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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。
The South China North Basin is one of the areas where oil and gas exploration in China has a long history but has not yet achieved industrial breakthrough. The Neoproterozoic-Lower Paleozoic deep oil and gas are new marine strata and new fields worth exploring in depth. Geochemistry and sedimentary facies analysis of the Neoproterozoic-Lower Paleozoic source rock conditions, in order to provide the geological basis for the next step of natural gas exploration and decision-making. Organic geochemical evaluation shows that the Neoproterozoic-Lower Paleozoic organic matter type of South China North Basin is sapropel type (I type), and the degree of thermal evolution reaches high-over mature stage, and has certain potential for gas generation. Neoproterozoic- The Lower Paleozoic consists of 6 sets of regional source rocks, the Liubaobei Formation source rocks of the Qingbaikou Formation, the Cuihuang Formation difference-good source rocks and the Cambrian Maadian Formation, which are well-well source rocks and Zhangxia - The effective distribution areas of the Dangshan Formation and Fengshan Formation differential-intermediate source rocks are the deeper continental shelf or open platform and secondary deep-sea slope facies in the southern margin and southeastern margin of the South China North basin. The Qingshankou Formation- The difference between the Weiji Formation and the Shihjian Formation - well source rocks and the middle Ordovician differential - moderate source rock are distributed in the deeper water platform in northeastern China and the shallow continental shelf sedimentary region in southwest China. The dark mud shale and muddy dolomite in Maadian Formation are the best source rocks, Zhangqu Formation-Weiji Formation carbonate rock and shale, Cuizhuang Formation shale, Liu Laobei mud shale Secondly, the carbonate rocks in Middle Ordovician, Zhangxia Formation-Dangshan Formation and Jiuliqiao Formation-Jiudingshan Formation are the poorer source rocks.