鄂尔多斯盆地东南部张夏组和三山子组储层特征研究

发布时间：2018-05-30 01:01

本文选题：鄂尔多斯盆地 + 寒武系　；参考：《成都理工大学》2015年硕士论文

【摘要】：鄂尔多斯盆地地处华北地台西部,作为我国重要的油气资源勘探区域,近年来一系列大型-特大型的油气田在这里被发现,下古生界的碳酸盐岩具有十分巨大的勘探研究潜力。前人的研究主要集中在下古生界奥陶系马家沟组中,对寒武系地层的研究还不是很完善。研究区位于鄂尔多斯盆地东南部,目前有多口井钻遇寒武系,但是总体上来看鄂尔多斯盆地东南部寒武系勘探程度较低,寒武系碳酸盐岩中至今未发现工业型气田,其油气地质条件研究仍处于起步阶段。因此对研究区寒武系储层进行储层特征研究,搞清楚储层岩石学特征,储层空间类型和物性特征对指导下一步油气勘探有着非常重要的意义。因此,本文以区内研究较少的中上寒武系张夏组和马家沟组的储层为研究对象,以《中国西部主要大型盆地碳酸盐岩油气勘探新领域及战略选区综合评价》项目为依托,采用了野外地质调查,钻井岩心观察描述,普通薄片和铸体薄片的观察和鉴定,孔渗测试等分析研究手段,系统的阐述了研究区内中上寒武系张夏组和三山子组的岩石学特征,孔隙发育特征,成岩作用的各种类型和演化阶段,在此基础上研究储层的控制因素。论文主要取得了一下几个成果和认识:①鄂尔多斯盆地东南部中上寒武系地层发育的主要岩性有粉-细晶白云岩、细—微晶云灰岩、亮—微晶生物屑砂屑灰岩、微晶灰岩、泥-微晶粉砂泥质云岩、鲕粒灰岩和鲕粒白云岩和细晶残余砂屑云岩等。②研究区的储层岩石在成岩过程中,经历的主要建设性成岩作用有:白云石化作用、岩溶(溶蚀)作用为主;主要的破坏性成岩作用有:压实—压溶作用、胶结作用、充填作用、交代作用、重结晶作用等。③以研究区建设性成岩作用和破坏性成岩作用类型为基础,结合成岩过程中埋藏深度的变化,划分出四个成岩演化阶段,分别为准同生成岩阶段、表生成岩阶段、早成岩阶段、晚成岩阶段。④研究区中上寒武系地层发育的主要孔隙有晶间孔、晶间溶孔及少量的粒内溶孔、粒间溶孔以及溶蚀缝和构造破裂缝。各种次生孔隙是储层的储集空间,各种裂缝是主要的渗滤通道。⑤研究区储层发育主要受沉积相、白云岩化作用、溶蚀作用和构造破裂作用等几个因素的控制。
[Abstract]:Ordos Basin is located in the western part of North China platform. As an important exploration area of oil and gas resources in China, a series of large and super large oil and gas fields have been discovered here in recent years. Carbonate rocks of lower Paleozoic have great potential for exploration and research. Previous studies mainly focus on the Lower Paleozoic Ordovician Majiagou formation, and the Cambrian strata are not well studied. The study area is located in the southeast of Ordos Basin. At present, there are many wells drilling and meeting Cambrian, but generally speaking, the degree of Cambrian exploration in the southeast of Ordos Basin is relatively low, so far no industrial gas fields have been found in Cambrian carbonate rocks. The study of oil and gas geological conditions is still in its infancy. Therefore, it is very important to study the reservoir characteristics of Cambrian reservoirs in the study area, to find out the petrological characteristics of reservoirs, the spatial types and physical properties of reservoirs to guide the further exploration of oil and gas. Therefore, this paper takes the reservoirs of the middle and upper Cambrian Zhangxia formation and Majiagou formation, which are less studied in this area, as the research object, and relies on the project "Comprehensive Evaluation of the New Field and Strategic constituency of Carbonate Exploration in the main large basins in Western China". The petrological characteristics of the Zhangxia formation and Sanshanzi formation of the middle and upper Cambrian in the study area are systematically expounded by means of field geological investigation, observation and description of drilling core, observation and identification of ordinary and cast sheet, pore permeability test, etc. On the basis of pore development characteristics, diagenesis types and evolution stages, the controlling factors of reservoir are studied. The main lithology of the middle and upper Cambrian strata developed in the southeastern part of the W 1 Ordos Basin are: powder-fine-grained dolomite, fine-microcrystalline dolomite, bright microcrystalline bioclastic sandstone limestone, microcrystalline limestone. The main constructive diagenesis of the reservoir rocks in the study area such as mud-microcrystalline silty dolomite, oolitic limestone, oolitic dolomite and fine grain residual sandstone dolomite are: dolomitization, etc. The main destructive diagenesis are compact-pressure dissolution cementation filling and metasomatism. Based on the types of constructive diagenesis and destructive diagenesis in the study area and the variation of burial depth during diagenesis, recrystallization is divided into four diagenetic stages, which are quasi-syngenic stages. The main pores developed in the middle and upper Cambrian strata in the study area are intergranular pore, intergranular dissolved pore and a small amount of intragranular dissolved pore, intergranular dissolved pore, dissolution fracture and structural fracture in the middle and upper Cambrian strata of the study area in the stage of epigenetic rock formation, early diagenetic stage and late diagenetic stage. All kinds of secondary pores are reservoir space, and various fractures are the main percolation channel. 5. The reservoir development is mainly controlled by several factors, such as sedimentary facies, dolomization, dissolution and tectonic fracture.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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