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塔里木盆地塔中Ⅲ区断裂发育,从塔里木盆地区域应力场入手,利用三维地震资料,在断裂精细刻画的基础上,探讨了塔中Ⅲ区断裂系统对奥陶系碳酸盐岩储层的控制作用。塔中Ⅲ区主要发育4期断裂,分别是寒武纪—早奥陶世拉张断裂、中晚奥陶世挤压走滑断裂、志留纪—泥盆纪北东左旋扭张走滑断裂和二叠纪岩浆刺穿导致的断裂,断裂性质有逆冲、挤压走滑以及扭张走滑3类。勘探证实塔中Ⅲ区奥陶系主要发育颗粒滩相储层与缝洞型储层。利用均方根振幅属性结合断裂体系的精细解释,从平面上刻画了桑塔木组低部颗粒灰岩的平面展布,进而得到了下伏良里塔格组沉积相带的平面展布。利用振幅属性和AFE技术分别得到了奥陶系储层与断层破碎带的平面分布。断裂系统、沉积相、断层破碎带与储层的平面展布关系表明储层的发育与断裂密切相关:中晚奥陶世挤压走滑断裂控制了上奥陶统颗粒滩相带分布,挤压走滑断裂附近是有利的颗粒滩相储层发育区。多期走滑断裂控制断裂破碎带及岩溶带的发育,对碳酸盐岩储层的改造作用最为显著。走滑断裂及其伴生的破碎带附近裂缝比较发育,增加了储层的连通性和渗透性,并成为热液流体的优势运移通道,明显改善了缝洞型储层的储集能力。
Based on the regional stress field in the Tarim Basin, based on the detailed seismic fault description, the fault control of the Ordovician carbonate reservoir in the Tazhong III area is discussed effect. There are four main faults in Tazhong Ⅲ area, which are the Cambrian-Early Ordovician tensile faults, the Middle-Late Ordovician strike-slip faults, the Silurian-Devonian s The faults caused by the magmatic piercing in the Cretaceous, thrusting, crushing and slipping are three types of faults. Exploration confirmed that the Ordovician in the Tazhong III area is mainly composed of grain-beach facies reservoirs and fracture-cave reservoirs. Using the root mean square amplitude property combined with the fine interpretation of the fault system, the plane distribution of grain limestone in the lower part of the Sonamu Group is depicted from the plane, and the plane distribution of the sedimentary facies belts in the Lower Lianglitage Formation is obtained. The plane distribution of Ordovician reservoir and fault fracture zone is obtained by using amplitude attribute and AFE technique respectively. The relationship between the fracture system, sedimentary facies, fault rupture zone and reservoir plane distribution shows that the reservoir development is closely related to the fault fracture. The middle-late Ordovician strike-slip faults control the distribution of Upper Ordovician granulite facies belt The vicinity of the strike-slip strike-slip fault is favorable for the development of the granulite-facies reservoir. Multi-stage strike-slip faulting controls the development of fractured zones and karst zones, and plays a significant role in the reformation of carbonate reservoirs. The relatively developed fractures near strike-slip faults and associated crushed zones increase reservoir connectivity and permeability and become the predominant migration channels for hydrothermal fluids and significantly improve the reservoir capacity of fractured-cave reservoirs.