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由于侵入岩及其外变质带在完全还原条件下成岩 ,其特殊的储集层发育机理正在受到有关学者的关注。研究认为 ,岩浆冷凝、热接触变质作用和水岩反应决定了该复合岩体的基本岩相结构以及储集单元的规模与分布。在这 3种成岩机制作用下 ,岩体中心相、边缘相、角岩相和板岩相 4个亚相带分别具有不同优势的孔缝组合 ,其中 ,石榴石角岩带的粒间孔缝、岩体边缘相的溶蚀孔缝和板岩相的构造裂缝为有利的储集空间类型。活跃的变质热液在该特殊岩相带储集层的形成和演化过程中扮演着极其重要的角色 ,其早期沿热液通道向岩体内部呈透入式溶蚀 ,在还原条件下形成了大量的溶蚀孔缝 ;后期热液碳酸盐充填裂缝 ,导致各亚相带的储集单元之间相互分隔 ,储集层发育间断 ,因此 ,该复合岩体仅在封闭的成岩体系解体以后才能参与围岩的埋藏成岩演化 ,其有效储集空间主要来自早期储集单元在构造或挠曲变形作用下的裂缝连通。
Due to the intrusive rocks and their metamorphic belts diagenetic under the conditions of complete reduction, the special mechanism of reservoir development is receiving the attention of relevant scholars. The study shows that magmatic condensation, thermal contact metamorphism and water-rock reaction determine the basic lithofacies and the size and distribution of reservoir units. Under these three diagenetic mechanisms, the pore facies assemblage has different advantages in the four facies belts of central phase, marginal facies, angular facies and slate facies. Among them, the intergranular pores of the garnet rock belt , The faulted pores in the marginal facies of the rock mass and the structural cracks in the slate facies are favorable reservoirs. The active metamorphic hydrothermal fluid plays an extremely important role in the formation and evolution of this special lithofacies reservoir. The early metamorphic hydrothermal solution penetrates into the interior of the rock intrusively and forms a large amount of The later period hydrothermal carbonate filling cracks, resulting in the sub-facies of the reservoir units separated from each other, the development of intermittent reservoirs, therefore, the composite rock body only after the dissolution of the closed diagenetic system to participate The burial diagenetic evolution of the surrounding rock is mainly due to the fracture connectivity of the early reservoir units under the structural or flexural deformation.