渤海湾盆地沧东凹陷孔二段页岩油形成条件及富集主控因素  

Geological conditions for shale oil formation and the main controlling factors for the enrichment of the 2^(nd) member of Kongdian Formation in the Cangdong Sag,Bohai Bay Basin

作　　者：周立宏[1] 蒲秀刚[1] 肖敦清[1] 李洪香[1] 官全胜[1] 林伶[1] 曲宁[1] Zhou Li-hong;Pu Xiu-gang;Xiao Dun-qing;Li Hong-xiang;Guan Quan-sheng;Lin Ling;Qu Ning(Petro China Dagang Oilfield Comany,Tianjin 300280,China)

机构地区：[1]中国石油大港油田分公司,天津300280

出　　处：《天然气地球科学》2018年第9期1323-1332,共10页Natural Gas Geoscience

基　　金：中国石油天然气集团科技专项"大港油区大油气田勘探开发关键技术研究"(编号:2014E-06-03)资助

摘　　要：渤海湾盆地沧东凹陷孔二段属于淡水—半咸水封闭型坳陷湖盆沉积,沉积相带沿湖盆区呈环带状展布,外环为三角洲前缘常规砂岩发育带,内环为大面积分布的细粒沉积岩相区,优质烃源岩发育,具备良好的页岩油形成条件,分布面积为750km2,厚度为50～300m。岩性主要为细粒含长石、石英沉积岩、细粒混合沉积岩、碳酸盐岩三大岩类组成,白云岩物性较好,孔隙度平均为5.8%,其次是细粒混合沉积岩,孔隙度平均为3.3%,细粒含长石、石英沉积岩最低,孔隙度平均为3.1%,微裂缝均发育。页岩有机质丰度高,TOC值为1.89%～5.41%,S1+S2值为9.03～67mg/g,具有早生早排、生烃周期长等特点。页岩油源储共生、持续充注、优势岩石组构相决定甜点分布区。井震结合,预测甜点体面积为260km2,多口井钻探获得工业油流,展示了页岩油良好的勘探前景。The 2^nd member of Kongdian Formation（Kong 2 member）in Cangdong Sag of Bohai Bay Basin belongs to the fresh-brakish depression lake basin,which generally distributed in annuluses along the lake basin.The outer circle is characterized by conventional sandstone of delta front,the inner circle is characterized by a large area of fine-grained sediments.The hydrocarbon source rocks have very good conditions for shale oil.The oil source rocks are widely covered with an area of 750km^2 and a thickness of about 50-300m.The lithology is mainly composed of fine-grained felsic sedimentary rocks,fine-grained mixed sedimentary rocks and carbonate rocks,which are all enriched in fractures.The carbonate rocks have good physical character,with an average porosity of 5.8%,closely followed by the fine-grained mixed sedimentary rocks with an average porosity of 3.3%,followed by the fine-grained felsic sedimentary rocks with 3.1%.The black shales are characterized by high content of organic matters generated and discharged early,and long hydrocarbon generation period with 1.89%-5.41% TOC and 9.03-67mg/g S1＋S2.And the distribution area of the desserts predicted reached 260km^2,which is due to the symbiotic source rocks and bodies,the continuous charging and the advantage rock texture.Combining the well logging with seismic,high yield layers have been found at the stratum in many wells and revealed a good exploration prospect for the unit.

关 键 词：孔二段 页岩油 优势组构相 甜点体 沧东凹陷 

分 类 号：TE122.3[石油与天然气工程—油气勘探]