临南洼陷田5断块油藏地质特征研究

发布时间：2019-02-14 15:53

【摘要】：本文针对田5断块特定的油藏地质特点和开发现状,运用一些新的技术手段,在前人对该区研究认识的基础上,对目的层段进行单砂层级别的精细地层划分对比,并利用三维地震资料结合地层划分对比的结果重新进行构造解释,在弄清构造特征的基础上,利用邻区的实验数据结合测井资料重新对储层进行测井解释,并依据解释结果对储层的宏观非均质性进行研究、对储层进行分类评价。在以上研究内容的基础上,建立储层三维地质模型,为后期的油藏数值模拟工作奠定基础。田5块沙二上划分为三个砂层组共40个小层,其中含油小层19个,其中三砂组3小层,四砂组1小层、3小层、7小层是主力含油小层,砂体厚度较大,平面分布稳定。通过精细构造解释研究认为,该区由南北两条边界断层切割而成,内部又被一条近南北向断层切割为东西两个小断块,与前人研究结果相比,南北边界断层在平面上的形态有所变化,包括断块内所发育次级断层在内,共识别断层4条,在垂向上三个砂层组的继承性较好,构造均为简单的单斜构造。通过测井二次解释的认识成果,该区储层为中孔中渗储层,孔隙度的分布范围大都在20%以上,渗透率的分布范围在70×10-3μm2~100×10-3μm2之间。对储层宏观非均质性研究认为,储层的层间层内及平面非均质行较强,据此对储层进行分类评价,将该区储层分为三大类,其中四砂组的一类储层明显多于二、三砂组。对该区进行储量计算并建立储层三维地质模型,通过数据分布特征及模型储量计算结果,对模型进行检验。田5断块油源主来来自于南部临南洼陷,在北界断层的封堵作用下聚集成藏,油的分布受构造特征的影响,主要分布在北界断层的构造高点附近,由于内部次级断层的封闭作用,使得东西两个断块分属于不同的油水系统,具有不用的油水界面。此外,油分布还受储层非均质性的影响,在垂向上,由于层间隔层及层内夹层的发育,使各小层的油几乎不存在相关性;在平面上,一般孔隙度渗透率较大的区域,是油分布的主要区域。
[Abstract]:In this paper, according to the specific reservoir geological characteristics and development status of Tian5 fault block, using some new technical means, on the basis of the previous people's understanding of this area, the fine stratigraphic classification and correlation of single sand layer level are carried out for the target formation. Using 3D seismic data combined with the result of stratigraphic division and correlation to reinterpret the structure, on the basis of making clear the structural characteristics, using the experimental data of the adjacent area combined with the logging data to reinterpret the reservoir logging. According to the interpretation results, the macroscopic heterogeneity of the reservoir is studied, and the reservoir is classified and evaluated. On the basis of the above research, the reservoir 3D geological model is established, which lays the foundation for the later reservoir numerical simulation. The upper part of Sha 2 of Tian5 block is divided into three sand formations, including 19 oil bearing layers, among which 3 are three sand formation, 1, 3 and 7 are the main oil bearing layers, and the thickness of sand body is large and the plane distribution is stable, the third sand formation is 3 layers, the fourth sand group is 1 small layer, 3 small layers, 7 layers are the main oil bearing substrata, the sand body thickness is large and the plane distribution is stable. Through fine structure interpretation, it is considered that the area is cut by two boundary faults in the north and south, and the interior is cut into two small fault blocks from east to west by a near south to north fault, which is compared with the results of previous studies. The morphology of the north and south boundary faults has changed in the plane, including the secondary faults developed in the fault blocks, and four faults have been identified. The inheritance of the three sand formations in the vertical direction is good, and the structures are all simple monoclinic structures. Through the recognition of the secondary interpretation of logging, the reservoir in this area is mesoporous and permeable, the porosity distribution range is more than 20%, and the permeability distribution range is between 70 脳 10-3 渭 m ~ (-2) and 100 脳 10 ~ (-3) 渭 m ~ (2). Based on the study of the macroscopic heterogeneity of reservoir, it is considered that the interlayer and plane heterogeneity of the reservoir is stronger. According to the classification and evaluation of the reservoir, the reservoir in this area can be divided into three categories, among which the reservoir of four sand groups is obviously more than that of the second and third sand groups. The reserves are calculated and the reservoir 3D geological model is established. The model is verified by the distribution characteristics of the data and the result of the model reserve calculation. The oil source of Tian5 fault block mainly comes from the south of the south depression and accumulates into a reservoir under the action of sealing the north boundary fault. The distribution of oil is affected by the structural characteristics, mainly near the structural high point of the north boundary fault. Due to the sealing effect of internal secondary faults, the two fault blocks belong to different oil-water systems and have no oil-water interface. In addition, oil distribution is also affected by reservoir heterogeneity. In vertical direction, because of the development of interval layer and intercalation, there is almost no correlation between oil in each layer. On the plane, the area with high porosity and permeability is the main area of oil distribution.
【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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