源内油气藏源–储耦合关系——以鄂尔多斯盆地华庆地区长7段致密油为例

Source-Reservoir Coupling Relationship of Endogenous Oil and Gas Reservoirs—Taking the Chang 7 Tight Oil in Huaqing Area of Ordos Basin as an Example

摘要: 华庆地区长7段致密油资源丰富，源–储耦合关系的研究是储层形成机理的核心问题。本文通过研究生烃过程及储层的成岩演化，探讨烃源岩生烃过程与储层成岩演化之间的耦合关系，明确研究区致密油油气藏的源–储耦合关系。研究表明，长7段烃源岩在距今125 Ma~102 Ma为主要生烃期，而致密储层处于中成岩A期，致密砂岩储层在110 Ma时次生孔隙较发育，孔隙度均值达到12%，是因为烃源岩生烃产生的有机酸充注到储层的原生孔隙中，使储层的溶蚀作用加强，增大了储层的储集空间，是现今致密油形成的关键因素。

Abstract: The Huaqing area is rich in tight oil resources in the Chang 7 member, and the study of the source-reservoir coupling relationship is a issue in the mechanism of reservoir formation. By studying the hydrocarbon generation process and the diagenetic evolution of the reservoir, this paper explores the coupling relationship between the hydrocarbon generation process of source rock and the diagenetic evolution of the reservoir, and clarifies the source-reservoir coupling relationship of the tight oil and gas reservoirs in the study area. The study shows that main hydrocarbon generation period of the source rock in the Chang 7 member was from 125 to 102 Ma, while the tight reservoir was in the mesodietic A stage. Secondary pores in the tight sandstone reservoir were relatively well-developed from 110 Ma, with an average porosity of 12 This is because the organic acids produced by the hydrocarbon generation of the source rock filled the primary pores of the reservoir, which enhanced the dissolution of the reservoir, increased the physical properties of reservoir, and improved the storage space of the reservoir, which is a key factor in the formation of the present-day tight oil.