基于储层构型的低渗透油藏地质建模

发布时间：2018-07-13 07:50

【摘要】：镇北油田镇218区块长8_1亚段储层具有典型的低渗透特征,储层非均质性强,砂体分布规律认识不清,没有进行储层内部砂体的详细解剖以及三维地质模型建立的工作,严重制约着镇218区块油藏的进一步开发。本文针对这些问题,选取镇218区块作为研究对象,采用层次分析法对研究区储层的内部构型进行详细解剖,分不同构型要素单元求取低渗透储层的物性参数,建立镇218区块长8_1亚段的三维构型模型和三维储层属性模型,并采用不同的方法对模型进行了验证。主要取得了以下几个方面的成果及认识:(1)认为镇218区块长8_1亚段属于辫状河三角洲前缘沉积,砂体呈南西-北东方向展布,横向上分布范围广,砂体厚度大,常存在多期河道砂体垂向叠置的现象,有利于油气的储集。(2)镇218区块长8_1亚段储层内部砂体构型界面可细分为5级,其中,3-5级构型界面控制了内部级次化特征,3级界面限定了河道砂体内部增生体的范围,4级界面限定了单一河道砂体的范围,5级界面限定了复合砂体的规模。将研究区界面按沉积成因分为泥质、物性和钙质三种类型,建立出不同成因构型界面的测井识别标准。(3)阐明了镇218区块长8_1亚段储层内部级次化体系特征,概括出3种辫状河三角洲前缘单河道边界的识别方法,建立了砂体厚度与河道宽度之间的经验公式,将河道形成期次细化为5期,并识别出砂体五种类型的空间接触关系,对研究区辫状河三角洲前缘水下分流河道的构型模式进行详细分析。(4)建立出镇218区块低渗透储层的泥质含量、孔隙度、渗透率、含油饱和度等物性参数的测井解释模型,准确求出低渗透储层的物性参数;经过测井解释效果分析验证,孔隙度、渗透率参数精度较高、岩心分析化验误差明显减小、产液强度与渗透率参数匹配关系较好,试油试采符合率接近90%,本文测井解释结论更加合理。(5)分别建立了镇218区块两个井组长8_1亚段的三维构造模型、三维储层构型模型以及受储层构型约束的储层属性模型,并利用模型统计参数与输入参数概率分布一致性检验、油藏数值模拟检验、储层构型约束与非储层构型约束模型结果比较等手段,对模型进行验证,结果证明地质模型跟实际地质情况比较吻合,具有较高的精度。
[Abstract]:The reservoir of Chang8-1 submember of Zhenbei Yutianzhen block 218 has typical low permeability characteristics, strong reservoir heterogeneity, unclear understanding of sand body distribution law, and no detailed anatomy of sand body inside the reservoir and the establishment of 3D geological model. The further development of Zhen218 block reservoir is seriously restricted. Aiming at these problems, this paper selects Zhen218 block as the research object, uses the analytic hierarchy process (AHP) to dissect the internal configuration of the reservoir in the study area in detail, and calculates the physical parameters of the low permeability reservoir by different structural element units. Three dimensional configuration model and three dimensional reservoir attribute model of Chang 8s 1 submember of Zhen218 block are established, and different methods are used to verify the model. The main achievements and understandings are as follows: (1) it is considered that the Changzhou-1 submember of Zhen218 block belongs to braided river delta front sedimentation, the sand body is distributed in the direction of the south-west to the east, the transverse distribution is wide, and the thickness of the sand body is large. The phenomenon of vertical superposition of channel sand bodies in multiple periods is often observed, which is beneficial to oil and gas reservoir. (2) the internal sand body configuration interface of Chang 8-1 submember reservoir in Zhen218 block can be subdivided into 5 grades. Among them, the interface of order 3-5 controls the internal gradation characteristics. The interface of grade 3 defines the range of the accretive body in the channel sand body. The interface of grade 4 limits the range of the sand body of a single channel, and the interface of level 5 limits the scale of the composite sand body. According to the sedimentary origin, the interface of the study area is divided into three types: muddy, physical property and calcareous, and the logging identification criteria for the interfaces of different genetic configurations are established. (3) the characteristics of the internal grading system of Chang 8201 submember reservoir in Zhen218 block are expounded. Three methods for identifying the boundary of single channel in the front edge of braided river delta are summarized. The empirical formula between sand body thickness and channel width is established. The formation stage of the channel is subdivided into 5 periods, and five types of spatial contact relations of sand body are identified. The configuration model of underwater distributary channel in front of braided river delta in the study area is analyzed in detail. (4) the log interpretation model of physical parameters such as shale content, porosity, permeability, oil saturation and other physical parameters of low permeability reservoir in Zhen218 block is established. The physical parameters of low permeability reservoir are obtained accurately, the accuracy of porosity and permeability parameters is high, the error of core analysis is obviously reduced, and the matching relationship between liquid production intensity and permeability parameters is better. The coincidence rate of oil test and production test is close to 90, and the logging interpretation conclusion is more reasonable in this paper. (5) the 3D structural model, 3D reservoir configuration model and reservoir attribute model constrained by reservoir configuration are established, respectively. The model is verified by the consistency test of probability distribution between statistical parameters and input parameters, the test of reservoir numerical simulation, and the comparison of the results of reservoir configuration constraint and non-reservoir configuration constraint model. The results show that the geological model is in good agreement with the actual geological conditions and has high accuracy.
【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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