临南地区扭张构造形成机制及其控藏作用  

Formation and evolution of transtensional structure and its hydrocarbon accumulation control in Linnan area

作　　者：王东晔 WANG Dongye(Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China)

机构地区：[1]中国石化胜利油田分公司勘探开发研究院,山东东营257015

出　　处：《油气地质与采收率》2021年第2期60-67,共8页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项“渤海湾盆地精细勘探关键技术”(2016ZX05006)。

摘　　要：针对以往对临南地区扭张构造的发育演化机制、扭张构造对油气成藏要素的控制作用认识不清等问题,综合运用地质、地球物理、数值模拟等方法,定性分析和定量评价相结合,对研究区扭张构造形成机制及其控藏作用进行研究。结果表明,临南地区始于伸展性动力学背景下的斜向拉伸运动,由于复活的基底断层走向斜交于区域拉伸方向,从而形成了典型的扭张构造体系。综合考虑水平伸展、垂向块断运动和侧向走滑运动,建立了扭张构造定量表征方法,扭张活动强度平均约为0.4。扭张构造对储层发育具有明显的控制作用,稳定沉降缓坡、同沉积断坡和持续迁移下陷缓坡3种斜坡控砂模式控制形成不同类型的圈闭。基于三元型、二元型、一元型和无结构型4种断裂带结构模式,建立了扭张断裂带动态平衡成藏、斜坡带侧向运聚成藏、洼陷带自生自储成藏模式。The formation mechanism and hydrocarbon accumulation control of the transtensional structure in the study area are studied comprehensively with geologic and geophysical and numerical simulation methods with qualitative analysis and quantitative evaluation to improve the understanding of the development and evolution mechanism of the transtensional structure and its effect on the controlling factors of hydrocarbon accumulation in Linnan area.Results demonstrate that the Linnan area first stretches obliquely due to extensional force,and then a typical transtensional structure is formed because the reactivated basement fault strike is oblique to the extension direction of the area.Considering horizontal extension,verti⁃cal block faulting and lateral strike-slip movement,a quantitative characterization method of the transtensional structure are established.The average intensity of transtensional activity is about 0.4.The reservoir development is obviously con⁃trolled by the extensional structure.Three sand control modes of gentle slopes with stable subsidence,continuous migration and subsidence and slopes with synsedimentary faults affect the formation of different traps.The accumulation modes of dy⁃namic equilibrium in the transtensional fault zone,lateral migration in the slope zone and self-generation and self-storage in the sag zone are established according to the four structures of fault zones,namely ternary,binary,unitary and unstruc⁃tured modes.

关 键 词：扭张构造 斜向拉伸 断裂带结构 分布序列 成藏模式 临南地区 

分 类 号：TE121.2[石油与天然气工程—油气勘探]