Characteristics of S-type strike-slip transform zone and its control on lateral sealing of shallow oil and gas in Bozhong 8-4 Oilfield
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摘要:
新构造运动在渤海海域表现强烈，形成了渤中凹陷特有的走滑构造体系和浅层油气藏。前人研究集中在走滑运动论证和走滑转换带类型探讨上，缺乏对走滑构造带控藏作用的精细研究。利用地震资料，结合油田实例，探讨了渤中8-4油田走滑转换带特征和对油气侧封的控制作用。研究认为，渤中8-4油田主断裂为“S”型走滑转换带，发育释压带和增压带两类转换带。释压带地层陡，圈闭不发育，是油气由深向浅的充注段；增压带地层缓，背形特征清晰，低幅断鼻、断块圈闭集中发育，为油气汇聚区。建立了走滑断裂封闭指数以定量表征走滑转换带的侧封能力，通过近20个油田的统计分析，认为可以把走滑断裂封闭指数4作为走滑断层侧封的临界值。该成果为富砂背景下的浅层油气勘探工作提供了一种新的方法和思路。
Abstract:The neotectonic movement in Bohai Sea of is very intensive, forming a unique strike-slip structural system and shallow reservoir formation in the Bozhong Sag. Previous studies focused mostly on the demonstration of strike-slip movement and the discussion on the types of strike-slip transform zone, and there is a lack of detailed research on the role of reservoir controlling by the strike-slip transform zone. We studied the characteristics of S-type strike-slip transform zone in Bozhong 8-4 Oilfield and its control on the lateral sealing of oil and gas using seismic data and oilfield cases. Results show that the main fault in the Bozhong 8-4 Oilfield is an S-type strike-slip transform system, in which pressure-releasing belt and pressure-boosting belt are developed. In the pressure releasing belt, the strata are steep and traps are poorly developed, which is the filling zone of oil and gas from deep to shallow. The pressure-boosting belt is characterized by gently-dipping strata, clear anticline shape, and dense low-amplitude nose-like faults and faulted-block traps, forming oil and gas accumulation rooms. Meanwhile, we proposed the strike-slip fault sealing index with which the lateral sealing ability of the strike-slip transform belt could be quantitatively characterized. According to the statistics of nearly 20 oilfields, the value of the strike-slip fault sealing index at 4 can be regarded as the critical point of the lateral sealing of the strike-slip fault. The research results provide a new method and idea for exploration in shallow oil and gas under sand-rich background.
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