阿拉伊盆地构造地质特征与油气条件分析

The analysis on the structural geology characteristics and petroleum-bearing conditions of Alay Basin in Central Area

中亚地区阿拉伊盆地位于特提斯构造带北缘,是在古生界基底之上发展起来的山间盆地,紧邻我国西部塔里木盆地。自中生代至新生代经历了陆表海沉积期、类前陆盆地期、山间盆地发育期、拗陷期、定形期5个演化阶段,具有海陆交互、沉积多变、多期叠加、断—拗转换的性质。油气地质条件与相邻的费尔干纳盆地相似,生储盖匹配良好;烃源岩为古近系、白垩系和中—下侏罗统的海相与湖相泥岩、石灰岩和泥灰岩;主要油气储集层为碳酸盐岩裂缝性储层和砂砾岩储层;多套泥岩、膏岩和泥灰岩为区域性和局部盖层;褶皱构造发育,以背斜、断块、断鼻等构造为主。具有一定的油气勘探前景。

Alay Basin is located at the northern fringe of Tethy structural belt, an intermontane basin developed on the basement of Paleozoic, close to the Tarim Basin in China. During Mesozoic-Cenozoic, the basin mainly underwent the epicontinental deposit phase, pseudo-foreland basin phase , intermontane basin development phase, depression phase and fixed shape phase. It is characterized by continental-oceanic interaction, various depositions, multistage superposition and fault-depression conversion. Its geologic condition for oil and gas is similar to that of Filgarna Basin. It has better source-reservoir-caprock match, the main hydrocarbon source rocks are Paleogene black shale, Cretaceous limestone and the coal-beating of lower-middle Jurassic, the major reservoirs are profitable crack reservoir of carbonate rock and sand-shale formation, the regional cap rocks are shale and gypsolyte from the upper Jurassic to the Pliocene, the regional cap rocks are shale and gypsolyte from the upper Jurassic to the Pliocene, well developed fold structures are mainly anticlines, fault blocks and fault noses, which all have the potential ofexploration prospect.