沉积盆地储集层微裂隙研究

以松辽盆地东南十屋断陷为例，详细研究了储集层内分布的微裂隙类型、密度、张开度，并对影响裂隙的因素及其形成机制进行了探讨。结果表明：微裂隙的主要类型与宏观大裂隙的类型和分布部位是一致的；储集层裂隙发育带主要分布在构造曲率高值区，同时也与埋藏深度、岩性、地层厚度及储集层孔隙度及距最近断层距离存在非线性相关关系；区域水平挤压应力场是造成储集层裂隙形成的动力来源。

Research for the Microfracture of the Reservoir Rocks in Sedimentary Basin

The type, density and open width of the microfractures in Shiwu faultdown are studied systematically, in which the mechanics and factors controlling microfractures are stated. It is concluded that the distribution and the main kinds of microfractures are correspondent to those of macrofractures. The belts of high density fracture in reservoir rocks are located in the areas with high structural curvature value, which have a nonlinear relationship with the depth, rock types, stratigraphic thickness, reservoir porosity and the distance from the faults. It is due to the structural compression stress that leads to the formation of microfracture.