CLASSIFICATION AND TECTONIC CHARACTERISTICS OF BURIED HILLS IN THE SOUTH YELLOW SEA BASIN
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摘要: 南黄海是下扬子的主体,奠基于晋宁期变质基底之上,构造演化历经南华纪-早、中三叠世海相地层发育期、晚白垩世-古近纪箕状断陷发育期和新近纪-第四纪坳陷发育期,为一典型地台-断陷-坳陷多层结构的复合盆地。盆地历经多次构造运动改造,古潜山发育,类型多样。在总结前人对古潜山研究的基础上,结合南黄海新近采集的二维地震剖面,对该地区古潜山类型进行了系统划分,并对典型古潜山的构造特征及生储盖匹配关系进行了初步描述。根据成因划分为剥蚀型潜山、拉张型潜山、挤压型潜山和复合型潜山四大类,每一类又可根据形态划分出剥蚀残丘型潜山、拉张翘倾断块型潜山、拉张断阶型潜山、拉张断垒型潜山、挤压褶皱型潜山、拱张褶皱型潜山和褶皱-断块复合型潜山等类型。南黄海盆地古潜山的发育具有分带性,按盆地中潜山的构造位置,分为凸起潜山带、陡坡潜山带、洼陷潜山带和缓坡潜山带,每一构造带发育了不同类型潜山。研究表明南黄海古生界和中生界古潜山数量众多,规模较大,是南黄海地区实现油气突破的一种重要油气藏类型。Abstract: The South Yellow Sea Basin, built upon the pre-Nanhua metamorphic basement of the Lower Yangtze platform, is a polycyclic basin with a type of sandwich architecture. The geologic evolution of the basin can be divided into three stages:the Nanhua-early and middle Triassic marine basin stage, the late Cretaceous-Paleogene graben fault basin stage and the Neogene-Quaternary depression basin stage. Buried hills are well developed due to complicated geological evolution of the Basin. Based on the former researches on buried hill classification and combined with the interpretation results of seismic profiles, this paper systematically studied the types of buried hills in the South Yellow Sea Basin and described the tectonic characteristics of typical buried hills. According to origin, buried hills can be divided into erosional, extensional, compressive and complex types. Based on shape, each type of buried hills could be further divided into erosional remnant, tilted fault block, step-fault block, fault horst, compressive fold, arch fold and fold-fault block hills. Buried hills are distributed in a zonal pattern in the basin. According to the structural position in the basin, a fault depression basin can be divided into convex buried hill belt, inner depression buried hill belt, steep slope buried hill belt and gentle slope buried hill belt. There are many types of buried hills in each buried hill belt. The researches indicated that Paleozoic and Mesozoic buried hills are well developed in the South Yellow Sea Basin and could be an important type of reservoir.
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Keywords:
- buried hill /
- type /
- marine basin /
- tectonic characteristics /
- South Yellow Sea Basin
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