Geological structure of the large section in eastern China's sea areas and its constraint on comprehensive stratigraphic division
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摘要:
本文利用实测的地质地球物理资料，在中国东部海域开展了地学大断面重磁震联合反演，系统研究了各构造单元的基底性质和地层结构，并以此为约束开展了海陆综合地层分区。研究认为，东海陆架盆地基底为元古宇和古生界，盖层发育5套构造层；南黄海盆地具有双重基底，盖层可以划分为8个构造层。东海陆架盆地以晚中生代燕山期以来的变形为主；南黄海盆地海相下构造层主要表现为挤压变形，陆相中构造层主要发育拉张作用形成各种构造样式。区内莫霍面深度稳定，一般在30 km左右，仅在勿南沙—中部隆起处上地幔略有抬高，总体上南部东海陆架盆地区莫霍面埋深要大于北部南黄海盆地—苏鲁造山带。将中国东部海域划分为2个地层大区，6个地层区和14个地层分区。大断面地层结构研究揭示，在南黄海海域和东海海域广泛发育中、古生代地层，巨厚的中—古生界为油气资源的形成与赋存提供了丰富的物质基础。
Abstract:Based on the geophysical and geophysical data collected in recent years,the authors carried out the joint gravity- magnetic-seismic inversion in eastern China's sea areas and studied the characteristics of the basement and geological structure of each structural unit systematically. Constrained by the joint interpretation,the authors carried out the unified sea-land stratigraphic regionalization and predicted the favorable oil- bearing prospective areas of Mesozoic. The basement of the East China Sea shelf basin is composed of Proterozoic and Paleozoic strata,and 5 sets of tectonic layers are developed in the caprock. The south Yellow Sea basin having dual basement and caprock feature can be divided into 8 tectonic layers. The East China Sea shelf basin is dominated by the late Mesozoic Yanshanian transformation. The lower tectonic layer of the Yellow Sea basin is mainly characterized by extrusion deformation while the middle tectonic layer is mainly characterized by multiple structural styles formed by extension. The depth of the Moho surface is stable in the study area,which is usually about 30 km. The upper mantle is slightly elevated in the Wunansha-middle uplift. The Moho depth in the East China Sea shelf basin is generally deeper than that in the South Yellow Sea Basin—Sulu orogenic belt. Eastern China's sea areas and their adjacent areas can be divided into 2 first level stratigraphic regions (Eurasian),6 second level stratigraphic regions and 14 third level stratigraphic regions. The study of large cross- section stratigraphic structure reveals that the Mesozoic and Paleozoic strata are widely developed in south Yellow Sea and the East China Sea. The thick Meso-Paleozoic strata provide a rich material basis for oil and gas formation and accumulation.
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表 1 中国东部海区及邻区地层和密度统计（据陈晓红等，2013；侯方辉等，2012）
Table 1. Statistics of stratigraphy and density in eastern China's sea areas and adjacent areas(after Chen Xiaohong et al., Hou Fanghui et al., 2012)
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表 2 中国东部海区及邻区磁化率统计（据陈晓红等，2013；侯方辉等，2012）
Table 2. Statistics of magnetic susceptibility in eastern China's sea areas and adjacent areas(after Chen Xiaohong et al., Hou Fanghui et al., 2012)
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表 4 中国东部海域及相邻陆域综合地层分区方案
Table 4. Comprehensive stratigraphic regionalization scheme for eastern China's sea areas and adjacent land areas
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