塔河二区奥陶系缝洞储集体特征描述

发布时间：2018-02-22 14:17

本文关键词： 塔河二区奥陶系岩溶作用缝洞型储层　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：论文以塔河二区奥陶系碳酸盐岩岩溶储层为研究对象,在大量调研前人研究的基础上,运用储层地质学、碳酸盐岩沉积学、测井地质学以及开发地质学基本原理及知识,采用岩心观察描述、测井储层识别、地震属性预测等手段,总结了塔河二区奥陶系缝洞储集空间类型及储层成因类型,对储层发育规律及储层主控因素进行了讨论,并进行了有利储集区带评价。塔河二区奥陶系油藏主要发育四种储层:裂缝-孔隙型储层、裂缝-孔洞型储层、溶洞型及裂缝型储层,结合生产动态资料,表明贡献最大的、最重要的是岩溶洞穴型储层的;贡献次之的是裂缝-孔洞型储层;溶蚀孔隙型储层和裂隙型储层贡献很有限。岩溶储层的发育受加里东期、海西期构造活动控制剥蚀界面及岩溶范围,岩溶储层的发育分布与海西早期不整合面有着密切的关系,在海西的早期不整合面之下0～40m深度范围,岩溶储层出现频率达91.7%,在之下出现频率则显著减小;表明塔河油田二区北部及尖灭线附近区域,不整合面0～40m的深度范围内是岩溶储层(岩溶洞穴型储层与岩溶缝孔洞型储层叠加到一起)普遍发育的层段,在一定意义上可认为岩溶储层是具有受不整合面控制呈层分布(或呈块状展布)的特征。同生期岩溶作用控制;海西早期岩溶作用在塔河二区奥陶系油藏奥陶系恰尔巴克组以南以北均普遍发育,同生期大气水溶蚀作用在南部覆盖区的滩相裂缝-孔隙型储层中普遍发育;研究区储层发育、分布的主要控制因素是断裂分布特征、古地貌形态、古水系分布规律;塔河二区奥陶系储层地震响应特征主要为"表层弱+内幕串珠状"与"表层强(弱)+内幕杂乱反射"。最终在上述研究的基础上,根据以上认识,认为二区潜力区带主要在:TK252-TK233X近南北向条带;TK209-TK212近北西-南东向构造斜坡;S79-T208近北东-南西向构造斜坡;TK242-TK254东部井区钻井密度低,局部具有表层弱+内幕强振幅的特征,可进一步开展潜力评价工作。
[Abstract]:This paper takes Ordovician carbonate karst reservoir in Tahe area as the research object. Based on a large number of previous studies, the basic principles and knowledge of reservoir geology, carbonate sedimentology, logging geology and development geology are used. By means of core observation description, logging reservoir identification and seismic attribute prediction, this paper summarizes the reservoir space types and reservoir genetic types of Ordovician fractures and cavities in Tahe area, and discusses the rules of reservoir development and reservoir control factors. Four types of reservoirs are mainly developed in Ordovician reservoirs in Tahe second area: fracture-pore reservoirs, fracture-pore reservoirs, cavernous reservoirs and fractured reservoirs. The most important one is karst cavernous reservoir, the second contribution is fracture-pore reservoir, the contribution of dissolution pore reservoir and fissure reservoir is very limited. The development of karst reservoir is affected by Caledonian period, The tectonic activity of the Hercynian period controls the denudation interface and the karst area, and the development and distribution of karst reservoirs are closely related to the early Hercynian unconformities, which are within a depth of 40 m below the early Hercynian unconformity surface. The occurrence frequency of karst reservoir is up to 91.7, but the occurrence frequency of the lower reservoir decreases significantly, which indicates that the northern part of Tahe Oilfield and the area near the Tiendiao line, Within the depth of 0 ~ 40m of unconformity surface, karst reservoirs (karst cavernous reservoirs and karst fracture-porosity reservoirs superimposed together) are generally developed. In a certain sense, it can be considered that the karst reservoir is characterized by stratigraphic distribution (or block distribution) controlled by unconformities, and controlled by syngenic karstification. The early Hercynian karstification developed generally to the south of Ordovician Charbach formation in Ordovician reservoir of Tahe II area, and the syngenetic atmospheric water dissolution developed generally in the shoal fissure pore type reservoir in the southern overburden area, and the reservoir developed in the study area. The main controlling factors of distribution are fault distribution, paleogeomorphology and paleogeomorphology. The seismic response characteristics of Ordovician reservoirs in Tahe second area are mainly characterized by "weak inner layer beading" and "surface strong (weak) internal clutter reflection". Finally, on the basis of the above research, and based on the above understanding, It is considered that the potential zone is mainly located in the TK209-TK212 near NW-SE structural slope TK209-T212, which is mainly located in the TK252-TK233X NW trending structural slope. S79-T208 near NE-SW structural slope TK242-TK254 is characterized by low drilling density and strong amplitude in the surface layer. Potential evaluation can be carried out further.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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