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、定形期等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.生储盖匹配良好;烃源岩为古近系、白垩系和中一下侏罗统的海相与清湖相泥岩、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.盆地具有一定的油气勘探前景.

Alay Basin is located at the northern margin of Tethyan structural belt and belongs to an intermontane basin that developed from Paleozoic basement. During Mesozoic-Cenozoic, the basin underwent the following main tectonic evolution phases: epicontinental sea sedimentation, pseudo-foreland basin, intermontane basin, depression and basin-shaping phases. It is characterized by continental-marine interaction, various depositions, multistage superposition and fault-depression conversion. The condition of petroleum geology of the basin is similar to that of Filgarna Basin. Better match of hydrocarbon source rocks, reservoirs and cap rocks indicate that the main hydrocarbon source rocks are Paleogene black shale, Cretaceous limestone and Lower-Middle Jurassic coal-bearing formation; the chief reservoir beds are fractured carbonate rocks and sandy conglomerates; the regional cap rocks are the Upper Jurassic to Pliocene shales and anhydrite rocks. Well-developed folds with anticlines, fault blocks and fault noses are in majority. All conditions imply good hydrocarbon potential and oil and gas prospecting.