深埋泥岩地层的最小主应力测定方法探讨

Investigation of minimum principal stresses within deeply buried mudstone strata

摘要: 结合理论分析与实际资料统计,根据泥岩地层在水力压裂垂直裂缝剖面中所占的比例大小和瞬时停泵压力的变化趋势,获得了鄂尔多斯盆地西峰地区长8层(2 100 m)和靖边地区盒8地层(3 000 m)的泥岩最小主应力,这可为油气钻采、压裂设计以及测井、地震资料解释提供参考依据。间接证据表明,利用该方法求取的泥岩地层地应力更符合实际情况。

Abstract: A new method has been introduced,based on theoretical analysis and actual data analysis.By analysizing percentage of mudstone in the hydraulic fracture profile and statistical trend that ISIP changes among selected wells,minimum principal stress inside buried mudstone strata(layers of Chang 8 at 2 100 m,Xifeng oil field and He 8 at 3 000 m,Jinbian gas field in Ordos Basin,China,are cited respectively) can be obtained.Final results indicated that the new way is more appropriate.