论文部分内容阅读
利用大量砂岩样品的普通薄片、铸体薄片、阴极发光、物性分析等资料,研究了库车前陆冲断带白垩系中-深层砂岩储层的物性、孔喉类型和成岩作用特征,并通过开展各种成岩参数(压实减孔量、胶结减孔量、粒间体积、碳酸盐胶结物含量、溶蚀孔面孔率)和储层物性的相关分析,结合构造演化,认为中层砂岩储层物性主要受碳酸盐胶结作用和溶蚀作用控制,深层砂岩储层物性主要受晚期压实作用、胶结作用和裂缝共同控制;构造挤压是控制晚期压实和物性变化的主要原因.研究结果表明:从中层到深层砂岩储层,孔隙度和渗透率的相关系数从0.79降为0.35,相关曲线斜率值从0.24降为0.09,深层砂岩基质渗透率基本在0.01~0.10mD之间;孔喉类型由缩颈型、点状演变为片状、弯片状喉道为主;中层砂岩压实弱,碳酸盐主要胶结后的晚期压实发育不明显;深层砂岩压实强,碳酸盐胶结之后仍发育显著的晚期压实作用;而中-深层砂岩的胶结程度差别不大,溶蚀程度与残余粒间孔和裂缝发育有关.依据储层控制因素可知,深层储层的南部,埋深更大,孔隙却相对发育.
The physical properties, pore-throat types and diagenetic characteristics of Cretaceous middle-deep sandstone reservoirs in the Kuqa foreland thrust belt were studied by using a large number of ordinary thin slices of sandstone, thin castings, cathodoluminescence and physical property analysis. Based on the correlation analysis of various diagenesis parameters (compaction, hole-cut, cementing, pore volume, carbonate cement content and porosity of the eroded pores) and reservoir physical properties, combining with the tectonic evolution, it is considered that the middle sandstone reservoir Physical properties are mainly controlled by carbonate cementation and dissolution. The physical properties of deep sandstone reservoirs are mainly controlled by late compaction, cementation and fractures; tectonic extrusion is the main reason for controlling late compaction and physical property changes. The results show that : From middle layer to deep sandstone reservoir, the correlation coefficient of porosity and permeability decreased from 0.79 to 0.35, the slope of correlation curve decreased from 0.24 to 0.09, and the permeability of deep sandstone base was between 0.01 and 0.10mD. From the necking shape, the point shape evolves into a sheet shape and the curved throat is the main type. The sandstone in the middle layer is weakly compacted and the later compaction development after the main cementation of carbonate is not obvious. The deep sandstone compaction strength and carbonate cementation Followed by significant late compaction.However, the degree of cementation of middle-deep sandstone is similar to that of the remaining intergranular pores and fractures.According to the reservoir control factors, it is found that the depth of the deep reservoir is more Large, relatively developed pores.