塔西南南天山山前白垩系储集层特征及有利区带预测

下白垩统克孜勒苏群是塔西南地区最重要的含油气层系。研究表明,其储集层岩石类型以辫状河河道沉积的岩屑细砂岩为主,孔隙类型以粒间溶孔和粒内溶孔为主。储集层物性受控于沉积环境、成岩作用、粘土矿物的类型及含量。克孜勒苏群沉积在古生界风化剥蚀形成的古地形之上,南天山山前乌恰构造带、昆仑山山前乌泊尔构造带和甫沙构造带下白垩统厚度大,且处于有利的沉积相带之上,是扩大白垩系油气勘探成果的有利区带。

The Cretaceous Reservoir Characteristic and Favorable Zone Prediction in South Tianshan Piedmont in Southwestern Tarim Basin

The Kezilesu group of Lower Cretaceous is the most important oil -bearing series in southwestern Tarim basin. Study of reservoir characteristics shows that the major rock type is lithic fine sandstone developed in braided river channel. The reservoir space is dominated by intergranular and intragranular solution pores. The reservoir petrophysical property is controlled by the sedimentary environment, the diagenesis and the type and content of clay mineral. Kezilesu group is deposited above the paleo-landform formed by Paleozoic weathering and erosion. It is recognized that Wuqia, Wuboer and Fusha structural belts are of large thickness of Lower Cretaceous strata, lie on the favorable sedimentary facies, and should be the favorable and target zones for further petroleum exploration in this area.