尼日尔三角洲E背斜顶部断裂演化机制及封闭性

发布时间：2018-07-06 12:31

本文选题：断裂演化 + 断层封闭性　；参考：《石油与天然气地质》2017年05期

【摘要】：尼日尔三角洲深水区E油田背斜顶部发育大量密集断层,多数断层倾向一致呈多米诺式排布,活动机制和期次不清楚,对油水的分隔作用不明确。基于构造解析思想,通过构造平衡剖面和古构造图回剥技术研究E背斜的轴面迁移过程,结合断裂成核理论明确断裂活动期次和机制,进而划分断裂系统,指导断裂的封闭性评价。提出深水背斜顶部正断层重力滑动的演化机制,确定多米诺式正断层与背斜轴面迁移的多期次对应关系。E构造共分为4个演化阶段,发育7类断裂系统,其中三个期次的重力滑动断阶(阶梯式)断层为本区独有的特殊构造,在古背斜背景下受控于重力作用变形。逆冲断层和多期活动断层的封闭趋势强,重力滑动断阶断层具有潜在封闭性,而晚期伸展断层不具有封闭能力,筛选出16条潜在封闭断层。确定本区断层弱封闭SGR临界值为8%,完全封闭临界值为20%,评价结果显示:其中8条断层完全封闭,能够将断层两盘分隔为不同油水单元,4条断层具有弱封闭能力,不分隔油水,仅影响注水受效,从而指导油田的钻井和注采方案设计。
[Abstract]:There are a large number of dense faults in the top of E oilfield anticline in the deep water area of Niger Delta. Most faults tend to be domino arrangement. The mechanism and stage of activity are not clear and the separation of oil and water is not clear. Based on the idea of structural analysis, the axial migration process of E anticline is studied by structural equilibrium section and paleotectonic map backstripping technique. Combined with the theory of fault nucleation, the time and mechanism of fault activity are determined, and the fault system is further divided. To guide the sealing evaluation of faults. The evolution mechanism of gravity slip of normal fault at the top of deep water anticline is put forward. It is determined that the corresponding relationship between domino normal fault and backslope plane migration is divided into four stages, and 7 types of fault systems are developed. The gravimetric slip fault (step type) fault in three periods is a special structure in this area, which is controlled by gravity deformation in the paleo-anticline background. The thrust fault and multi-stage active fault have strong sealing tendency, the gravimetric slip fault has potential sealing property, but the late extensional fault has no sealing ability, 16 potential sealing faults have been screened out. It is determined that the critical value of SGR for weak sealing of faults in this area is 8 and the critical value for complete sealing is 20. The evaluation results show that 8 faults are completely closed and 4 faults can be separated into different oil-water units with weak sealing ability and no separation of oil and water. Only the effect of water injection is affected to guide the design of drilling and injection-production schemes in oil fields.
【作者单位】：东北石油大学CNPC断裂控藏研究室;黑龙江省科技创新团队"断裂变形封闭性及流体运移";东北石油大学非常规油气成藏与开发省部共建国家重点实验室培育基地;中国石油华北油田公司勘探开发研究院;中海油研究总院;
【基金】：国家自然科学基金项目(41572127,41502136) 中国石油天然气股份有限公司重大科技项目(2016D-0702)
【分类号】：P618.13

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