现河庄地区河146断块沙三中亚段储层地质研究

发布时间：2019-01-06 08:17

【摘要】：现河庄地区河146断块沙三中亚段沉积的浊积扇储层为中孔低渗透储层,具有储层非均质性强,剩余油分布规律复杂的特征。由于地质情况认识不清楚,随着油田开发的进行,开发矛盾开始凸显,制约着油田后期的开发调整,因此需要开展储层地质研究,为后期开发调整提供指导和参考依据。本文首先在区域沉积背景的基础上,以层序地层学为指导,建立研究区的地层格架。然后,根据岩心、测井、地震以及开发动态资料,全面考虑构造、沉积特征以及油水关系等多种因素,在标志层的控制下,采用“旋回对比、分级控制”的方法,进行精细的地层对比,将沙三中亚段所钻遇的地层划分为5个砂层组,64个小层,建立了等时地层格架。根据以上的工作,进行主力小层的沉积微相及其平面展布以及纵向上的沉积演化研究,总结出沉积模式。最后在沉积相研究的基础上,研究工区内浊积扇砂体的储层构型特征及其开发响应,其中着重研究浊积水道砂体的构型及开发响应特征,最后选取两个具有代表性的解剖区进行对比,探讨构型对剩余油的影响。研究表明研究层段可以划分出湖泊低水位体系域、湖泊水侵体系域和高水位体系域,沉积相主要为供给水道型浊积扇和无根型滑塌浊积扇,其中4砂层组主要发育浊积水道,1-3砂层组发育无根型滑塌浊积扇,其具有数量多、个体小,纵向上多期叠加的特征,浊积砂体的分布主要受古地形、断层、湖平面以及沉积物供应共同控制。单纯通过测井曲线得出的两套看似连通的砂体,在生产开发的过程中往往发现其实际上并非连通,因此本文将地质和开发数据结合,研究储层的构型特征,根据研究区内浊积砂体的连通关系及开发响应,将浊积水道砂体的连通关系总结为浊积水道主体连通型(下切叠加型)、分支浊积水道砂体不连通型以及浊积水道主体-边缘连通型(弱下切叠加-接触型)三类。单一水道构型特征与井网的匹配关系是剩余油的主要影响因素,后期完善注采井网时,油、水井延单一水道延伸方向调整布置,同时还需考虑砂体的连通关系,这样利于提高采收率。
[Abstract]:The turbidite fan reservoir in the middle part of the third member of He146 fault block in Xianhezhuang area is a middle porosity and low permeability reservoir with strong heterogeneity and complicated remaining oil distribution law. Because the geological condition is not clear, with the development of the oilfield, the contradiction of development begins to become prominent, which restricts the adjustment of the later development of the oilfield, so it is necessary to carry out reservoir geological research to provide guidance and reference for the adjustment of the later development. In this paper, based on the regional sedimentary background, the stratigraphic framework of the study area is established under the guidance of sequence stratigraphy. Then, according to the core, logging, seismic and development dynamic data, and taking into account various factors, such as structure, sedimentary characteristics and oil-water relationship, under the control of marker layer, the method of "cycle contrast, grading control" is adopted. According to the fine stratigraphic correlation, the strata in the middle part of Sha 3 are divided into 5 sand formations and 64 sub-layers, and the isochronous stratigraphic framework is established. According to the above work, the sedimentary microfacies and their plane distribution of the main layer and the sedimentary evolution in the longitudinal direction are studied, and the sedimentary model is summarized. Finally, based on the study of sedimentary facies, the reservoir configuration and development response of turbidite fan sand body in the working area are studied, especially the configuration and development response of turbidite sand body. Finally, two representative anatomical regions were selected for comparison to investigate the effect of configuration on residual oil. The study shows that the study layer can be divided into lake low water level system tract, lake water invasion system tract and high water level system tract. The sedimentary facies are mainly supply channel turbidite fan and rootless sloughing turbidite fan. There is no root sloughing turbidite fan in 1-3 sand formation, which has the characteristics of large number, small individual and superposition in longitudinal direction. The distribution of turbidite sand body is mainly controlled by paleotopography, fault, lake level and sediment supply. Two sets of seemingly connected sand bodies obtained from log curves are often found to be not connected in the process of production and development. Therefore, the geological and development data are combined in this paper to study the structural characteristics of reservoirs. According to the connection relation and development response of turbidite sand body in the study area, the connection relation of turbidite channel sand body is summarized as the main connected type of turbidite channel (incised superposition type). There are three types of sand body disconnection in branched turbidite channel and three types: main body and edge connected type (weak undercut superposition-contact type). The matching relationship between the configuration characteristics of single waterway and well pattern is the main influencing factor of remaining oil. When the injection-production pattern is improved, the extension direction of oil and wells along a single waterway should be adjusted and the connection of sand body should be considered. This is conducive to increasing oil recovery.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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