胡尖山油田长9储层特征及含油性控制因素研究

发布时间：2019-05-23 04:13

【摘要】：胡尖山地区位于鄂尔多斯盆地伊陕斜坡的中西部,也是整个鄂尔多斯的重要油气产区之一。区内含油层系较多,为长8、长7、长6、长3及侏罗系多油层复合含油区,建产规模逐渐扩大,显示了胡尖山地区良好的勘探前景。胡尖山长9为近年来新发现层系,深入研究胡尖山地区长9储层特征及含油性控制因素,对该区层下一步的勘探开发具有重要的指导意义。本次研究是在前人研究的基础之上,结合岩心资料、测井资料、分析测试资料以及试油资料,以沉积岩石学、测井地质学、石油地质学等学科理论为指导,综合区域地质背景,对胡尖山地区长9段的沉积相、储层地质特征以及含油性控制因素等进行了研究,并在此基础上提出产建有利区带。研究认为,胡尖山地区长9层位构造趋于缓和,数条近东西向的低幅鼻隆状次一级构造在单斜构造背景下良好的发育；其自北向南由三角洲平原亚相,顺河道走向过渡为水下还原性相态,即三角洲前缘亚相构成了研究区长9储层的三角洲沉积相的亚相态,分流河道、水下分流河道、陆上天然堤、水下天然堤、分流间湾、沼泽等沉积微相等可通过多种表征参数细化确定下来；沉积演化多样。灰白色、灰绿色中-细粒长石砂岩为本区长9层砂岩的主要组成,绿泥石、硅质以及铁方解石等多种矿物组成了砂岩填隙物；粒间孔和长石溶孔为主要的岩石储集体的孔隙空间；研究区长9砂岩成岩作用类型有机械压实作用、压溶作用、胶结作用、溶解作用以及交代作用,成岩作用已进入中成岩阶段A期；研究区长9孔隙度平均值为9.87%,渗透率平均值为0.847×10-3μm2,属于低孔、特低孔-特低渗储层。研究表明：长7良好的烃源岩为胡尖山地区长9油藏提供油源；河道砂体是油气赋集的重要场所；砂岩透镜体和上倾方向的岩性遮挡条件是油气保存和赋集的保证；叠合连片的河道砂体和裂缝体系是油气运移的主要通道。结合以上研究,最终总结了研究区长9油藏含油性控制因素。
[Abstract]:Hujianshan area is located in the central and western part of the Yishan slope of Ordos Basin, and it is also one of the important oil and gas producing areas in Ordos Basin. There are many oil-bearing series in this area, which are Chang8, Chang7, Chang6, Chang 3 and Jurassic multi-reservoir composite oil-bearing areas, and the scale of construction is gradually expanded, which shows a good exploration prospect in Hujianshan area. Hu Jianshan Chang 9 is a newly discovered strata in recent years. The characteristics of Chang 9 reservoir and the controlling factors of oil content in Hujian Mountain area are deeply studied, which is of great guiding significance for the next exploration and development of this area. On the basis of previous studies, combined with core data, logging data, analysis test data and oil test data, this study is guided by sedimentary petrology, logging geology, petroleum geology and other disciplines, and synthesizes the regional geological background. The sedimentary facies, reservoir geological characteristics and oil-bearing controlling factors of Chang 9 member in Hujianshan area are studied, and on this basis, the favorable zone of production and construction is put forward. It is considered that the Chang9 layer structure in Hujianshan area tends to be relaxed, and several low amplitude nasal uplift secondary structures in the near east-west direction develop well in the background of monoclinic structure. From north to south, it is transformed from Delta plain subphase to underwater reductive phase along the channel, that is to say, the delta front subphase constitutes the subphase state, shunt channel and underwater shunt channel of the delta sedimentary phase of Chang9 reservoir in the study area. The sedimentary microfacies such as land natural embankment, underwater natural embankment, shunt bay, swampy and so on can be determined by a variety of characterization parameters. Sedimentary evolution is diverse. Grayish-white, grayish-green medium-fine feldspar sandstone is the main composition of Chang9 sandstone in this area, and many minerals such as chlorite, siliceous and iron calcite constitute sandstone filling. Intergranular pores and feldspar dissolved pores are the main pore spaces of rock reservoirs. The diagenetic types of Chang9 sandstone in the study area are mechanical compaction, cementation, dissolution and metasomatism. Diagenetic process has entered the middle diagenetic stage A. The average porosity of 9 in the study area is 9.87%, and the average permeability is 0.847 脳 10 ~ (- 3) 渭 m ~ 2. It belongs to low porosity, ultra-low porosity and ultra-low permeability reservoir. The results show that the good source rocks of Chang 7 provide oil source for Chang 9 reservoir in Hujianshan area, the channel sand body is an important place for oil and gas accumulation, and the lithologic occlusion conditions of sandstone lens and updip direction are the guarantee of oil and gas preservation and accumulation. Superimposed channel sand bodies and fracture systems are the main channels for oil and gas migration. Combined with the above research, the controlling factors of oil content in Chang 9 reservoir in the study area are summarized.
【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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