羌塘盆地双湖地区古油藏白云岩储层的显微成岩组构特征及意义

根据铸体薄片、阴极发光、扫描电镜观察和荧光显微镜分析,详细地描述了羌塘盆地双湖地区古油藏含油白云岩的显微组构类型和特点.广泛发育的自形白云石环边结构等淡水成因标志表明,该区白云岩化是通过大气水-海水孔隙混合流体交代灰岩形成的,白云岩化过程中晶间孔、晶间溶蚀孔以及溶蚀裂缝发育极大地改善了储层性能和品质.该区白云岩储层可能具有良好的油气勘探前景.

Microscopic diagenetic fabrics of dolomite reservoir from Shuanghu paleo-oil pool of Qiangtang Basin and its petroleum exploration implications

In this paper, the microscopic diagenetic fabrics of dolomite reservoir from Shuanghu paleo-oil pool of Qiangtang Basin is described based on molded thin section, scan electron microscope cathodoluminescent and fluorescent analysis. The petrographic evidences of widespread euhedral dolomite crystals with freshwater zoning textures indicate that most dolomites are diagenetic replacements of limestone by subsurface mixed meteoric-marine pore fluid. Dolomitization creates intercrystalline pores, intercrystalline dissolusoin pores and fissures. It largely improves the reservoir quality. In this region, the dolomite reservoir probably has a good petroleum exploration potential.