Deep stratigraphic framework and hydrocarbon resource potential in the Southern East China Sea Shelf Basin
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摘要:
东海陆架盆地是发育于西太平洋边缘的前中生代克拉通基础上的中、新生代坳陷-断陷-坳陷叠合型盆地，蕴藏着丰富的油气资源，但深层（上三叠统—白垩系）由于埋藏深，区域构造背景、地球物理场、构造演化复杂，温度场、压力场与应力场变化大，地质结构改造强烈，油气成藏过程复杂，影响了对盆地深层烃源岩与油气生、排、聚潜力综合评价。因此，本文在利用前人研究成果的基础上，综合应用钻井、地球物理和浙闽陆域资料，通过区域地震地质解释和井-震标定，将东海陆架盆地南部深层划分出上三叠统—中侏罗统、上侏罗统和白垩系3个二级构造层序，建立了深部层序格架和层序演化序列，明确了深部主要发育上三叠统—下侏罗统和下白垩统两套受海侵影响或海相泥页岩烃源岩，提出东海陆架盆地南部深层总生烃能力和平均资源丰度较大，具有可观的油气资源潜力，是今后东海深部油气勘探值得探索的重要领域。
Abstract:The East China Sea Shelf Basin is an Upper Triassic-Middle Jurassic depression, Upper Jurassic-Cretaceous and Paleogene faulted-depressions, Neogene depression superimposed basin developed on the basis of the Pre-Mesozoic craton with rich hydrocarbon resources. It is located in the South China Block on the southeastern margin of the Eurasian Plate. However, in the deep layers (referring to the Upper Triassic-Cretaceous), due to the deep burial depth, complex regional tectonic background, geophysical field, and tectonic evolution, large changes in temperature fields, pressure fields and stress fields, strong geological tectonic transformation, and complex hydrocarbon accumulation process, a systematic evaluation on source rocks and oil and gas resource potential of the basin has not been carried out. Therefore, on the basis of previous studies, the drilling, seismic, and adjacent onshore data in the Southern East China Sea Shelf Basin (SECSSB) were comprehensively analyzed through regional seismic-stratigraphy and well-seismic calibration, three second-level tectonic sequences in the deep layers of the SECSSB were clarified: the Upper Triassic to Middle Jurassic, the Upper Jurassic, and the Cretaceous. The deep sequence framework and stratigraphic sequence evolution were established. Two sets of transgression-affected or marine shale source rocks mainly develop in the upper Triassic-Lower Jurassic and Lower Cretaceous were clearly pointed out. In addition, it is suggested that the total hydrocarbon generation capacity and average resource abundance in the deep layers of the SECSSB are relatively large and have considerable potential for petroleum resources, and it is an important area worthy of deep stratigraphic exploration for oil and gas exploration in the SECSSB in the future.
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