摘要
渤海石臼坨凸起沙河街组发育一套湖相混积岩岩性段,呈现出良好的油气显示。利用显微岩石与矿物学观察、扫描电镜、电子探针、碳氧同位素地球化学、气液包裹体温度分析等方法技术,研究总结了渤海石臼坨凸起古近系沙河街组混积岩的成岩作用和孔隙演化特征。沙河街组混积岩储层主要为陆源碎屑质-碳酸盐混积岩,储集空间主要为残余原生粒间孔和生物体腔孔,为高孔高渗储层。储层中发育的成岩作用主要有:①压实作用;②胶结作用,主要为颗粒包壳、孔隙衬垫与充填和交代白云石等自生白云石胶结作用,自生白云石具有典型的多期生长特征;③溶蚀作用,主要为陆源碎屑中的长石、岩屑等的溶蚀,其次是早期衬垫白云石的溶蚀。伴随成岩演化,储层孔隙度由初始的40%演变到现今的22%。早期孔隙衬垫白云石、长石溶蚀对古近系沙河街组混积岩中的有利储层发育具有重要控制作用。
A set of lacustrine mixed siliciclastic-carbonate sediments was developed in the Shahejie Formation of Shijiutuo uplift, Bohai Sea, showing a good hydrocarbon display. This paper summarizes the diagenesis and pore evolution characteristics of the mixed siliciclastic-carbonate sediments in the Shahejie Formation of the Paleogene based on the polarized light microscopy observation, scanning electron microscopy, electron probe, carbon and oxygen isotope geochemistry, and gas-liquid inclusions temperature analysis. The rock types of the Shahejie Formation reservoir are mainly mixed siliciclastic-carbonate sediments.The hydrocarbon pore volume is mainly the residual primary intergranular pores and the intrafossil pores, which is the high porous and high permeability reservoir.The main diagenesis in the study area is compaction, granulated coating, pores lining, filling and metasomatic dolomites and other authigenic carbonate minerals, authigenetic dolomite, showing a multi-period characteristics.The dissolution is mainly the dissolution of feldspars, lithic fragment, followed by the early liner dolomite dissolution. Along with diagenetic evolution, reservoir porosity evolved from the initial 40% to 22% of the present. Early pores lining dolomite and feldspar dissolution play an important role in controlling the favorable reservoir development in the mixed siliciclastic-carbonate sediments of the Shahejie Formation in the Paleogene.
作者
齐玉民
章顺利
吴家洋
吕正祥
Qi Yumin;Zhang Shunli;Wu Jiayang;Lü Zhengxiang(Bohai Central Laboratory,CNOOC Experimental Center,CNOOC Ener Tech-Drilling &Production Co.,Tianjin 300452,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China)
出处
《地质科技情报》
CAS
CSCD
北大核心
2019年第3期63-69,共7页
Geological Science and Technology Information
基金
"十二五"国家重大科技专项课题"近海大中型油气田形成条件与分布"(2011ZX05023-006)
关键词
成岩作用
孔隙演化
混积岩
沙河街组
石臼坨凸起
渤海
diagenesis
pore evolution
mixed siliciclastic carbonate sediment
Shahejie Formation
Shi jiutuo Uplift
Bohai Sea
