基于常规测井数据计算储层岩石力学参数——以鄂尔多斯盆地上古生界为例

泊松比及杨氏模量等岩石力学参数是盆地构造应力场模拟、油气田钻完井及储层压裂改造设计的基础参数。在岩石力学实验研究及纵、横声波时差关系研究的基础上，针对鄂尔多斯盆地上古生界储层确定了基于常规测井资料计算横波时差关系式的待定系数A、B、C，通过最小二乘法拟合的3个待定系数值分别为2.74、25.45、-370.16，基于待定系数计算公式求取的横波时差与实测横波时差具有较好的一致性。通过该方法计算出研究区上古生界储层杨氏模量在35593~37997 MPa之间，泊松比在0.21~0.25之间。研究区岩石力学参数计算公式的确定及岩石力学参数计算为鄂尔多斯盆地气田勘探开发提供了数据基础。 

ROCK MECHANICS PARAMETER CALCULATION BASED ON CONVENTIONAL LOGGING DATA: A CASE STUDY OF UPPER PALEOZOIC IN ORDOS BASIN

As the rock mechanics parameters such as Young modulus and Poisson ration are the basic data for drilling and completion as well as design for reservoir fracturing in oil field, and for simulation of tectonic stress field in sedimentary basin, it is the key contents that obtain rock mechanic parameters during petroleum exploration and development. Based on rock mechanic test and relations study between compressional wave slowness and shear wave slowness, this paper established the undetermined coefficients of the formula for shear wave slowness based on conventional logging data. The values obtained through the least square method for the three undetermined coefficients A, B and C are 2.74, 25.45, -370.16 respectively. The calculated shear wave slowness is consistent to the tested ones. Based on the calculated method, the results of Young modulus and Poisson ration of the Upper Paleozoic of Ordos Basin are range from 35593 MPa to 37997 MPa and from 0.21 to 0.25 respectively. The establishment of the formula for the rock mechanics and the study on the rock mechanical parameters laid a theoretical foundation on the research work of gas field exploration and development.