RESEARCH ON THE GROUND STRESS CORRECTION OF RESERVOIRS BASED ON THE FINITE ELEMENT METHOD
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摘要: 地应力是油气储层评价的基础参数，传统常用的单井地应力求解往往只依托于测井数据及岩石力学实验，未考虑整体力学模型中地层岩石非均质性对地应力的影响。研究以准噶尔盆地中部4区块董11井为例，采用整体力学模型分析的方法对目的储层地应力进行修正。根据地层岩石的物理性质及岩石力学参数对井场周围地区进行划分及整体三维建模，并用ANSYS有限元软件对其整体模型进行力学分析，从而对地应力计算结果进行修正，得出研究区目的层地应力分布情况。研究结果表明，修正后的地应力值与修正前的地应力值在地层薄弱（坚硬）层段水平最小主应力值相差16%~17%左右，水平最大主应力值相差22%~23%左右。修正后的地应力可以很好地体现地层在沉积过程中造成的岩石物理性质非均质性对地应力非均质性的影响，反映了储层地应力的真实变化特征。Abstract: Ground stress is the basic parameter for oil and gas reservoir evaluation. The traditional solution of ground stress of single well usually relies on logging data and rock mechanics experiments, without considering the effect of formation rock heterogeneity on ground stress in the whole mechanical model. Therefore, Well Dong 11 in Block 4 in the middle of the Junggar Basin is taken as an example to correct the ground stress of the target reservoir with the analysis method of global mechanics model in this study, then the division of the area around the well site and 3D modeling of the whole well were based on the physical properties of formation rocks and rock mechanics parameters, and the ground stress distribution situation of the target in the study area was obtained with the correction in calculation results of ground stress through mechanical analysis of the integrated model by using the finite element software ANSYS. The results show that the difference value of the level interval minimum principal stress between before correction and after correction in the weak (firm) stratum is about 16%~17%, and that of the maximum principal stress value is about 22%~23%. The corrected ground stress can well reflect the influence of the heterogeneity of rock physical properties on the heterogeneity of ground stress, and reflect the real variation characteristics of reservoir ground stress.
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表 1 董11井原始测井数据
Table 1. Original logging data of the well Dong 11
层号 顶界深度/m 底界深度/m 层厚/m 纵波时差/(μs/ft) 密度/(g/cm3) 结论 1 4881.7 4883.1 1.4 62.69 2.46 干层 2 4896.5 4904.6 8.1 60.48 2.36 含油水层 3 4948.2 4950.1 1.9 60.22 2.41 干层 4 4960 4962.1 2.1 60.64 2.22 干层 5 4969.6 4970.6 1 64.28 2.13 干层 6 4980.9 4989.3 8.4 61.5 2.37 差油层 7 4993.2 5011.6 18.4 59.87 2.26 含油水层 8 5012.5 5019.2 6.7 60.66 2.39 含油水层 9 5020.9 5027.9 7 61.13 2.39 干层 
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表 2 董11井地层岩石物理参数及地应力计算结果
Table 2. Calculation results of formation rock physical parameters and ground stress of the well Dong 11
层号 横波时差/(μs/ft) 泊松比 杨氏模量/MPa 静态泊松比 静态杨氏模量/MPa 垂向应力/MPa 水平最大主应力/MPa 水平最小主应力/MPa 1 123.242209 0.325465 39925.5 0.207738 30865.54 112.2952 134.2244 103.3246 2 122.771372 0.339779 39013.7 0.211307 30199.91 112.71265 135.7413 104.0711 3 120.249713 0.332629 41307.1 0.209524 31874.06 113.83045 136.9144 104.782 4 129.550533 0.359714 33449.4 0.216277 26137.97 114.10415 138.0337 106.2004 5 142.575909 0.37244 26745.3 0.219449 21243.94 114.3123 137.7953 107.2011 6 124.423321 0.33835 38104.9 0.210951 29536.48 114.6573 137.7719 105.9069 7 125.946987 0.354034 35878 0.214861 27910.86 115.0552 139.2071 106.7745 8 121.915141 0.335491 39938.3 0.210238 30874.87 115.36455 138.7411 106.3589 9 122.859752 0.335491 39326.5 0.210238 30428.27 115.5612 138.8552 106.5873
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