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针对南黄海海域油气勘探缺乏揭示古生界钻井样品资料的窘况,对邻近陆区2个典型露头剖面进行了调查研究。这2个剖面分别为南京幕府山的下古生界寒武系陆相泥岩和安微巢湖的上古生界二叠系海相灰岩,都呈深灰黑色;前者是当前下扬子陆区页岩气勘探重点研究层系;后者出露面积较大,似臭鸡蛋味浓烈,为含硅碳酸盐岩,俗称“臭灰岩”。通过系统油气地球化学测试,证实其均为优质烃源岩;岩石物性测试结果表明,后者还可为优质储集岩。由于古生代下扬子地块具有地台性质,沉积体系向南黄海海区自然延伸沉积,因此,利用这些来自陆区露头地质剖面的珍贵样品推测,二者均可作为南黄海盆地尤其是南部坳陷的潜在主力烃源岩,以期为相应的油气勘探评价提供借鉴。
In view of the lack of revealing the data of drilling samples in the Paleozoic in the southern Yellow Sea, two typical outcrop sections of the adjacent land area were investigated. The two profiles are the Lower Paleozoic Cambrian continental mudstone in Nanjing Mufu Mountain and the Upper Paleozoic Permian marine limestone in Anweichao Lake, all of which are dark gray and black; the former is the current Lower Yangtze Plateau The key research area of the gas exploration is the latter, which has a large exposed area and may smell like a rotten egg. It is a siliceous carbonate rock commonly known as “stink limestone”. Through the systematic oil-gas geochemical tests, it is confirmed that they are all high-quality source rocks; petrophysical test results show that the latter can also be a high-quality reservoir rock. Because of the platform characteristics of the Lower Paleozoic block in the Paleozoic, the sedimentary system extends naturally to the southern Yellow Sea. Therefore, using these precious samples from the outcrop geological profile of the continental depression, both of them can be used as the basis of the South Yellow Sea Basin, especially the southern depression Potential main source rocks, with a view to provide reference for the corresponding evaluation of oil and gas exploration.