岩相及混合质页岩相,平均孔隙度为5.95%,平均渗透率为0.041 6 mD,属于特低孔超低渗、超低孔超低渗致密型及超致密型储集空间。划分出8种储集空间类型,微裂缝、喉道连通了储集空间,改善了储层物性,储层可动流体百分比为27%～47%。结合储层含油性特征,预测研究区I类有利储层面积约为300 km²,Ⅱ类有利储层面积约为650 km²,具有良好的勘探开发前景。研究成果可为研究区页岩储层微观孔隙结构评价提供技术支撑。

关键词： 页岩储层; 青山口组; 微观孔隙结构; 储集空间; 松辽盆地; 大安地区

本文引用格式

张玥 , 汤济广 , 胡美玲 , 秦德超 , 冯涛 . 松辽盆地南部大安地区青山口组一段页岩储层微观孔隙结构[J]. 特种油气藏, 2023 , 30(5) : 58 -66 . DOI: 10.3969/j.issn.1006-6535.2023.05.008

Abstract

The microscopic pore structure characteristics of reservoirs are important factors in evaluating the reservoir performance, resource abundance and "sweet spot" of shale reservoirs. To address the problem of unclear microscopic pore structure characteristics of the shale in Member 1 of Qingshankou Formation, Daan Area of southern Songliao Basin, argon ion polishing and scanning electron microscope, high-pressure mercury injection, constant-speed mercury injection,CT scanning and nuclear magnetic resonance were used to jointly characterize the reservoir space type, pore throat radius distribution, connectivity and fluid mobility of the Member 1 of Qingshankou Formation. The results of the study show that the reservoir in Member 1 of Qingshankou Formation, Daan Area belongs to clay shale facies and mixed shale facies, with an average porosity of 5.95% and an average permeability of 0.041 6 mD, and belongs to extra-low pore ultra-low permeability, ultra-low pore ultra-low permeability tight and ultra-tight reservoir space. Eight types of reservoir space types are divided.Micro-fractures and throats connect the reservoir space, improving the reservoir physical properties, and the percentage of mobile fluid in the reservoir ranges from 27% to 47%. Combined with the oil-bearing characteristics of the reservoir, it is predicted that the area of favorable reservoir of Class I in the study area is about 300 km², and that of Class Ⅱ is about 650 km², which has good prospect of exploration and development. The study results can provide a more accurate scheme for microscopic pore structure evaluation of shale reservoirs in the study area.

Key words： shale reservoir; Qingshankou Formation; microscopic pore structure; reservoir space; Songliao Basin; Daan Area

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