QUANTITATIVE EVALUATION OF FAULT SEALING MODE AND CAPACITY IN THE SUBEI BASIN
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摘要: 苏北盆地断层十分发育,油藏形成与断层通道和封堵多重控制作用密切相关,油藏以复杂断块圈闭为主。通过解剖油藏和落空断块的断层封闭性数据集特征,归纳出断层封闭有4类基本模式,即砂泥对接封闭型(A型)、砂泥混接封闭型(B型)、时间配置封闭型(C型)和主压力封闭型(D型)。在此基础上,对B型、C型和D型按其形成机制和主控因素细化分类,指出了影响断层封闭性的4项主要参数,据此建立相应的断层封闭性定量评价体系。新认识在油气勘探开发实践中得到广泛应用,取得了良好的效果和经济效益。Abstract: Faults are well developed in the Subei Basin.The formation of oil reservoir is closely related to multi-control actions of fault passage and fault sealing.Oil reservoirs are mainly complex fault block reservoirs.Based on the analysis of oil reservoir and characteristic of fault seal data set,4 types of essential sealing modes are developed in this paper,which include butt joint seal mode of sand and mud layer(type A),mixed seal mode of sandstone and mudstone of layers(type B),time match sealing mode(type C),and principal stress sealing mode(type D).Type B,C,and D are further classified by forming mechanism and controlling factors of sealing.According to the above,4 parameters controlling fault seal and quantitative evaluation system of fault seal are set up,which are widely used in petroleum exploration and exploitation with immediate effect and economic benefit.
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