金湖凹陷含油玄武岩中孔洞缝的特征及其含油性

以苏北盆地金湖凹陷闵桥地区含油玄武岩为实例，从总结玄武岩中孔洞缝成因、形态组合特征及充填特征入手，系统讨论了孔洞缝及组合的含油性。进而探讨了孔洞缝充填矿物的颜色、类型与含油性之间的关系。孔洞缝组合的含油性受控于含油玄武岩的岩流单元相带和岩相构造类型，古风化剥蚀面含油最丰富，岩流单元上部相带及淬碎角砾岩相含油较稳定，而岩流单元中下部相带含油较贫乏。孔洞缝充填的方式与含油性无关，但充填矿物的颜色、类型与含油性之间存在着对应关系，并服从于岩流单元相带和储油岩相构造类型。

THE FEATURES OF VESICLES,HOLES AND FISSURES IN OIL-BEARING BASALT AND THEIR OIL-BEARING CHARACTERISTICS,JINHU DEPRESSION

The oil-bearing characteristics of vesicles,holes,fissures and their assemblages in basalt as well as the relationship between the colors and types of minerals in the filled vesicles,holes and fissures and the oil-bearing characteristics are systematically discussed in this paper. It shows that the oil-bearing characteristics are controlled by the facies belts of a lava flow unit and the lithofacies-structural types. The content of oil is abundant in the ancient weathered crust of basalt,stable in the upper facies belt of a lava flow unit and the fragmented breccia lithofacies,but poor in the middle and lower facies belts of a lava flow unit. The filling style of minerals in vesicles,holes and fissures is irrelative to the oil-bearing characteristics,but the colors and types of the filled minerals are correspondingly consistent with the oil-bearing characteristics,and are subjected to the facies belts of a lava unit and the oil-reservior lithofacies-structural types.