Sichuan Weiyuan Gas Field: Taking Mantle-Crust Source as an Example
详细信息
- 责任者：Wang Peiye (Eastern China Geological & Mining Organization for Non-Ferrous Metals ; Nanjing 210093 ; China) ; Song Tao
- 刊名：Contributions to Geology and Mineral Resources Research
- 出版年：2011
- 卷期：26(1)
- 关键词：气田 ; gas fields ; 含油气系统 ; petroliferous system ; 四川 ; Sichuan Province
- 页码：p.63-73
- 图表：10 illus., 6 tables, 28 refs.
- 分类号：1003
- issnNo：ISSN1001-1412
- isbnNo：CN12-1131/P
摘要
Weiyuan gas field in the south of Sichuan Basin is a large gas field with the most ancient reservoir in China and even the in the world controlled by axis of Leshan-Longnusi anticline. Dolomite and thin interlayers of mudstone of Proterozoic Sinian Dengying Formation and mudstone of Doushantuo Formation are the gas accumulation strata. Direct cap rock is mudstone of Cambrian Jiulaodong Formation. All strata and fracture in granite contain natural gas in the region. The gas field is characteristic of 1) gas controlled by the anticline axis southward shift; 2) showing natural gas R0 value and He, Ar accumulation effect with ageing of the stratum; 3) high correlation among C2H6, He, H2S, CO2 and N2, CH4, the main component of natural gas; 4) similar δ13C1, δ13C2 and δ13C CO2 value; 5) high He and Ar content; 6) multiple fluid flowing and trapping; 7) mantle-crust-derived water under; and 8) asphalt geochemistry of mantle-crust mixture.