东营凹陷大芦湖油田樊29块沙三中亚段剩余油分布研究

发布时间：2018-06-10 06:35

本文选题：低渗透 + 湖底扇　；参考：《中国石油大学(华东)》2015年硕士论文

【摘要】：大芦湖油田樊29块为一深层构造-岩性低渗透油藏,沙三中亚段4砂组是本区主要的含油层位,也是本次研究的目的层段。研究区地质研究程度低,单砂体的沉积期次和沉积微相展布认识不清,沉积相模式尚有待落实,对储层非均质的研究少,上述问题导致研究区部分井注水开发效果差,研究区剩余油分布复杂。本文针对这些问题,综合利用地震、测井及生产动态等资料,对目的层段沙三中亚段4砂组进行了精细地层划分和对比,建立了4砂组小层等时划分与对比格架;并在划分出的4个小层内识别出10期单砂体。沉积微相研究认为研究区沙三中亚段4砂组沉积时期主要发育湖底扇中扇及外扇亚相,并对中扇亚相进一步划分了辫状水道、水道间、朵叶体及席状砂微相,其中辫状水道和朵叶体微相较为发育,进一步阐明了各种沉积微相展布规律,并建立了研究区湖底扇沉积相模式。对研究区储层特征进行了简要论述,研究区属于中孔低渗储层,储层的平面展布和物性分布均受控于沉积相带的展布。通过定量求取储层非均质参数与隔夹层研究,以小层为单位,开展了储层层内、层间、平面非均质研究,认为研究区4砂组43和45小层非均质性较弱,42和44小层非均质性较强。基于单砂体,建立了储层精细地质模型,包括构造格架模型,精细单砂体模型,单砂体模型约束下的沉积微相模型以及油藏属性模型。并对模型进行了地质模型与概念模型对比验证和概率分布一致性检验,结果表明所建立的地质模型较可靠。结合数值模拟结果,对研究区剩余油分布和控制因素进行了研究。研究认为沉积微相、储层非均质性、微构造和断层、储层孔隙结构和流体性质等地质因素以及注采井网和射孔位置等开发因素共同影响着研究区剩余油的分布;总体上4砂组42和43小层剩余油富集,44小层和45小层分布相对集中。针对研究区存在的问题,提出了一些调整对策,包括井网优化和完善注采井网,划分开发层系,以及补孔复射等措施,从而提高油田的开发效果。
[Abstract]:Fan 29 block in Daluhu Oilfield is a deep tectonic-lithologic low permeability reservoir. The 4 sand formation in the middle part of the third member of Sha is the main oil-bearing formation in this area, and is also the target layer of this study. In the study area, the degree of geological research is low, the sedimentary stage and distribution of sedimentary microfacies of single sand body are not clear, the sedimentary facies model is still to be implemented, and the research on reservoir heterogeneity is few. These problems lead to poor water injection development effect in some wells in the study area. The distribution of remaining oil in the study area is complex. Aiming at these problems, this paper makes comprehensive use of seismic, well logging and production performance data, carries on fine stratigraphic division and correlation to 4 sand formation in the middle part of Sha 3 in the target formation, and sets up the isochronous division and correlation framework of 4 sand formation. The single sand bodies of 10 phases were identified in the 4 sublayers. The sedimentary microfacies study shows that the subfacies of sublacustrine fan and outer fan are mainly developed in the sedimentary period of the 4th sand formation in the middle part of the study area, and the subfacies of the middle fan are further divided into braided channel, watercourse, flower leaf body and sheet sand microfacies. The microfacies of braided waterway and flower leaf body are relatively developed. The distribution law of various sedimentary microfacies is further clarified and the sedimentary facies model of sublacustrine fan in the study area is established. The reservoir characteristics of the study area are briefly discussed. The study area belongs to the middle porosity and low permeability reservoir, and the distribution of the plane distribution and physical properties of the reservoir is controlled by the distribution of the sedimentary facies belt. Based on the quantitative study of reservoir heterogeneity parameters and intercalation, and taking the small layers as the unit, the heterogeneity of reservoir layer, interlayer and plane is studied. It is considered that the heterogeneity of 4 sand groups 43 and 45 in the study area is stronger than that of the weak layers 42 and 44. Based on single sand body, the fine geological model of reservoir is established, including structural framework model, fine single sand body model, sedimentary microfacies model constrained by single sand body model and reservoir attribute model. The geological model is compared with the conceptual model and the consistency of probability distribution is verified. The results show that the geological model is reliable. Combined with the numerical simulation results, the remaining oil distribution and control factors in the study area were studied. It is considered that sedimentary microfacies, reservoir heterogeneity, microstructures and faults, pore structure and fluid properties of reservoir, and development factors such as injection-production pattern and perforation location affect the distribution of remaining oil in the study area. On the whole, the remaining oil of 4 sand formation 42 and 43 are concentrated relatively. In view of the problems existing in the study area, some adjustment countermeasures are put forward, including optimizing and perfecting the injection-production well pattern, dividing the development layer, and filling the hole and reshooting, so as to improve the development effect of the oil field.
【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】：TE327

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