Classification and optimization of deep marine shale reservoir facies: A case study of Longmaxi Formation shale in Luzhou block, southern Sichuan Basin

WANG XUEYING; ZHANG KUN; JIANG ZHENXUE; SONG YAN; JIANG LIN; HE XINYANG; LI JING; CHEN LEI; WU SHUAICAI; WANG YUANYUAN

doi:10.13809/j.cnki.cn32-1825/te.2024580

Oil and Gas Exploration | Views : 0 下载量: 19 CSCD: 0 CNKI被引量: 0 Scopus: 0 更多指标

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Classification and optimization of deep marine shale reservoir facies: A case study of Longmaxi Formation shale in Luzhou block, southern Sichuan Basin
Vol. 16, Issue 2, Pages: 301-314(2026)
Received：25 December 2024，

Published：26 March 2026
DOI： 10.13809/j.cnki.cn32-1825/te.2024580
稿件说明：

移动端阅览

王雪莹, 张昆, 姜振学, 等. 深层海相页岩储集相划分及优选: 以川南地区泸州区块龙马溪组页岩为例[J]. 油气藏评价与开发, 2026, 2(16): 301-314. DOI： 10.13809/j.cnki.cn32-1825/te.2024580.

WANG Xueying, ZHANG Kun, JIANG Zhenxue, et al. Classification and optimization of deep marine shale reservoir facies:A case study of Longmaxi Formation shale in Luzhou block, southern Sichuan Basin[J]. Petroleum Reservoir Evaluation and Development, 2026, 2(16): 301-314. DOI： 10.13809/j.cnki.cn32-1825/te.2024580.

摘要

中国南方海相页岩气勘探开发中，传统岩相划分未充分考虑热演化对储集空间的影响，导致高热成熟海相页岩的开发效果欠佳。为此，提出基于热演化程度、有机质含量和矿物成分的储集相划分方法，以提高储层评价的准确性，并优选出优势储集相类型。研究采用薄片观察、扫描电子显微镜（SEM）和多种实验测试，对四川盆地南部下志留统龙马溪组页岩储集相特性进行系统分析，并开展储层综合评价。结果显示，川南龙马溪组页岩储集相主要为过成熟富有机质硅质页岩（OR-S）和过成熟富有机质混合质页岩（OR-M）。纵向上，储集相自下而上呈过成熟富有机质硅质页岩向过成熟富有机质混合质页岩的过渡趋势；横向上，储集相非均质性显著，南西至北东方向硅质矿物含量逐渐降低，表现为过成熟富有机质硅质页岩向过成熟富有机质混合质页岩和过成熟富有机质黏土质页岩（OR-A）的过渡特征。通过灰色关联度分析法，建立储集相指数分级标准，选取总有机碳（TOC）含量、含气量、孔隙度、储集相厚度比、硅质矿物含量及黏土矿物含量作为关键评价指标，确定过成熟富有机质硅质页岩为最优储集相。该储集相具有“热演化程度适中、TOC含量高、含气量高、孔隙度大、硅质矿物含量高、储集相厚度大”的特征，表现出优越的储层性能。

Abstract

In the exploration and development of marine shale gas in southern China

traditional lithofacies classification does not fully account for the effect of thermal maturity on reservoir space

resulting in suboptimal development of thermally mature marine shales. Therefore

a reservoir facies classification method based on thermal maturity

organic matter content

and mineral composition was proposed to improve the accuracy of reservoir evaluation and identify optimal reservoir facies types. Thin section observation

scanning electron microscopy (SEM)

and various experimental tests were conducted to systematically analyze the reservoir facies characteristics of the Lower Silurian Longmaxi Formation shale in the southern Sichuan Basin

and a comprehensive reservoir evaluation was conducted. The research results showed that the reservoir facies of the Longmaxi Formation shale in southern Sichuan were mainly overmature organic-rich siliceous shale (OR-S) and overmature organic-rich mixed shale (OR-M). Vertically

the reservoir facies showed a transition from overmature organic-rich siliceous shale (OR-S) at the bottom to overmature organic-rich mixed shale (OR-M) at the top. Laterally

the reservoir facies exhibited significant heterogeneity

and the siliceous mineral content gradually decreased from southwest to northeast

showing a transition from overmature organic-rich siliceous shale (OR-S) to overmature organic-rich mixed shale (OR-M) and overmature organic-rich argillaceous shale (OR-A). Through grey correlation analysis

a reservoir facies index grading standard was established. Total organic carbon (TOC) content

gas content

porosity

reservoir facies thickness ratio

siliceous mineral content

and clay mineral content were selected as key evaluation indicators

identifying overmature organic-rich siliceous shale (OR-S) as the optimal reservoir facies. This reservoir facies is characterized by moderate thermal maturity

high TOC content

high gas content

large porosity

high siliceous mineral content

and large reservoir facies thickness

exhibiting superior reservoir performance.

关键词

Keywords

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