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

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

Issue:
2019年第05期
Page:
529-540
Research Field:
基础地质与矿产地质
Publishing date:

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
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)
Keywords:
geochemistry;  reservoir;  shale gas;  fluid inclusion;  hydrocarbon charging;  Wufeng Formation;  Longmaxi Formation;  Gongtan syncline;  Chongqing
PACS:
P618.13
DOI:
-
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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Last Update: 2019-09-19