OIL AND GAS MIGRATION MODEL "DOUBLE FAULTS-RELAY" AND ITS EXPLORATION PRACTICE ON THE EASTERN SLOPE OF SHIJIUTUO UPLIFT, BOHAI SEA
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摘要:
为厘清斜坡带油气运移、聚集、成藏等科学难题，高效指导斜坡带油气勘探，通过综合分析石臼坨凸起东部斜坡区的石油地质特征，提出了“双断-接力”油气运移模式。边界断裂活动性、断面形态及启闭性控制油气由凹陷向凸起垂向运移，并在凸起斜坡区沿新近系馆陶组横向运移，馆陶组顶面形态控制油气横向运移方向；切脊次级断裂控制油气最终聚集成藏。基于QHD33-1S油田区的264个已钻砂体统计，控制砂体成藏的切脊次级断裂(A类断裂)，均位于油气优势运移路径上，且断层活动性>50 m、切入馆陶组构造脊的规模在4 km以上。勘探实践证实，位于油气优势运移路径上、A类断裂控制下的构造和构造-岩性圈闭是油气成藏的有利区。
Abstract:In order to reveal the regulations for oil and gas migration and accumulation in the eastern slope zone of Shijiutuo Uplift, Bohai Sea, so as to efficiently guide oil and gas exploration there, based on the comprehensive study of petroleum geological characteristics of the area, this paper puts forward a "double-fault-relay" model for hydrocarbon migration. It is proposed in the model that the vertical migration of hydrocarbon is mainly controlled by boundary faults, the shape of cross-section and the opening-closing rhythm of the faults, the lateral migration of hydrocarbon controlled by the distribution pattern of the Guantao Formation, while the accumulation of hydrocarbon in the final stage controlled by the secondary faults. Based on the statistics of 264 drilled sand bodies in the QHD33-1S Oilfield, the secondary faults (type A faults), which control hydrocarbon accumulation in sand bodies, all occurred along the dominant migration path, where the fault activity is over 50 m, and the distance cutting into the structural ridge of Guantao Formation is larger than 4 km. Exploration practice has proved that structural and structural-lithologic traps existed along the main migration path of oil and gas and controlled by type A faults are favorable areas for hydrocarbon accumulation.
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