Hydrocarbon preservation conditions in Mesozoic–Paleozoic marine strata in the South Yellow Sea Basin
Hydrocarbon preservation conditions in Mesozoic–Paleozoic marine strata in the South Yellow Sea Basin
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DOI：
10.1016/j.ngib.2017.05.013
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发表时间：
2017-11
影响因子：
3.3
通讯作者：
Jie Liang;Jie Liang;Peng-hui Zhang;Jianwen Chen-;Jian-ming Gong;Yong Yuan
中科院分区：
文献类型：
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作者：
Jie Liang;Jie Liang;Peng-hui Zhang;Jianwen Chen-;Jian-ming Gong;Yong Yuan
南黄海盆地中、古生界海相地层普遍发育，厚度大，具有多源、多期成藏的特点，为大型油气田的形成提供了物质基础。然而，在这方面没有取得实质性突破。综合前人研究成果，认为该叠合盆地的复杂构造格局是多期构造运动共同作用的结果，后期的叠合改造或破坏了有利的油气保存静态条件。因此，油气保存条件是制约该区海相油气勘探取得突破的关键因素。从构造运动、物源条件、盖层特征、岩浆活动、水文地质和水文地球化学特征等方面综合分析了南黄海盆地海相地层油气保存条件。研究表明，南黄海盆地复杂的构造格局是多期次构造事件的结果，区域烃源岩的发育演化主要受两个阶段的控制，中-古生代海相盆地稳定演化阶段和中-新生代构造格局转换成盆阶段），从而呈现出油气差异保存的特征。构造改造较弱、优质厚层烃源岩发育、盖层垂向封闭能力强、岩浆活动较弱、水文地质条件封闭是该区海相油气保存的有利条件。认为南黄海盆地中部崂山隆起构造稳定，断裂活动和岩浆活动较弱，油气保存条件较好。此外，区内还发育了多个石油地质条件良好、生储盖组合完整的大型构造圈闭。因此，该区是该盆地最有希望勘探古生界海相油气的地区。
In the South Yellow Sea Basin, Mesozoic–Paleozoic marine strata are generally well developed with large thickness, and they are characterized by multi-source and multi-stage hydrocarbon accumulation, providing a material basis for the formation of large-scale oil and gas fields. However, no substantial breakthrough has been made in this area. Based on previous research results, the complex tectonic pattern of this superimposed basin was formed by multi-stage tectonic movements and the favorable static conditions for hydrocarbon preservation were reworked or destroyed by later superimposition. Therefore, hydrocarbon preservation conditions are the key factors for restricting the breakthrough of marine oil and gas exploration in this area. In this paper, hydrocarbon preservation conditions of marine strata in the South Yellow Sea Basin were comprehensively analyzed from many aspects, such as tectonic movement, source conditions, caprock characteristics, magmatic activities, and hydrogeological and hydrogeochemical characteristics. It is indicated that the complex tectonic pattern of the South Yellow Sea Basin is resulted from tectonic events in multiple stages, and the development and evolution of regional source rocks are mainly controlled by two stages (i.e., the stable evolution stage of Mesozoic–Paleozoic marine basin and the Mesozoic–Cenozoic tectonic pattern transformation and basin formation stage), so the characteristics of differential oil and gas preservation are presented. Besides, better marine hydrocarbon preservation preconditions in this area are weaker tectonic reworking, development of high-quality thick source rocks, good vertical sealing capacity of caprocks, weaker magmatic activity and confined hydrogeological conditions. It is concluded that the Laoshan Uplift in the central part of the South Yellow Sea Basin is structurally stable with weaker faulting and magmatic activities, so it is better in oil and gas preservation conditions. Besides, several large-scale structural traps with good petroleum geological conditions and complete source–reservoir–caprock assemblages are developed in this area. Therefore, this area is the most promising region for Paleozoic marine oil and gas exploration in this basin.