The Gas Reservoir Characteristics and Advantageous Exploration Areas in Middle Triassic Leikoupo Formation-Upper Triassic Ma’antang Formation in Sichuan Basin

详细信息   

• 责任者：Qin Chuan (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation ; CDUT ; Chengdu 610059 ; China) ; Liu Shugen
• 刊名：Chinese Journal of Geology
• 出版年：2011
• 卷期：46(1)
• 关键词：气藏 ; gas reservoirs ; 四川盆地 ; Sichuan Basin
• 页码：p.258-272
• 图表：7 illus., 1 table, 19 refs.
• 分类号：1003
• issnNo：ISSN0563-5020
• isbnNo：CN11-1937/P

摘要

The exploration history of Middle Triassic Leikoupo Formation is about 40 years in Sichuan Basin, but there are only two large-and medium-sized gas pools found till today.  The reservoir rocks of Middle Triassic gas pools are mainly located in the base and top of the formation with low-medium porosity and low permeability, and the hydrocarbon source rocks were Upper Permian Longtan Formation and Upper Triassic Xujiahe Formation, respectively. The component of natural gas in Middle Triassic was varied. The main reservoir spaces are various secondary dissolved pores, and the reservoir type is porous or fractured-porous. The sealing of gas pools is well-developed with good direct and indirect cap rocks. The reservoir rocks of Upper Triassic Ma’antang Formation are calcarenite and micrite located at the base of the unit, and its source rock and seal are similar to the gas pools in the top of Leikoupo Formation.