Estimation of in-situ stresses by using Hydraulic fracturing and welllogging data in Shizhuangnan coalbed methane field

摘要

This paper focuses on the research of the vertical and regional distributions of stress characteristics in the Shizhuangnan coalbed methane field, southeastern Ordos basin. The minimum and maximum horizontal stresses were firstly calculated by the breakdown pressure, closure pressure and tensile strength of the fracturing data of key wells. Then the calculated results are compared with the results calculated from the natural gamma-ray, density and acoustic logging dau and Anderson's Model. Based on the comparison, the residual stress in the Anderson's Model is corrected. By adding the residual stress data in the Anderson's Model, the modified model can be well used for evaluating the stress characteristics in the area with complex structure types. Finalh. the distribution of stress characteristics in the Shizhuangnan coalbed methane field were evaluated by using the modified Anderson model.