准噶尔盆地西北缘侏罗系储层成岩作用及孔隙演化

对准噶尔盆地侏罗系砂岩储层成岩作用过程的研究结果表明 ,储层的孔隙演化主要与压实作用、溶蚀作用和胶结作用等有密切的关系。压实作用和方解石胶结作用是使原生孔隙遭受破坏的主要成岩作用类型 ;方解石和粘土矿物的溶蚀作用是形成次生孔隙的主要成岩作用类型 ;高岭石的后期充填是使次生孔隙遭受破坏的主要原因。各种成岩作用的时空配置关系控制着孔隙的发育程度 ;储层孔隙发育具垂向分带性。在纵向上可划分出 4个孔隙发育带 ,这对预测本区侏罗系储层物性的空间分布具有重要意义。

Diageneses and pore evolution of Jurassic reservoir in northwestern edge of Junggar basin

The diageneses experienced by Jurassic clastic reservoir in northwestern edge of Junggar basin show that the diagenesis types were related with the pore evolution and the key geologic factors controlling pore evolution. The pore evolution of Jurassic reservoir was mainly resulted from compaction, corrosion and cementation. The compaction and calcite cementation were the most important factors for destroying primary pores, and the corresion acting on calcite and clay minerals was the main factor for producing secondary pores, while destruction of secondary pores was mainly resulted from filling of kaolinite. The matched relation among all kinds of diageneses in time space domain was the key factor for controlling pore development, which in turn leads to the discovery of the vertical zonation of pore development. The division of four pore zones in vertical direction is a significant discovery for Jurassic reservoir prediction of the study region.