HYDROCARBON ACCUMULATION CHARACTERS AND EXPLORATION PROSPECTS OF DEEP-SEATED OIL-GAS RESERVOIRS IN BOHAI BAY BASIN
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摘要: 渤海湾盆地深层发育潜山、火成岩和碎屑岩三大类储集体,控制了深层可形成潜山、火成岩和碎屑岩三大类油气藏。据不同类型油气藏成藏主控因素,进一步归纳出渤海湾盆地深层具有源下潜山风化壳溶孔-裂缝、源下潜山内幕裂缝、源内火成岩裂缝、源内超压砂岩孔隙-裂缝和源外砂砾岩裂缝5种亚类油气藏。潜山油气藏分布较广,火成岩油气藏分布较为局限,碎屑岩的源内超压砂岩孔隙-裂缝油气藏主要分布于盆地中、东部,源外砂砾岩裂缝油气藏发现较少。系统对比分析认为,潜山和欠压实碎屑岩油气藏是深层现实的勘探领域,火山岩油气藏是深层重要的勘探领域,具有较好的勘探前景。Abstract: Buried hills, igneous rocks and clastic rocks are the three main types of reservoirs and oil-gas pools in the deep part of the Bohai Bay Basin. According to the main control factors, five hydrocarbon accumulation models were obtained.They are the dissolved pore-crack reservoir in the weathering crust under the source rock, the inner crack reservoir in buried hills under the source rock, the igneous crack reservoir within the source rock, overpressured sandstone pore-crack reservoir with the source rock and sandstone/gravel crack reservoir beyond the source rock, respectively. The distribution of the buried hill reservoirs is extensive, and igneous rock reservoirs limited. Overpressure sandstone pore-crack reservoirs within the source rock mainly occur in the middle and east part of the Bohai Bay Basin. Sandstone/gravel cracks outside the source rock reservoirs are less in the Bohai Bay Basin.According to this study, the buried hill and under-compaction clastic rock reservoirs are the realistic exploration targets, but igneous reservoirs should not be neglected due to its high potential.
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