Prospect of Shale Gas Exploration in the Upper Permian Longtan Formation in the Yangtze Massif
详细信息
- 责任者：Zhou Dongsheng (School of Marine Science and Technology ; China University of Geosciences. Beijing 100083 ; China) ; Xu Linfeng
- 刊名：Natural Gas Industry
- 出版年：2012
- 卷期：32(12)
- 关键词：页岩气 ; shale gas ; 油气勘探 ; petroleum exploration ; 扬子地区 ; Yangtze Region
- 页码：p.6-10
- 图表：2 illus., 1 table, 15 refs.
- 分类号：1003
- issnNo：ISSN1000-0976
- isbnNo：CN51-1179/TE
摘要
The Yangtze massif is one of the areas in South China where oil and gas exploration started very early.Eight sets of black mud shales were deposited on the Yangtze massif during the Paleozoic era. Based on the previous research results and field geologic survey data,this paper analyzes the development characteristics of the Upper Permian Longtan Formation shale,and also discusses its prospect.The black shales in the Longtan Formation are featured by relatively high TOC,high thermal maturity,about 40% of the quartz content,thickness of 20～200 m,and strong adsorption capability,all being favorable conditions for shale gas accumulation and indicating a high shale gas potential there quite similar to the Lewis shale in the San Juan Basin (USA).However,its high clay content,strong heterogeneity,and strong later-stage tectonic modification have an adverse effect on shale gas enrichment.Vertically,the upper and middle members are more favorable for shale gas exploration than the lower member in the Longtan Formation,while horizontally the central and eastern Sichuan Basin and northwestern Chongqing in the Upper Yangtze as well as the southern Jiangsu Province in the Lower Yangtze are favorable for shale gas exploration.