摘要
深层致密砂岩储层抗剪强度参数特征测井评价对了解地层地质结构特征、钻完井施工、应力场模拟及裂缝预测等方面均具有重要参考价值。提出基于Hoek-Brown准则的致密砂岩抗剪强度参数测井解释方法,利用该方法对地层岩石内聚力(C)和内摩擦角(φ)进行测井解释。利用反算法准确提取致密砂岩岩样的H-B参数,分别利用单轴参数法、有效应力法及狭义H-B修正方法等3种H-B准则方法对岩石C、φ值进行预测并修正。修正后的各组岩石C、φ值与实测结果具有较好的一致性,C的平均绝对误差约为2.59MPa,φ的平均绝对误差约为1.26°。优选单轴参数法对单井致密砂岩目的层C和φ进行测井解释,测井解释结果与地层实际情况及岩样C、φ实测结果均具有较好的一致性,表明该方法有效实用。
There's important reference value of shear strength parameters well logging evaluation of deep tight sandstone reservoir in understanding the geological structural characteristics of rock mass,the drilling and completion operation,simulation of stress field and fracture prediction.In this paper,we proposed a shear strength parameters well logging evaluation method based on the Hoek-Brown criterion,and interprate C andφof formation using this method.Firstly,the algorithm is used to accurately extract the H-B parameters of samples,then,three H-B criterion methods are used to predict the Candφof formation,this three methods are uniaxial parameter method,the effective stress method and the special H-B correction method.The result shows that,the predicted results of Candφof samples using the H-B criterion is consistent well with the measured results,the average absolute error of Cis about 2.59 MPa,the average absolute error ofφ is about 1.26°. The uniaxial parameters method is optimized for single well interpretation of Candφof tight sandstone,the interpretation results have good consistency with the geological structure features of formation and the measured results of samples' Candφ,it shows that the presented method is effective and pratical.
出处
《测井技术》
CAS
CSCD
2016年第1期91-97,共7页
Well Logging Technology
基金
国家自然科学基金面上项目(41372139
41072098)
国家科技重大专项专题(2011ZX05018-001-002
2011ZX05009-002-205
2011ZX05033-004)
