塔里木盆地大北气田构造应力场解析与数值模拟
发布时间：2019-03-06 15:00
【摘要】：构造应力场研究对于塔里木盆地大北气田的开发具有重要理论与现实意义。通过区域断裂与背斜长轴走向、钻井诱导缝走向与井壁坍塌方位分别确定了古、今构造应力场的方向,采用测井资料计算了古、今构造应力场的大小。在此基础上,利用ANSYS有限元分析软件建立了大北气田主体气藏区大北102区块和大北201区块的地质模型,并通过测井资料计算及动静态转换确定岩石力学参数,利用构造应力场解析结果确定边界条件,进行了大北气田古今构造应力场的数值模拟,分析了构造应力场的分布规律以及构造应力场与构造裂缝和产能的关系。结果表明:大北气田古、今水平最大主应力方向分别约NNW336°和NWW305°,应力大小分别具有σHσhσv和σHσvσh的特征,分别属于Ⅱ类和Ⅲ类地应力;主应力和主差应力在平面上表现为背斜高部位为低值、翼部为高值,纵向上随深度增加而增大;构造裂缝的走向受控于水平最大古构造应力方向,与现今水平最大主应力方向近似平行或呈小角度相交,构造裂缝可沿走向继续延伸,开度也不会因构造挤压作用大幅降低,有效性可得到很好的保存,气藏区构造裂缝发育程度与主差应力的大小呈正相关关系;背斜高点是构造应力的低值区,油气在应力势差和浮力的共同驱动下聚集成藏,其中主差应力较大的井点构造裂缝较发育,无阻流量较高,因此在背斜高点主差应力较大的区域部署井位,有较大概率获得天然气的高产。
[Abstract]:The study of tectonic stress field is of great theoretical and practical significance for the development of Dabei gas field in Tarim Basin. The direction of paleo-and present-day tectonic stress field is determined by regional fault and anticline long-axis strike, drilling-induced fracture strike and wellbore collapse orientation, and the magnitude of paleo-and present-day tectonic stress field is calculated by using logging data. On this basis, the geological models of Dabei 102 block and Dabei 201 block in the main gas reservoir area of Dabei gas field are established by using ANSYS finite element analysis software, and the rock mechanics parameters are determined by logging data calculation and dynamic and static transformation. The numerical simulation of the ancient and modern tectonic stress field in Dabei gas field is carried out by using the analytical results of the tectonic stress field to determine the boundary conditions. The distribution of the tectonic stress field and the relationship between the tectonic stress field and the tectonic fracture and productivity are analyzed. The results show that the direction of the maximum principal stress at present level is about NNW336 掳and NWW305 掳, respectively, and the stress is characterized by 蟽 H 蟽 h 蟽 v and 蟽 H 蟽 v 蟽 h, respectively, belonging to type 鈪，
本文编号：2435631
[Abstract]:The study of tectonic stress field is of great theoretical and practical significance for the development of Dabei gas field in Tarim Basin. The direction of paleo-and present-day tectonic stress field is determined by regional fault and anticline long-axis strike, drilling-induced fracture strike and wellbore collapse orientation, and the magnitude of paleo-and present-day tectonic stress field is calculated by using logging data. On this basis, the geological models of Dabei 102 block and Dabei 201 block in the main gas reservoir area of Dabei gas field are established by using ANSYS finite element analysis software, and the rock mechanics parameters are determined by logging data calculation and dynamic and static transformation. The numerical simulation of the ancient and modern tectonic stress field in Dabei gas field is carried out by using the analytical results of the tectonic stress field to determine the boundary conditions. The distribution of the tectonic stress field and the relationship between the tectonic stress field and the tectonic fracture and productivity are analyzed. The results show that the direction of the maximum principal stress at present level is about NNW336 掳and NWW305 掳, respectively, and the stress is characterized by 蟽 H 蟽 h 蟽 v and 蟽 H 蟽 v 蟽 h, respectively, belonging to type 鈪，
本文编号：2435631
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