Geochemical characteristics of nonhydrocarbon in natural gas in west Sichuan Depression and its implications

被引：0

作者：

Wang, Peng ^{[1
]}

Shen, Zhong-Min ^{[1
]}

Liu, Si-Bing ^{[1
]}

Lv, Zheng-Xiang ^{[1
]}

Wang, Le-Wen ^{[2
]}

机构：

[1] State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology

[2] Institute of SINOPEC Shanghai Offshore Oil and Gas Company

来源：

Natural Gas Geoscience | 2014年 / 25卷 / 03期

关键词：

Gas source; Genetic; Migration; Natural gas; Nonhydrocarbon; West Sichuan Depression;

D O I：

10.11764/j.issn.1672-1926.2014.03.0394

中图分类号：

学科分类号：

摘要：

The geochemical characteristics of nonhydrocarbon in natural gas in western Sichuan Depression were analyzed to investigate the origin, maturity, migration and source of natural gas in the study area. The nonhydrocarbon gases mainly contain CO2, N2 and noble gas. CO2 mainly comes from the dissolution of carbonate mineral, N2 mainly originates during the thermal evolution of organic matter at mature and high mature stages, and noble gas mainly originates during the radiation process of element in crust rock. The evidence of nonhydrocarbon indicates that natural gas is thermogenic gas derived from the crust and is mainly at mature and high mature stages. The results of gas migration by nonhydrocarbon trace method show that N2 is an effective index for natural gas's vertical migration, however, when CO2 mainly comes from the dissolution of carbonate mineral, CO2 may be not able to trace the migration of natural gas effectively. The analysis of noble gas demonstrates that the Upper Triassic natural gas is mixed gas from argillaceous source rocks and coal of Upper Triassic source rock.

引用

页码：394 / 401

页数：7

共 42 条

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