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为了探索断裂对高孔隙性储层改造作用,在部分渤海湾盆地钻井取芯资料及结合国内外相关研究的基础上,对高孔隙砂岩变形机制、发育的亚地震构造及其特征进行了系统分析.认为高孔隙性砂岩变形有别于低-非孔隙性岩石,不是由破裂作用产生裂缝,而是由于颗粒流作用、碎裂作用和碎裂流作用形成与裂缝相对应的另一种类型亚地震构造,而岩石变形产生的亚地震构造对储层具有反向改造作用.高孔隙性砂岩变形形成的亚地震构造为物性较母岩明显降低的变形带.研究结果表明:变形带孔隙度比母岩低10%~25%,渗透率比母岩低1~7个数量级,变形带包括解聚带、碎裂带、压溶胶结碎裂带和硅酸盐带4种类型,渗透率具有依次降低趋势.高孔隙性储层变形产生变形带,因变形带物性低,造成储层物性整体变低,低-非孔隙性储层变形产生裂缝,提高储层物性.
In order to explore the role of faults in the reformation of highly-porous reservoirs, based on the drilling coring data in some Bohai Bay basins and the related researches at home and abroad, the deformation mechanism, development of sub-seismic structures and their characteristics of high-porosity sandstone are systematically analyzed It is considered that the deformation of highly porous sandstone is different from that of low - non - porous rock, not because of fracture, but due to the action of particle flow, fragmentation and fragmentation, another type of subfacies corresponding to the fracture Seismic tectonics, and the sub-seismic structure produced by the deformation of the rock has the effect of reverse alteration of the reservoir.The sub-seismic structure formed by the deformation of the highly porous sandstone is a deformation zone with a significantly lower physical property than that of the parent rock.The results show that the porosity ratio The parent rock is 10% -25% lower than that of the parent rock, and the permeability is 1 ~ 7 orders of magnitude lower than that of the parent rock. The deformation zone includes 4 types of decondensed zone, crushed zone, crushed sol- gel fractured zone and silicate zone. Which leads to the decrease of the trend.The deformation zone of high-porosity reservoirs will produce deformation zones, and the low physical properties of the deformation zones will cause the overall physical properties of the reservoirs to become lower and the deformation of low-non-porosity reservoirs will produce cracks and improve reservoir physical properties.