南黄海盆地下古生界油气地质条件与勘探前景  

Hydrocarbon geological conditions and exploration prospects of Lower Paleozoic in the South Yellow Sea Basin

作　　者：张鹏辉 付奕霖 梁杰 陈建文[2,3] 张银国 鲍衍君[1] 薛路 李慧君[2,3] ZHANG Penghui;FU Yilin;LIANG Jie;CHEN Jianwen;ZHANG Yinguo;BAO Yanjun;XUE Lu;LI Huijun(College of Oceanography,Hohai University,Nanjing 210098,Jiangsu,China;Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266071,Shandong,China;Qingdao Institute of Marine Geology,China Geological Survey,Qingdao 266071,Shandong,China)

机构地区：[1]河海大学海洋学院,江苏南京210098 [2]青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛266071 [3]中国地质调查局青岛海洋地质研究所,山东青岛266071

出　　处：《地质通报》2021年第2期243-251,共9页Geological Bulletin of China

基　　金：中国地质调查局项目《崂山隆起构造沉积条件地质调查》(编号:DD20190818);《南黄海油气资源调查》(编号:DD20160152);中央高校基本科研业务费项目《下扬子地块早寒武世古海洋环境演化》(编号:B200202144);国家自然科学基金项目《南黄海崂山隆起二叠系储层油气成藏破坏与流体演化过程还原研究》(批准号:42076220);《下扬子地区下寒武统深水陆棚相富有机质泥页岩差异性成岩演化过程及其对孔隙发育的控制作用》(批准号:41702162);《南黄海崂山隆起中南部海底渗漏烃类源区示踪与运移路径重建》(批准号:41776075)。

摘　　要：钻探、包裹体分析及地球化学探测表明,南黄海盆地深部海相中—古生界存在油气充注过程,具备较好的油气资源潜力。基于南黄海盆地最新的地震资料解释成果和邻区下扬子陆域最新的钻井资料的充分认识,通过对南黄海中—古生代海相盆地的构造区划、下古生界成藏要素及油气成藏组合的系统分析,阐述了下古生界油气地质条件与勘探前景。研究结果表明:(1)南黄海盆地是受多期构造运动叠加改造形成的残留盆地,下古生界构造形变作用较弱,地层保存较完整,盆地中部崂山断隆带的高石稳定带构成了下古生界构造相对稳定带;(2)下古生界油气地质条件较优越,下寒武统烃源岩厚度较大且有机质含量较高,以Ⅰ型干酪根为主,中寒武统—奥陶系多发育交代白云岩和颗粒灰岩,可作为较好的储集层,上奥陶统—下志留统厚层泥质岩广泛发育,具备较好的封盖能力,可作为一套区域性盖层;(3)下古生界生储盖组合配置良好,相对稳定的高石稳定带发育多个大型构造圈闭且存在油气充注,构造圈闭与油气形成时空匹配较好,后期构造破坏较弱,油气保存条件较好,可作为南黄海盆地深部海相油气勘探的有利区带。Drilling,inclusion analysis and geochemical prospecting indicate that oil and gas charging process exists in the deep marine Mesozoic-Paleozoic strata in the South Yellow Sea Basin,which is endowed with a good potential of oil and gas resources.Based on the latest seismic data interpretation of the South Yellow Sea Basin and fully understanding of the latest drilling data in its adjacent Yangtze Platform,the geological conditions and exploration prospects of oil and gas in the Lower Paleozoic are described through systematic analysis on tectonic division of the Mesozoic-Paleozoic marine basins,hydrocarbon accumulation elements and assemblages of Lower Palaeozoic.The results show that:a.The South Yellow Sea Basin is a residual basin formed by the superposition and reconstruction resulting from multi-stage tectonic movements.As the Lower Paleozoic tectonic deformation is weak,the strata are relatively well preserved.The Gaoshi stabilized zone of the Laoshan fault uplift in the middle of the basin constitutes the Lower Paleozoic tectonic stable zone.b.Palaeozoic strata possess relatively superior geological conditions for oil and gas resources,of which the Cambrian source rock is characterized by great thickness and high contents of organic substance dominated by typeⅠkerogen.Metasomatic dolomite and granular limestone are mainly developed in Middle Cambrian to Ordovician,which can be used as better reservoirs.The thick argillaceous rocks of Upper Ordovician to Lower Silurian are widely developed and have good sealing ability,which can be used as a set of regional caprocks.The source-reservoir-caprock combination is well developed in Lower Paleozoic,and several large structural traps and hydrocarbon charging exist in the Gaoshi stable zone.As the structural traps match well with the formation of oil and gas in time and space,and the late structural destruction is relatively weak,the oil and gas preservation conditions are good.Therefore,it can be a favorable area for marine oil and gas exploration in South Yellow

关 键 词：下古生界 油气地质条件 勘探潜力 构造区划 南黄海盆地 

分 类 号：P534.4[天文地球—古生物学与地层学] P618.130.2[天文地球—地质学]