塔里木盆地大北气田构造应力场解析与数值模拟
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中国石油杭州地质研究院,中国石油杭州地质研究院,中国石油杭州地质研究院,中国石油杭州地质研究院,中国石油杭州地质研究院,中国石油塔里木油田公司

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国家科技攻关计划


Analysis and Numerical Simulation of Tectonic Stress Field in the Dabei Gas Field, Tarim Basin
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PetroChina Hangzhou Research Institute of Geology,PetroChina Hangzhou Research Institute of Geology,PetroChina Hangzhou Research Institute of Geology,PetroChina Hangzhou Research Institute of Geology,PetroChina Hangzhou Research Institute of Geology,Tarim Oilfield Company, PetroChina

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    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σH>σh>σv和σH>σv>σh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:

    Study of tectonic stress field has theoretical and practical significance to understanding the development of the Dabei gas field in the Tarim Basin. Directions of paleoand present tectonic stress fields were determined using the strikes of regional fault and anticline’s long axis, trends of drilling induced fracture, and borehole breakout orientation. The magnitude of the tectonic stress was also calculated using well logging data. Based on above, geological models of Dabei 102 Block and Dabei 201 Block in the main gas pools of the Dabei gas field were established by ANSYS, a finite element modeling (FEM) software. Rock mechanical parameters were obtained through well logging data calculation and dynamicstatic conversion. And boundary condition was determined by tectonic stress field analysis results. Numerical simulation of paleo and present tectonic stress field of the Dabei gas field was finally performed to analyze the distribution regularity of tectonic stress field and the relationship between tectonic stress field and structural fracture and well capacity. The results show that the directions of paleoand present maximum horizontal principal stresses of the Dabei gas field are about NNW336° and NWW305° respectively, and the magnitudes of stresses are characteristic of σH>σh>σv(Type II) of paleostress and σH>σv>σh (Type III) of present stress, suggesting that they belong to type II and type III stresses. The values of principal stresses and deviator stress are horizontally low at the high spots of anticline and high on the limbs, and increase with the increasing depth vertically. Strike of structural fractures is controlled by the direction of horizontal maximum paleotectonic stress, and it is nearly parallel to or intersects in small angle with the direction of the present horizontal maximum principal stress. In this case, structural fractures can extend continuously along their strikes, and the aperture will not reduce dramatically as the tectonic compression, and therefore the validity of structural fractures can be well preserved. Development extent of structural fractures in gas pools is in positive correlation with deviator stress. The high spot of an anticline corresponds to the low value zone of tectonic stress, thus hydrocarbon tends to accumulate to form reservoir under the driving of stress potential difference and buoyancy. The wells with high deviator stress have higher development extent of structural fracture and therefore higher open flow capacity. Thus there will be a high probability to yield high production of natural gas if wells are deployed at the high spots of an anticline where have high deviator stress.

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王珂,张惠良,张荣虎,王俊鹏,刘春,杨学君.2017.塔里木盆地大北气田构造应力场解析与数值模拟[J].地质学报,91(11):2557-2572.
WANG Ke, ZHANG Huiliang, ZHANG Ronghu, WANG Junpeng, LIU Chun, YANG Xuejun.2017. Analysis and Numerical Simulation of Tectonic Stress Field in the Dabei Gas Field, Tarim Basin[J]. Acta Geologica Sinica,91(11):2557-2572.

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  • 收稿日期:2016-03-29
  • 最后修改日期:2016-12-01
  • 录用日期:2016-12-02
  • 在线发布日期: 2017-11-21
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