化子坪张岔地区地质特征与注水开发方案研究

发布时间：2018-03-06 17:55

本文选题：井网　切入点：压力系统　出处：《西北大学》2015年硕士论文　论文类型：学位论文

【摘要】：化子坪张岔油区位于鄂尔多斯陕北斜坡中部,其延长组长6油层是本区主要的开发层系。经过长年实践证明,化子坪张岔地区长6油藏地层能量低,开发效率低下,因此急需补充地层能量,提高采油效率。研究区试着在2010年小范围的开始注水,并收到了一定成效,但在开发过程中,由于地质情况认识不清,开发方案不合理,导致出现许多问题。本文在原有地质认识基础上,对地质特征进行重新研究,划分开发层系,并对井网进行合理调整,解决注入水水质问题,选择合理的注水时机,建立合理的注采压力系统。本文在对区域地质认识的基础上,结合岩石学和测井学科理论,对研究区进行地层划分和对比,编制顶面构造图,分析其构造特征,研究区只存在因差异压实而引起的局部鼻状隆起。此外,依据野外剖面和岩心资料,结合测井响应特征,开展沉积相分析,认为研究区长6主要为三角洲前缘亚相沉积,主要包括水下分流河道、河口坝、前缘席状砂、天然堤、分流间湾五种沉积微相。进而通过砂体平面展布特征,分析沉积微相展布及其演化特征。随后对其储层特征和油藏特征展开研究。铸体薄片和扫描电镜分析结果表明,研究区长6主要以长石砂岩为主,孔隙类型以溶蚀粒间孔和粒内溶孔为主,储层物性比较差。储层敏感性分析测试结果表明主要为弱水敏、弱速敏、弱碱敏和中等酸敏。长6油藏圈闭类型主要为岩性圈闭。基于上述研究成果,分析认为,研究区长6划分为一个开发层系较为合理。此外,通过对注气和注水两种补充能量开发方式的对比分析,确定研究区长6注水开发的可行性。最后,对研究区长6井网进行研究,确定研究区合理的井网形式是棱形反九点井网,合理的井网密度为14口/km2、井排方向与裂缝方向一致为NE510～NE68.70。此外对注采压力系统进行分析,确定最大井底注入压力为19.28MP a、最大井口注入压力为11.5MPa,合理地层保持压力为6.21MPaP8MPa,采油井合理流压为1.7MPa～2.26MPa,生产压差为4.7MPa～5.3MPa。最后在地质研究和注水开发技术研究基础上,对研究区进行调整部署,并预测开发效果。
[Abstract]:The Huaziping Zhangcha oil area is located in the middle of the northern slope of Ordos, and its Yanchang formation 6 is the main development layer in this area. It has been proved through years of practice that the Chang-6 reservoir in Huazipingzhangcha area has low formation energy and low development efficiency. Therefore, it is urgent to replenish the formation energy and improve the oil recovery efficiency. The research area tried to inject water in a small area in 2010, and achieved certain results. However, in the course of development, due to the unclear understanding of the geological conditions, the development plan is unreasonable. On the basis of the original geological knowledge, this paper restudies the geological characteristics, divides the development layers, adjusts the well pattern reasonably, solves the water quality problem of injected water, and selects the reasonable water injection time. A reasonable injection-production pressure system is established. Based on the understanding of regional geology and the theory of petrology and logging, the stratigraphic division and correlation of the study area are carried out, the top structural map is compiled and its structural characteristics are analyzed. In addition, according to field profile and core data and well logging response characteristics, sedimentary facies analysis is carried out. It is considered that Chang 6 in the study area is mainly delta front subfacies. It mainly includes five kinds of sedimentary microfacies, such as underwater distributary channel, estuarine dam, front mat sand, natural embankment and interdistributary bay. The distribution and evolution of sedimentary microfacies were analyzed. The reservoir characteristics and reservoir characteristics were studied. The results of casting thin slice and scanning electron microscope showed that Chang6 was mainly composed of feldspathic sandstone. The pore types are mainly intergranular and intragranular dissolution pores, and the reservoir physical properties are poor. The results of reservoir sensitivity analysis show that the reservoir sensitivity is mainly weak water sensitivity and weak velocity sensitivity. The trap type of Chang 6 reservoir is mainly lithologic trap. Based on the above research results, it is considered that Chang-6 reservoir is divided into a development series reasonably. Through the comparative analysis of the two supplementary energy development modes of gas injection and water injection, the feasibility of water injection development of Chang6 well in the research area is determined. Finally, the pattern of Chang-6 well in the research area is studied, and the reasonable pattern of well pattern in the research area is determined to be an inverse nine-spot pattern. The reasonable density of well pattern is 14 / km ~ 2 and the direction of well row and fracture is NE510 / NE68.70. In addition, the injection-production pressure system is analyzed. The maximum bottom hole injection pressure is 19.28 MPA, the maximum wellhead injection pressure is 11.5 MPA, the reasonable formation retention pressure is 6.21 MPa P8 MPa, the reasonable flow pressure is 1.7 MPA / 2. 26 MPa, and the production pressure difference is 4.7 MPA / 2. 3 MPa. Finally, on the basis of geological research and water injection development technology, Adjust and deploy the research area and predict the development effect.
【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;TE357.6

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