吐哈盆地三叠系储层特征与成岩作用的关系

The characteristics of Triassic reservoir and its relation to diagenesis in Tulufan-Hami Basin

依据吐哈盆地三叠系砂岩储集岩系的岩石物性、岩石薄片、X-衍射和扫描电镜等测试分析资料,研究并描述了三叠系砂岩的储层物性特征、次生孔隙类型及其与成岩作用的关系。综合分析认为:吐哈盆地三叠系储层主要为中上三叠统长石质岩屑砂岩,孔隙类型以次生孔隙为主,储层物性相对较差,总体属于中孔-低渗或低孔-低渗性储层;成岩演化过程中形成的裂隙-溶蚀型次生孔隙构成吐哈盆地三叠系相对有利的主要油气储集空间类型,且主要分布于盆地西部的托克逊凹陷。

Triassic sandstone is the important oil and gas reservoirs in TulufanHami Basin.The characteristics of Triassic reservoir and its relation to diagenesis are studied on the basis of the Xray diffraction,casting thin sections,scanning election microscope and petrophysical properties.The physical property of Triassic reservoir in TulufanHami Basin is generally bad in the feature of small porositysmall permeability and medium porositysmall permeability.As the primary pore structure of Triassic sandstone was greatly transformed by diagenesis,the secondary pore became the major reservoir space of the sandstone.So,the accumulated space of oil and gas is mainly composed of secondary pores of fissure type and corroded type,which mainly scatter in Tuokexun Sag of TulufanHami Basin.