地质科学2011，Vol.46Issue(1)：258-272,15.
四川盆地中三叠统-上三叠统马鞍塘组天然气藏特征和有利勘探地区
The gas reservoir characteristics and advantageous exploration areas in Middle Triassic Leikoupo Formation-Upper Triassic Ma'antang Formation in Sichuan Basin
摘要
Abstract
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. Recently, the hydrocarbon shows in Leikoupo Formation were found during drilling and revealed a good exploration prospect for the unit. The reservoir rocks of Middle Triassic gas pools are mainly located in the base(T2l1) and top of the formation( T2l3-T2l4) 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 mierite 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 (T2l3-4). The characteristics of the sourcereservoir-seal plays of Middle-Upper Triassic in Sichuan Basin are divided into two types: 1 )upper Permian Longtan Formation source rock+the reservoir rocks in the first-second segment of Leikoupo Formation(T2l1-2) +the anhydrite-salt seal in Leikoupo Formation; 2)Upper Triassic source rock+the reservoir rocks in the third-fourth segment of Leikoupo Formation(T2l3-4) and in upper Triassic Ma'antang Formation+the mudstone seal in the Upper Triassic. The frontier area of the central-southern segment of Longmen Mountain should be the prospect area of the oil-gas exploration in the top Leikoupo Formation( T2l3-4) and Ma'antang Formatioon in Sichuan Basin.关键词
四川盆地/中三叠统/马鞍塘组/天然气藏/勘探前景Key words
Sichuan Basin/ Triassic/ Leikoupo Formation/ Ma'antang Formation/ Gas pool/ Exploration prospect分类
天文与地球科学引用本文复制引用
秦川,刘树根,汪华,孙玮,李德星,杨荣军,张长俊,吴熙纯..四川盆地中三叠统-上三叠统马鞍塘组天然气藏特征和有利勘探地区[J].地质科学,2011,46(1):258-272,15.基金项目
中石化前瞻性项目"华南古板块地裂运动与海相油气前景"(编号:PH08001)资助. （编号:PH08001）
