摘要
为明确致密砂岩气藏复杂气水关系控制因素,以四川盆地广安气田须六段气藏为例,通过测井、连井剖面以及压汞物性等资料,综合研究烃源岩分布特征、储集层物性以及构造幅度对气藏气水关系的控制作用。研究结果表明:烃源岩与薄层砂岩间互式分布,供烃能力分散,是须家河组含气层段多、气水关系复杂的根本原因;在相同供烃条件下,天然气优先运移至相对优质的储集层中成藏,造成不同区块气水分异不一的格局;构造幅度也影响致密砂岩气藏的气水分异程度,构造幅度越高,气水分异越充分。因此,致密砂岩气藏气水关系主要受烃源岩分布、储集层物性差异和构造幅度等因素综合控制。
To identify the controlling factors on complex gas-water distributions in tight sandstone gas reservoirs, taking Xu-6 gas reservoir of Guang＇an gas field in Siehuan basin as an example, and based on the data of logging, connecting-well section, seismic section and mercury injection, the paper studies the controls of source rock distribution, reservoir physical properties and structural amplitude on gas-water distributions in gas reservoirs comprehensively. The results show that the source rocks interbedded with thin sandstones supply hydrocarbons sporadically, which is the root cause of multi-gas intervals and complex gas-water distributions in Xujiahe formation; with the same hydrocarbon supply conditions, natural gas will first migrate to and accumulate in good quality reservoirs, which results in varied differentiation of gas and water in different blocks; structural amplitude has impacts on gas and water differentiation degrees in tight sandstone gas reservoirs, and the higher the structural amplitude is, the more sufficient the gas and water differentiation will be. Therefore, the gas-water distributions in tight sandstone gas reservoirs are mainly controlled by hydrocarbon source rock distribution, reservoir physical properties and structural amplitude and so on.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2017年第2期198-203,共6页
Xinjiang Petroleum Geology
基金
国家自然科学基金(41502146
41572137)
国家科技重大专项(2016ZX05007003-007)
中国石油科技创新基金(2015D-5006-0101)
西南石油大学油气成藏地球化学青年科技创新团队(2015CXTD02)
关键词
广安气田
须家河组
致密砂岩气藏
气水关系
控制因素
分散式供烃
储集层物性
低幅度构造
Guang＇an area
Xujiahe formation
tight sandstone gas reservoir
gas-water distribution
controlling factor
scattered hydrocarbon supply
reservoir physical property
low-amplitude structure
