论文部分内容阅读
陕北英旺探区三叠系延长组长8油层为典型低孔、特低渗储层,该类储层成岩作用类型非常复杂,在埋藏成岩过程中各种成岩作用对砂岩的原生孔隙的保存和次生孔隙的发育都产生重要影响,从而控制了储层物性纵横向变化;强烈的压实作用及胶结作用导致原生孔隙丧失殆尽,是形成特低孔渗储层的主要原因,而较弱的晚期溶蚀作用,特别是方解石溶解对储层的改善发挥较大作用,才使英旺探区延长组长8油层发育部分亮点储层,成为有利的储集-成岩相带。
Chang 8 reservoir of Triassic Yanchang Formation of Triassic Yanwang Exploration Area in northern Shaanxi Province is a typical low-porosity and ultra-low permeability reservoir. The type of diagenesis of this type of reservoir is very complicated. During the process of burial diagenesis, Storage and secondary pore development have a significant impact, thereby controlling the physical and chemical properties of vertical and horizontal changes; strong compaction and cementation lead to the loss of primary porosity, is the formation of ultra-low porosity and permeability of the main reservoir, and Weak late dissolution, especially calcite dissolution plays a greater role in reservoir improvement, which makes it possible for Yingwang exploration area to extend some of the bright spot reservoirs in the Chang 8 reservoir and become a favorable reservoir-diagenetic facies belt.