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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第41卷

期数:

2019年第05期

页码:

529-540

栏目:

基础地质与矿产地质

出版日期:

2019-09-15

文章信息/Info

Title:

Geochemical Characteristics of Fluid from Shale Gas Reservoir of Wufeng- Longmaxi Formations in the Southeastern Chongqing, China —A Case Study of Well YC2

文章编号:

1672-6561(2019)05-0529-12

作者:

黎琼¹; 欧光习¹; 汪生秀²; 3; 张敏¹; 吴迪¹

(1. 核工业北京地质研究院,北京 100029; 2. 重庆地质矿产研究院 自然资源部页岩气资源勘查重点实验室, 重庆 401120; 3. 重庆地质矿产研究院 页岩气勘探开发国家地方联合工程研究中心,重庆 401120)

Author(s):

LI Qiong¹;  OU Guang-xi¹;  WANG Sheng-xiu²; 3;  ZHANG Min¹;  WU Di¹

(1. Beijing Research Institute of Uranium Geology, Beijing 100029, China; 2. Key Laboratory of Shale Gas Exploration of Ministry of Natural Resources, Chongqing Institute of Geology and Mineral Resources, Chongqing 401120, China; 3. National Joint Local Engineering Research Center for Shale Gas Exploration and Development, Chongqing Institute of Geology and Mineral Resources, Chongqing 401120, China)

关键词:

地球化学;  储层;  页岩气;  流体包裹体;  油气充注;  五峰组;  龙马溪组;  龚滩向斜;  重庆

Keywords:

geochemistry;  reservoir;  shale gas;  fluid inclusion;  hydrocarbon charging;  Wufeng Formation;  Longmaxi Formation;  Gongtan syncline;  Chongqing

分类号:

P618.13

DOI:

-

文献标志码:

A

摘要:

渝东南地区五峰组—龙马溪组页岩气储层中发育粉砂岩夹层和裂缝脉体。以酉参2井五峰组—龙马溪组页岩有机地球化学特征分析以及粉砂岩夹层和裂缝脉体的显微岩相学、流体包裹体特征分析为基础,结合恢复的酉参2井埋藏生烃史,深入探讨了研究区页岩气的形成与成藏特征。五峰组—龙马溪组页岩的粉砂岩夹层中记录了两期油气充注过程:第一期油气充注时间为早三叠世,页岩为低成熟—成熟阶段,油气的成熟度较低,为粉砂岩夹层石英颗粒中的重质油包裹体以及粉砂岩夹层粒间孔隙中的褐色、深褐色沥青; 第二期油气充注时间为早侏罗世,页岩处在成熟阶段,主要为沿切穿石英颗粒微裂缝成带状分布的气烃包裹体以及石英颗粒中充注的轻质油。五峰组—龙马溪组裂缝脉体中捕获大量纯气包裹体,主要成分为CH₄,来源于五峰组—龙马溪组的页岩气,被捕获时间主要为白垩纪。渝东南局部地区五峰组—龙马溪组页岩虽具有良好的生烃条件与保存条件,但在页岩气勘探过程中,需在考虑区域地质构造的基础上讨论页岩气成藏与保存的有效性。

Abstract:

The silty sandstone interlayers and fracture veins are developed in shale gas reservoir of Wufeng-Longmaxi Formations in the southeastern Chongqing, China. The generation and preservation characteristics of shale gas of well YC2 in Wufeng-Longmaxi Formations were deeply investigated in terms of the organic geochemical characteristics of shales, the microscopic characteristics of silty sandstone interlayers and fracture veins, as well as the characteristics of fluid inclusion. The results indicate that there are two stages of hydrocarbon charging processes in silty sandstone interlayers. Stage 1 occurs at Early Triassic, in which shales are in the lowly mature-mature development stage, consisting of heavy oil inclusions distributed in the quartz grains and residual brown-dark brown asphalt between the quartz grains. Stage 2 occurs at Early Jurassic, in which shales are in the mature development stage, consisting of shale gas inclusions distributed zonally along the micro-fractures of the quartz grains and light oil between the quartz grains. The fracture veins in Wufeng-Longmaxi Formations trap a lot of pure gas inclusions. CH₄ from the shales of Wufeng-Longmaxi Formations is the main composition of the pure gas inclusions. The gas inclusions are trapped mainly in Cretaceous. The shales of Wufeng-Longmaxi Formations in some areas of the southeastern Chongqing have good hydrocarbon generation and preservation conditions. In the process of shale gas exploration, the regional geological structure must be considered for discussion on the effectiveness of the gas accumulation and preservation.

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备注/Memo

备注/Memo:

收稿日期:2019-03-19; 修回日期:2019-05-19投稿网址:http:∥jese.chd.edu.cn/
基金项目:中国地质调查局地质调查项目(DD20160177-02-01)
作者简介:黎 琼(1987-),女,湖南娄底人,工程师,E-mail:372953880@qq.com。

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更新日期/Last Update: 2019-09-19