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研究松辽盆地徐家围子地区下白垩统营城组火山岩的岩石类型对储集空间的影响,主要;隙度不同型中通过普通薄片鉴定、化学全分析,结合铸体薄片的显微镜下观察、图像孔喉分析以及岩石物性测试,掌握不同岩性的储集空间类型和特征。研究结果显示,本区主要包括火山熔岩、火山碎屑熔岩、正常火山碎屑岩、火山-沉积碎屑岩等4大类18种岩石类型;不同岩性发育的主要孔隙类型和孔隙度不同;形成火山岩的岩浆性质、火山碎屑、原生矿物组合以及结构构造决定了火山岩的原生孔隙以及岩石特征,这些特征对岩石后期成岩演化过程中裂缝、溶缝、溶孔的形成有着直接关系,各种溶蚀裂缝、溶蚀孔隙大大改善了储层物性。
The influence of rock types on the reservoir space of the Lower Cretaceous Yingcheng Formation volcanic rocks in the Xujiweizi area of the Songliao Basin is studied. The results show that the rock types of the Lower Cretaceous Yingcheng Formation in the Songliao Basin are mainly characterized by ordinary flake identification, chemical full analysis and microscopic observation of the casting flake, Image pore throat analysis and petrophysical testing to master the type and characteristics of reservoir space of different lithology. The results show that there are 18 types of rocks in 4 major groups, including volcanic lava, volcaniclastic lava, normal volcaniclastic rocks and volcanic-sedimentary clastic rocks. The main types and porosity of different lithology are different. The magmatic properties, volcanic detritus, primary mineral assemblages and structural formation of volcanic rocks determine the primary porosity and rock characteristics of the volcanic rocks. These characteristics are directly related to the formation of fractures, dissolved seams and dissolved pores during the late diagenesis of rocks. Corrosion cracks, dissolved pores greatly improved reservoir physical properties.