B地区长6油藏裂缝分布规律研究

发布时间：2018-04-04 13:06

本文选题：储层　切入点：裂缝　出处：《西安石油大学》2017年硕士论文

【摘要】：裂缝是影响致密砂岩储层高产及稳产的关键。在对国内外该类储层裂缝研究现状系统调研及近期成果全面分析的基础上,深入分析了裂缝的类型及形成机理[1]。本文通过油藏储层连通性、井间示踪剂、干扰试井、水驱前缘测试等与动态相结合的方式对见水方向准确识别,并对裂缝贯通区井网加密方法进行了研究。主要结论如下:(1)研究区裂缝主要是在燕山期形成的E-W向、S-N向裂缝和喜山期形成的NE向裂缝。现今构造应力场在盆地内部的的最大水平主应力方向是北西向,因此,在现今构造应力场的作用下,最大水平主应力方向和北西向的裂缝平行,具有较高的开启程度。(2)通过对动静态裂缝测试技术(示踪剂测试、干扰试井、水驱前缘测试、注水指示曲线测试、吸水剖面测试等),并结合油田生产动态及砂体连通情况,判定B209区高渗带33条,裂缝28条;B216区高渗带11条,裂缝6条;B155区高渗带19条,裂缝19条。(3)研究区裂缝见水受北东-南西向现代应力场控制作用明显;同时裂缝具有一定的相控规律,水下浊积扇扇中边部裂缝相对发育;随着开发的进行,在注水过程中应力“均一化”,与现代应力场共轭方向裂缝容易开启导致见水。(4)目前井网适应性分析表明,各区块裂缝与井网基本适配,建议对水淹区,进行局部井网调整,菱形反九点井网通过变排距的加密井网调整,五点法井网采用等排距加密线状注水,并对各区提出了加密井位的建议。
[Abstract]:Fracture is the key to the high and stable production of tight sandstone reservoir.On the basis of systematic investigation and comprehensive analysis of the current situation of fracture research in this kind of reservoir at home and abroad and comprehensive analysis of recent achievements, the types and formation mechanism of fractures are analyzed in depth [1].In this paper, through the combination of reservoir connectivity, interwell tracer, interference well testing, water drive front test and dynamic test, the direction of water discovery is accurately identified, and the method of infilling well pattern in fracture through area is studied.The main conclusions are as follows: (1) the fractures in the study area are mainly E-W trending S-N fractures formed in the Yanshanian period and NE fractures formed in the Himalayan period.The maximum horizontal principal stress direction of the present tectonic stress field in the basin is NW, therefore, under the action of the present tectonic stress field, the maximum horizontal principal stress direction is parallel to the NW fracture.It has a high degree of opening. It combines the dynamic and static fracture testing technology (tracer test, interference well test, water drive leading edge test, water injection indication curve test, water absorption profile test, etc.) with oilfield production performance and sand body connectivity.33 hypertonic zones in B209 area, 11 hyperosmotic zones in 28 fractures, 19 hypertonic zones in B155 area and 19 fractures in B155 area.At the same time, the fracture has certain phase control law, and the fracture in the middle edge of the turbidite fan is relatively developed, and with the development, the stress is "homogenized" in the process of water injection.The adaptability analysis of well pattern at present shows that the fractures in each block are basically suitable for well pattern, and it is suggested that local well pattern adjustment should be carried out for waterflooded area.The rhombus inverse nine-spot well pattern is adjusted by the infilled well pattern with variable spacing, and the five-point well pattern is infilled with equal spacing infill linear water injection, and the suggestions of infill well location are put forward for each district.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE31

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