辽河坳陷太古宇基底储层研究进展

通过岩石元素含量确定辽河坳陷变质岩的原岩,认为辽河坳陷变质岩原岩类型多样,通过三轴应力测试,确定了太古宇基岩内幕不同岩性的抗压、抗剪特性,分析了不同受力条件下岩石的碎裂特征,建立了压应力以及剪切应力条件下的"优势岩性"序列。测试资料显示,太古宇基岩储层的形成主要受外部应力以及岩石本身特性双重因素控制。在正应力条件下,岩石破碎主要受岩石中的暗色矿物含量影响,暗色矿物含量越少,岩石越容易破碎形成储层;在剪切应力条件下,岩石破碎主要受岩石结构的非均一性决定,结构的非均质性越强,岩石越容易破碎形成储层。从岩石的抗剪、抗压程度来看,剪切应力条件下岩石更易破碎形成储层。

Reservoir research progress of Archaeozoic bedrock in Liaohe depression

Through rock elements content analysis, the original rock of metamorphic rock has been analyzed and the types of it are varied. Through three-axis stress experiment, the compression and shearing resistance properties of different lithologies in Archaeozoic bedrock inside have been determined, the rock fragmentation under different conditions has been analyzed and then the "superior lithology sequence" under the conditions of pressure stress and shearing stress has been established. Testing data indicates the reservoir development of Archaeozoic bedrock is mainly controlled by external stress and the rock characteristics itself. Under the normal stress condition, the rock fragmentation is mainly affected by the dark mineral content, the less the dark mineral content, the more easily rock fragmentation and more easily reservoir formation. Under shear stress condition, rock fragmentation is mainly affected by rock structure of the non-uniform sex determination, the stronger the structure of the heterogeneity, the more easily rock fragmentation. From the rock compression and shearing resistance, rock fragmentation is more likely to form reservoir under shearing stress conditions.