| 东海陆架盆地形成演化及油气成藏关键地质问题 |
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| 引用本文： | 钟锴,朱伟林,高顺莉,付晓伟.东海陆架盆地形成演化及油气成藏关键地质问题[J].地球科学,2018,43(10):3485-3497. |
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| 作者姓名： | 钟锴 朱伟林 高顺莉 付晓伟 |
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| 作者单位： | 1.同济大学海洋地质国家重点实验室, 上海 200092 |
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| 基金项目： | 国家科技重大专项2016ZX05027-001-008海洋地质国家重点实验室自主课题MG20180101国家自然科学基金项目41702228 |
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| 摘 要： | 东海陆架盆地是中国近海规模最大的边缘海盆地，历次资源评价均认为其具有丰富的油气资源潜力，但迄今为止，其油气探明程度仍相对较低.因此，有必要对东海陆架盆地从区域构造背景、盆地形成机制到烃源潜力、沉积储层等油气成藏关键问题展开全面的重新研究和认识.通过对东海及其周缘构造单元基础地质资料、研究现状及存在问题的梳理，提出东海陆架盆地中生代盆地原型及其与周边区域构造演化、晚中生代-新生代裂谷盆地差异演化及其成因、沉积充填特征及其控制因素是研究东海陆架盆地形成演化的3个关键的科学问题.因各次级沉降单元差异演化，造成各区域油气成藏的关键地质要素也存在明显差异，其中储层因素是以始新统-渐新统沉积为主的东部坳陷带油气成藏的关键，而烃源岩条件是解答古新统-始新统沉积为主的西部坳陷带油气成藏的基础性问题.
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| 关 键 词： | 东海陆架盆地 丽水凹陷 西湖凹陷 油气成藏 石油地质 |
| 收稿时间： | 2018-05-01 |
Key Geological Questions of the Formation and Evolution and Hydrocarbon Accumulation of the East China Sea Shelf Basin |
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| Abstract: | The East China Sea Shelf Basin(ECSSB) is the largest basin in the offshore China. However, there are not many progresses in oil and gas exploration due to the poor understanding of key issues of the hydrocarbon accumulation because of the lack of clear recognition of some basic geological problems, though it has been considered to be rich in hydrocarbon resources by all previous resource assessments. According to the geological data, previous studies, and existing problems of ECSSB and its adjacent regions, we propose in this paper that three key problems concerning the formation and evolution of the ECSSB are the Mesozoic basin archetype and the tectonic evolution of its peripheral regions, the differential evolution and essential reasons of the Late Mesozoic to Cenozoic rift, sedimentary filling characteristics and its controlling factors. Because of the different evolution histories of subbasins in ECSSB, there are significant differences of the key geological factors related to hydrocarbon accumulation. Thus the reservoir problem is the critical factor to affect the oil and gas accumulation in the east depression zone which mainly deposits Eocene-Oligocene sediments and the hydrocarbon potential of the source rock is the essential question about the oil-gas exploration. |
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