摘要
依据鹿乡断陷岩心、薄片、扫描电镜、X射线衍射及有机包裹体等资料，研究了双阳组储集岩岩石学特征、成岩作用与孔隙演化；运用BasinMod软件进行了地层埋藏史与热史模拟，恢复了双阳组致密储层孔隙演化史；测算了鹿乡断陷成油峰期砂岩可保存孔隙度。结果显示：鹿乡断陷主要经历了压实、胶结、交代、溶蚀4个成岩期，压实和胶结作用是降低孔、渗性能的主要因素。36．5Ma以前，地层以压实与胶结作用为主，双阳组孔隙度下降了近13％；36．5～30．0Ma有机质成熟，深部储集岩中硅酸盐与碳酸盐类成岩矿物大量溶解，使溶蚀段孔隙度回升至25%左右，为油气储集提供了良好的次生孔隙空间；10Ma以后，双阳组地层暂时性抬升而形成微裂隙，此时深部热液沿裂隙侵入造成了裂缝填积、再胶结及白云岩化，但深部双阳组白云岩化作用弱，储集岩孔隙度继续下降。
Based on the data of cores, thin slices, scanning electron microscope and x-ray diffraction, this paper studied the reservoir rock characteristics, diagenesis and pore evolution in Luxiang Fault Depression. It also analysed the burial history and thermal history using the BasinMod software, resumed the pore evolution history of Shuangyang Formation and calculated the oil-generatied peak period holding porosity firstly. The result reveals four diagenesis stages in Luxiang Fault Depression. compaction, cementation, metasomasis and dissolution. Compaction and cementation are the main cause for the porosity decrease. Before 36.5 Ma, the main diagenesis was compaction and cementation,with the porosity decreased by 13% of Shuangyang Group. In 36.5--30.0 Ma, organic material became mature, the diagenesis minerals dissolution of silicate and carbonate caused the porosity to increase to 25%. This provided secondary pore space for oil accumulation. After 10Ma, microfracture grew because of Shuangyang group temporary uplift,and deep hydrothermal fluid intruded along microfracture. Porosity decreased because of the recementation and mineral filling caused by deep hydrothermal fluid.
出处
《地质科技情报》
CAS
CSCD
北大核心
2009年第2期81-86,共6页
Geological Science and Technology Information
基金
中国石油天然气股份有限公司吉林油田分公司重大项目"伊通盆地构造
沉积及油气成藏综合评价"
关键词
伊通地堑
鹿乡断陷
双阳组
致密储层
成岩作用
孔隙演化
Yitong Graben
Luxiang Fault Depression
Shuangyang Formation
tight reservoir
diagenesispore evolution
