Distribution of residual Mesozoic basins and their exploration potential in the western depression zone of East China Sea Shelf Basin
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摘要:
东海陆架盆地发育在中生代晚期古太平洋板块俯冲背景下，是中国近海面积最大的中、新生代沉积盆地，目前的油气发现均来自于新生界，而中生界的分布特征及其资源潜力尚缺乏足够的认识。前人研究表明，东海陆架盆地西部坳陷带的中生界遭到后期不同程度的构造抬升和剥蚀，总体表现为残留盆地的分布特征；而东部坳陷带的中生界缺乏钻井直接揭示，受制于中深层地震的资料品质，识别难度较大。本文从东海陆架盆地西部坳陷带钻遇中生界的井震标定出发，通过区域地震剖面的中生界地震相分类和识别，划分了中生界侏罗系和白垩系的构造层序格架，梳理了中生界残留盆地的结构和平面分布特征，并结合基本石油地质条件分析，认为东海陆架盆地中生界具有不可忽视的勘探潜力。
Abstract:The East China Sea Shelf Basin is the largest Meso-Cenozoic sedimentary basin in the area offshore China formed by the subduction of the paleo-Pacific Plate in late Mesozoic. Current oil and gas discoveries are mainly from the Cenozoic deposits, and the distribution patterns and resource potentials of the Mesozoic remain unclear. Previous studies show that, the Mesozoic strata in the western depression zone of the East China Sea Shelf Basin have uplifted and been denuded to some extent in later stage suggesting the distribution pattern of a residual basin, and the eastern depression zone remain unclear due to lack of drilling evidence and the low quality of the seismic data from the medium and deep parts. Based on the well-seismic calibration for the western depression zone and the classification and identification of the Mesozoic seismic facies in the regional seismic profiles, this paper divided the stratigraphic sequences of the Jurassic and Cretaceous, summarized the structure and plane distribution patterns of the residual Mesozoic basins, and analyzed the basic factors which control the petroleum accumulation. The result suggests that the exploration potential of the Mesozoic in the East China Sea Shelf Basin should not to be ignored.
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