鄂尔多斯盆地韩城区块煤岩力学特征及可压性评价

Mechanical Characteristics and Compressibility Evaluation of Coal Rock in Hancheng Block of Ordos Basin

为评价鄂尔多斯盆地韩城区生气潜力和产能,完井后需要对该地区优质煤层进行可压裂性评价,为后期压裂改造和试气提供依据。采用客观的定性和定量方法,采用组合权重法和欧氏关联度建立可定量评价目标区煤岩储层可压裂性的数学模型。结果表明:储层具有多孔低渗、杨氏模量较高、泊松比中等、地应力差小、泥质与灰分含量中等、水分含量较低等特征,具备一定的煤层气勘探潜力和压裂改造条件。

In order to evaluate the gas potential and production capacity in Hancheng district of ordos basin,it is necessary to evaluate the frac ability of high-quality coal seam in this area after well completion,so as to provide a basis for later fracturing and gas testing.Objective qualitative and quantitative methods,combined weight method and Euclid correlation degree are used to establish a mathematical model for quantitatively evaluating the fracturing of coal reservoir in the target area.The results show that the reservoir has certain exploration potential of coalbed methane and fracturing condition with porous and hyperosmotic features,high Young′s modulus,medium Poisson′s ratio,small difference in ground stress,medium content of argillaceous and ash,and low content of water.