摘要
渤中25-1油田沙河街组沙三段储层主要由岩屑长石砂岩和长石岩屑砂岩组成,现今埋藏深度为3 300~3 800 m,处于中成岩演化阶段.成岩过程中,压实、胶结和溶蚀作用对储层物性的影响较大,形成了现今的中孔、低渗储层.沉积背景和成岩演化控制了该区沙三段的储层物性.重力流沉积背景导致储层原生孔隙不发育,杂基含量高;后期成岩演化过程中,强压实、强胶结和弱溶蚀作用进一步降低了储层物性.相对优质储层分布在近端扇砂体内,因此,近端扇为有利储层发育区.
The third member of Shahejie Formaiton in Bozhong 25-1 oilfield is consisted of lithic arkose and feldspathic litharenite, with the current burial depth of 3 300-3 800 m, and the diagenetic evolution reached the middle diagenetic stage. During the diagenetic process, the reservoir physical properties were mainly changed by compaction, cementation and dissolution, and became medium porosity and low permeability reservoir. The reservoir properties were mainly controlled by sedimentary background and diagenetic evolution. Firstly, the gravity flow sedimentary background caused the less primary pores and plenty matrix; secondly, the intense compaction and cementation and weak dissolution caused the medium porosity and low permeability. The relatively high quality reservoir mainly developed in proximal deposited sand bodies, where the reservoir physical properties are high.
出处
《岩性油气藏》
CSCD
2014年第3期11-16,21,共6页
Lithologic Reservoirs
基金
国家自然科学基金项目"砂泥成岩系统内成岩物质交换及其对砂岩溶蚀和胶结的影响"(编号:41302108)
国家重点基础研究发展计划(973)项目子课题"中国西部叠合盆地深部有效碎屑岩储层成因机制与发育模式"(编号:2011CB201104)
中国石油大学(北京)科研基金"不同类型盆地内砂岩孔隙与物性演化研究"(编号:KYJJ2012-01-18)联合资助
关键词
低渗储层
重力流
成岩作用
沙河街组
渤中25-1油田
low permeability reservoir
gravity flow
diagenesis
Shahejie Formation
Bozhong 25-1 oilfield