中文摘要：

位于准噶尔盆地腹部中Ⅲ区块的永进地区白垩系与侏罗系之间存在一个区域性的不整合面，即J--K不整合面。西山窑组次生孔隙发育带位于J—K不整合面之下。CIA指数显示，表生期大气淡水的淋滤作用主要以物理风化作用为主，化学风化作用较弱，风化作用主要提高了孔隙的连通性。深埋后有机质成熟产生的有机酸溶蚀长石、岩屑等易溶矿物，中Ⅲ区块在地质历史时期为低压场区，是准噶尔盆地腹部流体的排泄区域，不整合面经过大气淡水的改造而成为流体运移的优势通道，长石等的溶蚀产物高岭石等被流体带离迁移出溶蚀区域，从而改善了砂岩的储集性能。

英文摘要：

With the development of petroleum exploration, deep reservoir is becoming one foucus of oil/gas exploration. Yongjin Block is located in the center, Junggar Basin, where the target of Jurassic interval deeply is buried. The secondary porosity below the unconformity is developed between Cretaceous and Jurassic, which resulted from the leaching of meteoric water and deeply burial dissolution. Meteoric leaching is mainly a physical-weathering progress with little chemical alteration so that the pores are greatly connected with each other. While the deeply hurried organic substances leads to feldspar dissolution. On the other hand, the dissolved product, kaolinite, is transferred out from the dissolution zone because of the main pathway of the unconformity and the relatively low pressure of the Yongjin Block. All this accounts for the considerable development of the secondary porosity.