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三塘湖盆地的上、下二叠统和石炭系发育 3套典型的火成岩 ,主要岩类有玄武岩、安山岩和辉绿岩等 ;储集空间包括原生孔隙和裂缝以及次生溶孔和裂缝 ,进一步可分为原生气孔、残余气孔、原生粒间孔隙、冷凝收缩缝、收缩节理、颗粒爆炸纹缝、斑晶溶蚀孔、铸模孔、粒间溶孔、基质溶蚀孔、蚀变物溶蚀孔、裂缝充填再溶蚀孔、杏仁体溶孔、构造裂缝、风化裂缝、溶缝等。火成岩在成岩和后生变化过程中 ,发生了交代蚀变作用、充填作用和溶解作用等成岩事件 ,原生孔隙经历了复杂的充填和溶蚀过程才形成现今的面貌。火成岩的岩相、成岩作用和构造运动控制了火山岩的储集性能。图 1参 4
Three sets of typical igneous rocks are developed in the upper and lower Permian and Carboniferous of the Santanghu Basin. The main types of rocks are basalt, andesite and diabase. The reservoir space includes primary pores and fissures, secondary pores and fissures, It can be further divided into primary pores, residual pores, primary intergranular pores, condensation and shrinkage joints, shrinkage joints, grain explosion lines, porphyrin dissolution holes, mold holes, intergranular dissolution pores, matrix dissolution pores, Crack filling and then dissolved pores, almond dissolved pores, structural cracks, weathering cracks, such as dissolved joints. In diagenesis and epigenetic changes, igneous rocks occur diagenesis events such as alteration, filling and dissolution, and the primary porosity undergoes complicated filling and dissolution processes to form the present appearance. The lithofacies, diagenesis and tectonic movements of igneous rocks control the reservoir properties of volcanic rocks. Figure 1 Senate 4