南华北盆地新元古界—下古生界海相烃源岩评价  

Comprehensive analysis of Neoproterozoic and Lower Palaeozoic marine source rocks in southern North China Basin

作　　者：李振生[1] 李建勋 王创[1] 贾超 张交东[2] 

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009 [2]中国地质科学院,北京100037

出　　处：《天然气地球科学》2017年第11期1699-1713,共15页Natural Gas Geoscience

基　　金：国家自然科学基金(编号:41372194;41172117);中国地质调查局地质调查项目(编号:1211302108023-1)联合资助

摘　　要：南华北盆地是我国油气勘探历史较长,但仍未取得工业性突破的地区之一,新元古界—下古生界深层油气是值得深入探索的海相天然气新地层和新领域,从有机地球化学和沉积相的角度分析新元古界—下古生界的烃源岩条件,为下一步天然气勘探决策提供地质依据。有机地球化学评价表明南华北盆地新元古界—下古生界有机质类型为腐泥型(I型),热演化程度达到高—过成熟阶段,尚有一定的生气潜力;新元古界—下古生界包括6套区域性烃源岩层,青白口系刘老碑组差烃源岩、崔庄组差—好烃源岩和寒武系马店组好—很好烃源岩、张夏—崮山组及凤山组差—中等烃源岩的有效分布区为南华北盆地南缘及东南缘的较深水陆棚或开阔台地和次深海斜坡相沉积区;青白口系张渠组—魏集组及史家组差—很好烃源岩和中奥陶统差—中等烃源岩的有效分布区为东北部较深水台地以及西南部浅海陆棚相沉积区。马店组暗色泥页岩及泥质白云岩为最优的烃源岩,张渠组—魏集组碳酸盐岩和泥页岩、崔庄组泥页岩、刘老碑组泥页岩次之,中奥陶统、张夏组—崮山组盐岩及九里桥组—九顶山组碳酸盐岩为较差的烃源岩。Deep hydrocarbon resources in Neoproterozoic-Lower Paleozoic Erathem of southern North China Basin,which is one of the areas without industrial hydrocarbon accumulations discovered during a long history of oil and gas exploration,will be probably the new formation and domain worthy of further exploration of marine natural gas.In this paper,the comprehensive analysis of organic geochemistry and sedimentary facies of marine source rocks in Neoproterozoic and Lower Palaeozoic Erathem would provide a geological basis for decision on further natural gas exploration.It is suggested by organic geochemical evaluation that the organic matter was sapropel type（type I）with high to over mature stage of thermal evolution degree,and six sets of regional potential hydrocarbon source rocks were optimized,which is in the peak stage of natural gas generation at present.Effective hydrocarbon source rocks of Liulaobei and Cuizhuang formations of Qingbaikouan System,and Madian and Zhangxia-Gushan Formations of Cambrian System,which respectively were poor,poor-good,good-very good and poor-middle grade of source rocks,developed in southern and southeastern part of southern North China Basin which were sediments of deeper-water neritic shelf facies,open platform facies and bathyal slope facies;while that of Zhangqu-Weiji Formation of Qingbaikouan System and middle Ordovician,which respectively were poor-very good and poor-middle grade of source rocks,developed in the northeast part which were sediments of deeper-water open platform facies as well as neritic shelf facies.The best source rocks were mud shale and argillaceous dolomite of Madian Formation,the second were mud shale of Cuizhuang and Liulaobei Formations and carbonate and muddy mud shale of Zhangqu-Weiji Formation,and the poorer were carbonate of Zhangxia-Gushan Formation,middle Ordovician as well as Jiayuan-Jiudingshan Formation.

关 键 词：南华北盆地 新元古界-下古生界 海相 有效气源岩 有机地球化学 

分 类 号：TE122.115[石油与天然气工程—油气勘探]