东濮凹陷三叠系裂缝性砂岩储层微观孔隙结构特征

Characteristics of micropore structure of Triassic sandstone reservoir in Dongpu Depression

国殿斌

Guo Dianbin

中原油田分公司勘探开发科学研究院，河南 濮阳 457001

Research Institute of Exploration and Development, Zhongyuan Oilfield Company, SINOPEC, Puyang 457001, China

通过扫描电镜、岩石薄片、铸体薄片、荧光薄片、常规压汞等技术方法，对东濮凹陷北部三叠系裂缝性砂岩储层的微观孔隙结构特征进行研究。结果表明，东濮凹陷三叠系砂岩储层裂缝、微裂缝发育，裂缝性砂岩储层孔隙由岩石基质孔隙与缝洞孔隙两部分组成，缝洞孔隙是油气储集的有效孔隙，孔隙类型主要为原生粒间孔隙、粒内孔隙，碎屑颗粒之间以点-线式接触为主。砂岩基质结构致密，孔隙性差。储层基质喉道以微喉为主，压汞实验的排驱压力较高，储层基质渗透率较低，储层基质的储、渗性能差。

By the methods of scanning electron microscopy, rock thin section, cast thin section, microscopic fluorescence and conventional murcury injection and so on, the characteristics of microscopic pore structure of Triassic sandstone reservoir in Dongpu Depression were studied. The research shows that the fracture and microfracture were developed well in Triassic sandstone reservoir of Dongpu Depression, the pore system is composed of the rock matrix pores and the fracture-cave pores, which are the effective pore of hydrocarbon storage. The pore type is mainly the primary intergranular pores and intragranular dissolution pores. The contacted relation is mainly the dop-line type among clastic particles, and the porosity is low. The matrix pore of reservoir is mainly the microthoat. The discharge pressure is high in mercury injection experiment. The permeability of matrix rock is low, with the storage and permeability being poor in matrix rock.