Control of contractional strike-slip transfer zone on large traps: a case study of Penglai 19-3 Oilfield
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摘要:
蓬莱19-3特大型整装油田是渤海油田郯庐断裂带油气成藏的典型代表之一。目前油田发现三级石油地质储量达10亿t，但对其大型圈闭的形成机制尚无针对性报道。为了弄清蓬莱19-3油田圈闭的成因机制，本研究基于三维地震、钻井、构造正演模拟、沙箱物理模拟等地质资料分析，认为增压型走滑转换带控制了蓬莱19-3油田大型圈闭的形成，继而进一步探讨了增压型走滑转换带对蓬莱19-3油田大型圈闭的控制机制。蓬莱19-3构造是由多级、多类型转换带共同控制的大型背形构造，具有“间歇式增压隆升”和“排烃期定型”两大特点；其形成的大型圈闭与盖层、烃源岩晚期排烃形成了良好的时空配置关系。转换带研究对今后在走滑断裂带内寻找大中型油气田具有一定的借鉴意义。
Abstract:The Penglai 19-3 ultra large integrated oilfield is one of the typical representatives of oil and gas accumulation of the Bohai oilfields in the Tan-Lu Fault Zone. At present, tertiary petroleum geological reserves of the oilfield have reached one billion tons, but there is no targeted report on the formation mechanism of its large-scale traps. To clarify the formation mechanism of traps in Penglai 19-3 Oilfield, geological data were analyzed based on 3D seismic, drilling, structural forward simulation, sandbox physics simulation, and so on. It was believed that the contractional strike slip transfer zone controlled the formation of large traps in Penglai 19-3 Oilfield, and the controlling effect was further explored. The Penglai 19-3 Structure is a large-scale antiform structure controlled by multiple levels and types of transfer zones, characterized by "intermittent contractional uplifting" and "structural finalization during hydrocarbon expulsion". The large traps formed have a good spatiotemporal configuration relationship with late hydrocarbon expulsion from cap rocks and source rocks. The study of the transition zone has certain reference significance for finding large and medium-sized oil and gas fields in the strike-slip fault zone in the future.
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表 1 蓬莱19-3油田及围区探井钻遇地层统计
Table 1. Statistics of strata encountered in exploration well drilling in Penglai 19-3 Oilfield and its surrounding areas
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