鄂尔多斯盆地中南部L区延10储集层三维地质建模研究

发布时间：2018-11-16 09:23

【摘要】：鄂尔多斯盆地陕北斜坡中南部L区延10储层是典型的低孔低渗储层,为了更好地揭示研究区延10储层的地质特征,预测砂体展布、砂顶构造及研究储层参数特征,本文对该区进行了三维地质建模研究。本文以鄂尔多斯盆地陕北斜坡中南部L区延10地层为研究对象,以沉积构造背景为基础。首先分析了研究区的地质概况;其次,基于前人研究地质资料,结合测井和岩心资料对L区开展了地层精细划分与对比研究,建立了精细地层对比格架,进而相继完成了砂体展布和砂顶构造研究、储层沉积微相研究、“四性关系”研究和地质条件约束下测井资料二次解释及储层非均质性研究;最后,对研究区开展三维地质建模研究。研究表明:L区延10可以分为延101和延102两个小层;研究区内目的层构造简单,整体呈东高西低特征,局部有低幅鼻状隆起和低洼;砂体展布方向总体呈北东—西南方向,其中延102砂体较为发育;研究区沉积相为辫状河沉积相,主要沉积微相有心滩,沉积河道和泛滥平原,各小层沉积相之间具有相似性、差异性及继承性;研究区延10主要为中粗砂岩为主,其中石英、长石含量较多,发育原生孔隙、粒间溶孔、粒内溶孔等孔隙,孔隙度一般在9%~16%,渗透率分布范围在(1.3~3.67)×10-3μm2,属低孔低渗油藏,并且根据孔隙度和声波时差的正相关性建立孔隙度解释模型为:Φ=0.1309Δt-18.473,渗透率与孔隙度的正相关性建立的渗透率解释模型为:K=0.0053e0.4534Φ;研究区的储层非均质性都比较强,延101的级差系数,突进系数,变异系数为23.13,5.64,0.82,延102的系数为23.06,6.96,0.9。最后,在沉积学、岩石地层学、地质统计学等理论指导下,在静态数据库建立的前提下,应用Petrel2009软件对L区进行了三维地质建模研究,采用序贯指示模拟和序贯高斯模拟法,建立了L区延10储层的构造模型、相模型、孔隙度模型、渗透率模型、含油饱和度模型,精细刻画了储层构造、沉积及属性的三维地质特征,模拟结果与地质认识相符,具有较高的可信性。本研究成果为研究区下步开发方案的制定奠定了重要的地质基础,有关研究方法适用于类似的油田地质研究。
[Abstract]:In order to better reveal the geological characteristics of Yan 10 reservoir, predict the distribution of sand body, sand roof structure and study reservoir parameters, Yan10 reservoir is a typical low porosity and low permeability reservoir in the central and southern part of Shanbei slope, Ordos Basin, in order to better reveal the geological characteristics of Yan 10 reservoir, predict the distribution of sand body, structure of sand roof and study the characteristics of reservoir parameters. In this paper, three-dimensional geological modeling in this area has been studied. In this paper, Yan 10 strata of L area in the central and southern part of northern Shaanxi slope in Ordos Basin are taken as the research object, and the sedimentary tectonic background is taken as the basis. First, the geological survey of the study area is analyzed. Secondly, based on the geological data of previous studies, combined with logging and core data, the fine stratigraphic division and correlation of L area were carried out, the fine stratigraphic correlation framework was established, and the sand body distribution and sand roof structure were studied successively. Reservoir sedimentary microfacies study, "four-sex relationship" study, logging data secondary interpretation and reservoir heterogeneity study under the constraints of geological conditions; Finally, three-dimensional geological modeling is carried out in the study area. The results show that Y10 of L area can be divided into two sub-layers: Yan 101 and Yan 102, the target layer in the study area is simple in structure, it is characterized by low east high and west low, and has low rhinoid uplift and low depression in local area. The distribution direction of sand body is generally northeast-southwest direction, in which Yen102 sand body is relatively developed; The sedimentary facies in the study area are braided river sedimentary facies, the main sedimentary microfacies are the core beach, the sedimentary channel and the flood plain, and the sedimentary facies of each layer are similar, different and inherited. In the study area Yan 10 is mainly composed of medium coarse sandstone, in which quartz and feldspar are more abundant. The primary pores, intergranular dissolved pores, intragranular dissolved pores, and so on are developed. The porosity is generally at 9 / 16 and the permeability distribution ranges from (1.3 to 3.67) 脳 10 ~ (-3) 渭 m ~ (2), and the distribution range of permeability is (1.3 ~ 3.67) 脳 10 ~ (-3) 渭 m ~ (2). It belongs to low porosity and low permeability reservoir. According to the positive correlation between porosity and acoustic time difference, the porosity interpretation model is established as follows: 桅 = 0.1309 螖 t-18.473.The permeability interpretation model established by positive correlation between permeability and porosity is: K=0.0053e0.4534 桅; The heterogeneity of reservoirs in the study area is relatively strong. The coefficient of differential, advance and variation of Yan101 is 23.1356.64 / 0.82, and the coefficient of Yan102 is 23.06/ 6.96/ 0. Finally, under the guidance of the theories of sedimentology, lithostratigraphy, geostatistics and so on, under the premise of the establishment of static database, the 3D geological modeling of L area was studied by using Petrel2009 software, and the sequential indicator simulation and sequential Gao Si simulation method were used. The structural model, facies model, porosity model, permeability model and oil saturation model of reservoir Yan 10 in L area are established. The 3D geological characteristics of reservoir structure, deposition and attributes are described in detail. The simulation results are consistent with geological understanding. Have high credibility. The results of this study have laid an important geological foundation for the formulation of the next development plan in the study area, and the relevant research methods are suitable for similar oilfield geological studies.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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