STRUCTURAL DIVISION OF MARINE MESOZOIC-PALEOZOIC IN LOWER YANGTZE REGION AND ITS SIGNIFICANCE FOR PETROLEUM EXPLORATION TARGETS
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摘要: 基于对下扬子区海相中、古生界构造及沉积沉降特征的研究, 以影响和反映构造稳定及晚期生烃的基底性质、构造变形特征、印支面埋深、沉积沉降中心迁移特征等为依据, 将下扬子区划分为5个一级、17个二级地质结构区。以构造稳定、有效保存及晚期生烃、晚期成藏等为评价标准, 综合评价南黄海中部晚期隆起稳定区(Ⅰ2)、江都-东台-南黄海南部晚期沉降深冲断区(Ⅰ3)、泰兴-海安晚期沉降深冲断区(Ⅱ1)、南通-南黄海南部晚期沉降浅推覆区(Ⅱ2)及太湖晚期沉降浅推覆区(Ⅱ4)为下古生界油气勘探有利区; 南黄海北部晚期沉降深冲断区(Ⅰ1)、江都-东台-南黄海南部晚期沉降深冲断区(Ⅰ3)、滨海-大丰晚期沉降深下古卷入区(Ⅰ4)和泰兴-海安晚期沉降深冲断区(Ⅱ1)为上古生界油气勘探有利区; 南黄海北部晚期沉降深冲断区(Ⅰ1)、滨海-大丰晚期沉降深下古卷入区(Ⅰ4)、金湖-高邮晚期沉降深下古卷入区(Ⅰ5)及泰兴-海安晚期沉降深冲断区(Ⅱ1)为古潜山油气勘探有利区。研究对于该区海相中古生界勘探选区具有重要意义。Abstract: According to the basement features, structural deformation, depth of the Indo-surface and characteristics of depocenters and subsidence centers, the Lower Yangtze region has been divided into 5 first-order geological structure zones and 17 second-order zones mainly In terms of structural stability, effective preservation, and late-stage hydrocarbon generation, the second-order zones have been assessed.The Lower Paleozoic favorable zones for exploration include the late-stage uplifting stable region in centeral part of southern Yellow Sea (Ⅰ2), the late-stage subsiding deep thrust region in Jiangdu-Dongtai-southern part of the South Yellow Sea (Ⅰ3), the late-stage subsiding deep thrust region in Taixing-Haian (Ⅱ1), the late-stage subsiding lower nappe region in Nantong-south part of South Yellow Sea (Ⅱ2), and the late-stage subsiding lower nappe region around the Taihu Lake (Ⅱ4); the Upper Paleozoic favorable zones for exploration include, the latestage subsiding deep thrust region in North Yellow Sea (Ⅰ1), the late-stage subsiding deep thrust region in Jiangdu-Dongtai-south part of South Yellow Sea, (Ⅰ3), the late-stage subsiding deep Lower Paleozoic-involved thrust region in Binhai-Dafeng (Ⅰ4), the late-stage subsiding deep thrust region in Taixing-Haian (Ⅱ1); the most favorable zones for Indo-surface exploration include the late-stage subsiding deep thrust region in North Yellow Sea (Ⅰ1), the late-stage subsiding deep Lower Paleozoic-involved thrust region in Binhai-Dafeng (Ⅰ4), the late-stage subsiding deep Lower Paleozoic-involved thrust region in Jinhu-Gaoyou (Ⅰ5), and the late-stage subsiding deep thrust region in Taixing-Haian (Ⅱ1).
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图 1 巢湖市银屏山地区构造剖面图
(示下古卷入型构造)
Figure 1. Section across Yinpingshan area in Chaohu City, showing Lower Paleozoic-involved structure
图 3 冲断型和稳定型构造剖面图
Figure 3. Profile sections showing the thrust structure and stable structure
图 5 下扬子区下古生界(a)及中三叠统-中侏罗统(b)厚度图
Figure 5. Diagram showing thickness of Lower Paleozoic (a) and Middle Triassic-Middle Jurassic (b)
图 6 下扬子区海相中、古生界地质结构分区图
Figure 6. A map showing Geological structure zoning of marine Mesozoic-Paleozoic in Lower Yangtze region
表 1 下扬子区海相中、古生界构造变形类型及特征
Table 1. Types and characteristics of structural deformation for marine Mesozoic-Paleozoic erathem in Lower Yangtze region
表 2 下扬子区海相中、古生界地质结构分区
Table 2. Geological structure zones of marine Mesozoic-Paleozoic erathem in Lower Yangtze region
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