新北油田右旋走滑应力场内断层封堵性及其对成藏的控制作用  

Analysis of Fault Sealing in the Right Hand Strike-Slip Stress Field of the Xinbei Oilfield and Its Controlling Effect on the Reservoir

作　　者：王志伟[1,2] Wang Zhiwe(Offshore Oil Production Plant,Shengli Oilfield Company,SINOPEC,Dongying Shandong 257237,China;China University of Petroleum,Qingdao Shandong 266580,China)

机构地区：[1]中石化胜利油田分公司海洋采油厂 [2]中国石油大学

出　　处：《地质科技情报》2019年第4期145-152,共8页Geological Science and Technology Information

基　　金：十三五国家重大科技专项“渤海湾盆地精细勘探关键技术(三期)”(2016ZX05006)

摘　　要：新北油田是胜利油田滩海石油勘探的重点区域,郯庐走滑断裂带位于其东部,右旋走滑为研究区应力场的主控因素,研究区内形成张扭应力场,产生NNE-SSW向的同向走滑和NEE-SWW向的拉张。新北油田主要为断块、断鼻构造型油藏,含油高度在20 m以上的多个圈闭钻探失利,表明该区断层封堵性的复杂性。创造性地提出了断层封堵性的"三级评价"模式:通过定性的描述--区域应力场分析、断距分析、"砂-泥"并置关系研究、断层与岩层产状配置关系研究;定量的计算--SGR参数、断层泥厚度以及油柱高度与圈闭闭合幅度的匹配程度等单因素进行分析;多因素综合评价。研究结果表明,新北油田近南北向断层开启性较强,近东西向断层封闭性较强且断距大,SGR≤0.26且断层泥厚度小于0.2 m的断层封堵性最差,断层面泥质含量高的断层其圈闭的含油高度也相对较高,在断层封堵性分析基础上获得的馆下段Ⅱ砂组、馆下段Ⅲ砂组、馆下段V砂组和东营组Ⅲ砂组4个砂组的圈闭评价成果,可以有效地指导下一步的勘探研究工作。Xinbei Oilfield is an important area for oil exploration in the beaches of Shengli Oilfield.The strike-slip fault zone is located in its east.The right strike-slip fault is the main control factor of the stress field in the research area.A torsional stress field is formed in the research area,resulting in NNE-SSW,stretching the same direction slip and NEE-SWW direction.Xinbei Oilfield is mainly a fault block and a broken nose shape reservoir,but the failure of a number of closed drilling with an oil content height of more than 20 meters reveals the complexity of fault plugging in the area.The paper proposes the"three-level evaluation"model of fault closure.A multi-factor comprehensive evaluation is conducted after qualitative regional stress field analysis,break distance analysis,"sand-mud"parallel relationship study,fault and rock formation configuration relationship and quantitative SGR,fault mud thickness evaluation and oil column height and closure degree matching.The study concludes that the fault closure in Xinbei Oilfield is relatively strong,the near-east-west fault is relatively closed with a large break distance,and the SGR is less than 0.26 and the fault mud thickness is less than 0.2 meters.The oil content in the closure of faults with high muddy content in the fault layer is also relatively high.The results of the traps evaluation of the four sand groups NgxII,NgxIII,NgxV and EdIII formed on the basis of the fault closure analysis.

关 键 词：新北油田 走滑断裂 断层封堵性 断层面泥质含量 SGR 

分 类 号：P542.3[天文地球—构造地质学]