In-situ stress measurements by hydraulic fracturing and its implication on coalbed methane development in Western Guizhou, SW China
In-situ stress measurements by hydraulic fracturing and its implication on coalbed methane development in Western Guizhou, SW China
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黔西地区水力压裂地应力测量及其对煤层气开发的意义
DOI：
10.1016/j.juogr.2016.04.001
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发表时间：
2016-09-01
期刊：
影响因子：
--
通讯作者：
Gao, Wei
中科院分区：
文献类型：
--
作者：
Xu, Hongjie;Sang, Shuxun;Gao, Wei
根据在贵州西部中国西南部135.9~1243.6 m深度范围内独立测量和收集的资料，系统地分析了地应力的分布情况。回归分析得到最大水平主应力(Sigma(Hmax))、最小水平主应力(Sigma(Hmin))、垂直应力(Sigma(V))和侧压比随深度的变化。结果表明，水平应力的增长速度大于垂直应力的增长速度。Sigma(V)>；=sigma(Hmax)>；=sigma(Hmin)>；=sigma(Hmin)>；=sigma(V)主要出现在深部和浅至中煤层(400-600m和>；1000m)。最大和最小水平主应力与深度之比与深度呈线性关系，相关系数分别为0.77和0.85。煤层最大水平主应力与垂直应力之比一般在0.5~2.0之间，随着深度的增加而减小，接近1.0。平均侧向应力与深度的关系系数(Lambda)在浅部出现0.48~1.80的较大范围，然后随着深度的增加逐渐减小到一个固定值。注水/压降试验测得的煤渗透率表明，由于地应力带变化等原因，在550~750m深度范围内，渗透率受损，趋势差异较大。(C)2016爱思唯尔有限公司。保留所有权利。
Based on data independently measured and collected within depth from 135.9 to 1243.6 m in Western Guizhou, SW China, the distribution of in-situ stress was analyzed systematically. Maximum horizontal principal stress (sigma(Hmax)), minimum horizontal principal stress (sigma(Hmin)), vertical stress (sigma(v)) and lateral pressure ratio variations with depth were obtained by regression analysis. Results show that the growth rate of horizontal stresses is higher than that of vertical ones. Three types of stress field distribution have been noted that sigma(v)>=sigma(Hmax)>=sigma(Hmin) mainly occurs in shallow and intermediate to deep coal seams (=sigma(Hmin)>=sigma(v) mainly occurs in deep and shallow to intermediate coal seams (400-600 m and > 1000 m). The ratio of maximum and minimum horizontal principal stress versus depth shows linear relationships with a correlation coefficient of 0.77 and 0.85, separately. The ratio of the maximum horizontal principal stresses to vertical stress is usually between 0.5 and 2.0 in coal seams, and decreases as the depth increases and approaches 1.0. The coefficient of average lateral stress versus depth (lambda) is also illustrated, which shows a wide range at shallow sites from 0.48 to 1.80, and then gradually decreases to a fixed value as the depth increases. Coal permeability obtained during injection/falloff tests shows that the permeability is damaged with a trend difference under a depth of 550-750 m for the in-situ stress belting change and other reasons. (C) 2016 Elsevier Ltd. All rights reserved.