Changxing Formation Biohermal Gas Pools and Natural Gas Exploration, Sichuan Basin

详细信息   

• 责任者：Chen Zongqing （Geological Exploration and Development Research Institute of Sichuan Petroleum Administration ; Chengdu 610051 ; China）
• 刊名：Petroleum Exploration and Development
• 出版年：2008
• 卷期：35(2)
• 关键词：岩礁储集层 ; reef reservoirs ; 气藏 ; gas reservoirs ; 四川盆地 ; Sichuan Basin
• 页码：p.148-156，163
• 图表：6 illus., 2 tables, 18 refs.
• 分类号：1003
• issnNo：ISSN1000-0747
• isbnNo：CN11-2360/TE

摘要

Plain fluvial facies, paralic facies, shallow gentle slope facies on carbonate platforms, platform marginal reef facies, Kailiang trench facies, and northern Sichuan-western Hubei ocean basin facies are developed in the Permian Changxing Formation and have favorable source-reservoir-seal conditions. To improve the seismic prediction reliability of biohermal anomalies, an identifying model of biohermal seismic anomalies was established in late 1990s based on the geological features of known reefs and the corresponding seismic reflection features, and 182 biohermal anomalies were found in eastern Sichuan. Researches on sedimentary facies reveal a platform marginal reef facies from both sides of the Kailiang trench to west Hubei, and the seismic anomalies of 36 marginal reefs have been found there. These marginal reefs have large areas and high drill proved reserves. The facies belt is likely to extend to the western margin of the basin. Many point reefs are developed on the slope platform facies, and 146 seismic anomalies of point reefs are found in eastern basin. Point reefs are possibly developed widely in central basin.