摘要
A区块位于阿尔及利亚撒哈拉地台东北部,石油地质条件优越。由于受到多期构造作用叠加,形成了复杂的断裂系统。研究区共发育4个不同级次的断裂体系并可划为下部断陷、中部坳陷、上部逆冲反转3套构造层。断层在平面上发育平行状、辫状、梳状、雁列状和帚状5种断裂样式,在剖面上发育平行、"X"型、"V"型、"Y"型和堑垒型5类断裂组合。断裂体系的形成演化响应于区域上的伸展-抬升-拉张-挤压4期构造活动。区块内发育受断层控制的低幅度断背斜、断块构造和逆冲挤压反转构造3种类型构造圈闭。受早白垩世奥地利运动影响,断裂在研究区西部与中部对油气聚集成藏起输导作用,在东部对油气成藏起破坏逸散作用。
Block A was located in the northeast of Sahara platform in Algeria with superior petroleum geological conditions.Complex fault systems were formed as a result of the superposition of multistage tectonic movements.There developed 4 different levels of fault systems in the study area,which could be divided into 3 sets of structural layers,including the lower fault subsidence,the central depression layer and the upper thrusting inversion layer.Five fault patterns such as parallel type,braided type,comb-like type,echelon type and broom-like type were identified on the plane,and 5 fault combinations such as parallel type,"X"Type,"V"Type,"V"Type and graben-horst Type were developed on the profile.The evolution of the fault systems was probably affected by 4 stages of tectonics:extensional stage,uplifting stage,stretching stage and compressional period.The formation of three types of structural traps including low-amplitude anticlinal traps,fault-block traps and thrusting compressional traps were controlled by faults.Due to the influence of the Early Cretaceous Austrian orogeny,the faults in the west and center are favorable for hydrocarbon accumulation,whereas in the east the faults are destructive to the hydrocarbon accumulation.
出处
《长江大学学报（自然科学版）》
CAS
2018年第11期1-8,共8页
Journal of Yangtze University(Natural Science Edition)
基金
国家科技重大专项(2011ZX05030-003)
关键词
石油地质
断裂特征
断层演化
油气成藏
阿尔及利亚
petroleum geology
fault characteristics
fault evolution
hydrocarbon accumulation
Algeria
