渝东地区龙门坝剖面二叠系吴家坪组二段地质特征

doi:10.3969/j.issn.1006-6535.2025.05.008

特种油气藏 ›› 2024, Vol. 32 ›› Issue (5): 66-75.DOI: 10.3969/j.issn.1006-6535.2025.05.008

渝东地区龙门坝剖面二叠系吴家坪组二段地质特征

陈绵琨¹, 许露露², 姚明君¹, 刘早学², 温雅茹²

1.中国石化江汉油田分公司,湖北武汉 430074;
2.湖北省地质调查院,湖北武汉 430034

收稿日期:2024-04-14 修回日期:2025-07-20 出版日期:2025-09-25 发布日期:2025-10-30
通讯作者: 许露露(1985—),男,高级工程师,2007年毕业于长江大学地球化学专业,2015年毕业于中国地质大学(北京)矿产普查与勘探专业,获博士学位,现从事页岩气调查研究工作。
作者简介:陈绵琨(1969—),男,高级工程师,1991年毕业于中国地质大学(武汉)地质力学专业,现从事南方海相常规、非常规天然气勘探开发工作。
基金资助:
湖北省自然科学基金一般面上项目“鄂西地区陡山沱组烃源岩差异沉积演化特征研究”(2022CFB420);中国石化江汉油田分公司勘探开发研究院科技项目“二叠系、侏罗系典型地层剖面建立与研究项目”(31400032-22-ZC0613-0028-BG02);湖北省地质局科技项目“湖北恩施地区大隆组页岩孔隙连通性研究”(KJ2023-67)

Geological characteristics of the second member of the Permian Wujiaping Formation in the Longmenba Section, eastern Chongqing

CHEN Miankun¹, XU Lulu², YAO Mingjun¹, LIU Zaoxue², WEN Yaru²

1. Sinopec Jianghan Oilfield Company, Wuhan, Hubei 430074, China;
2. Hubei Geological Survey, Wuhan, Hubei 430034, China

Received:2024-04-14 Revised:2025-07-20 Online:2025-09-25 Published:2025-10-30

摘要/Abstract

摘要： 目前渝东地区梁平—开江海槽内红星地区二叠系吴家坪组二段(简称吴二段)已获得页岩气商业开发,但鄂西海槽中北部地区页岩气成藏条件研究相对薄弱。为此,通过对渝东奉节县龙门坝二叠系吴二段地层剖面进行精细测量及样品分析,阐明了吴二段页岩储层特征,并对鄂西—渝东页岩气勘探潜力区进行了预测。结果表明:吴二段富有机质页岩厚度达29.3 m,可划分为5个小层,富有机质段为1、3、4、5小层,以黑色含泥硅质岩夹硅质页岩为主,地层由下向上钙质含量增加;1、3小层为火山灰密集层段,以101层近顶部C.wangi牙形石首现作为吴家坪阶与长兴阶界线;富有机质段沉积于潮湿—半潮湿—半干旱气候,且底水缺氧和高生产力的古环境,TOC平均为6.34%,为富碳、富硅、低孔、低渗储层;与红星地区和恩施地区相比,尽管吴二段埋深相对较浅(多小于2 000 m),但厚度大(30 m左右)、TOC高(大于4.00%),因此,仍具有良好的页岩气成藏潜力。研究成果可为鄂西—渝东地区页岩气勘探开发示范区的建设提供地质依据。

关键词: 吴家坪组, 黑色页岩, 渝东地区, 储层特征, 成藏潜力

Abstract: Currently, commercial development of shale gas has been achieved in the Second Member of the Permian Wujiaping Formation (referred to as Wu 2 Member) in the Hongxing Area within the Liangping-Kaijiang Trough in eastern Chongqing. However, research on shale gas accumulation conditions in the north-central part of the western Hubei Trough remains insufficient. Therefore, through detailed measurement and sample analysis of the Permian Wu 2 Member stratigraphic section in Longmenba, Fengjie County, eastern Chongqing, the characteristics of the Wu 2 Member shale reservoir were clarified and the shale gas exploration potential areas in western Hubei-eastern Chongqing were predicted. The results indicate that the thickness of organic-rich shale in the Wu 2 Member reaches 29.3 m and can be divided into five sub-layers. The organic-rich intervals are sub-layers 1, 3, 4 and 5, mainly composed of black argillaceous siliceous rocks interbedded with siliceous shale, with increasing calcareous content upward in the formation; sub-layers 1 and 3 are volcanic ash-dense intervals,with the first appearance of the conodont C.wangi near the top of bed 101 as the boundary between the Wujiapingian and Changxingian stages; the organic-rich intervals were deposited in a humid,semi-humid,semi-arid climate with anoxic bottom water and high productivity paleoenvironments. The average TOC is 6.34%, characterizing a carbon riched, silicon riched, low porosity, low permeability reservoir. Compared with the Hongxing Area and the Enshi Area, although the Wu 2 Member has a relatively shallow (mostly less than 2 000 m) burial depth, it has large thickness (about 30 m) and high TOC (greater than 4.00%), thus still possessing good shale gas accumulation potential. The research results can provide geological basis for the construction of a shale gas exploration and development demonstration area in western Hubei-eastem Chongqing.

Key words: black shale, reservoir characteristics, accumulation potential, Wujiaping Formation, eastern Chongqing

中图分类号:

TE122

陈绵琨, 许露露, 姚明君, 刘早学, 温雅茹. 渝东地区龙门坝剖面二叠系吴家坪组二段地质特征[J]. 特种油气藏, 2024, 32(5): 66-75.

CHEN Miankun, XU Lulu, YAO Mingjun, LIU Zaoxue, WEN Yaru. Geological characteristics of the second member of the Permian Wujiaping Formation in the Longmenba Section, eastern Chongqing[J]. Special Oil & Gas Reservoirs, 2024, 32(5): 66-75.

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渝东地区龙门坝剖面二叠系吴家坪组二段地质特征

Geological characteristics of the second member of the Permian Wujiaping Formation in the Longmenba Section, eastern Chongqing

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