用钻孔崩落推断四川盆地的水平主应力方向
HORIZONTAL PRINCIPAL STRESS AXES IN SICHUAN BASIN DEDUCED FROM OIL-WELL BREAKOUTS
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摘要: 利用法国斯仑贝谢公司在我国四川油气井服务时所作的四臂井径测井曲线,分析了四川盆地中井位附近的地壳水平主应力方向.共分析了12口井的井径测量曲线,测量深度从地表下约2,000m至4,700m,各井的测量段从50m左右至1,360m不等.编制了对测量曲线采样、插值并作简单统计处理,从而获得崩落孔孔径平面投影图的计算机程序.处理结果表明,大多数孔显示了NNW-SSE或近N-S向的优势崩落方向,说明四川盆地最小水平主应力即为此方向.此结果与由平均震源机制结果得出的四川附近地壳区域应力场图象大体协调一致.Abstract: Schlumberger company conducted well logging service in China's Sichuan oil field. Four-arm caliper logging records at 12 wells are available to us for the purpose of crustal stress study. The logging depths are generally from 2,000 down to 4,500 meters beneath the ground surface,with different logging intervals. The longest interval is more than 1,300 meters.The logging records are digitized,and plotted to get plane projections of the measured well-diameter for the whole logged intervals. Most projections show prominent elongation of the well bores in the NNW-SSE or nearly N-S direction. Following the common explanation that in the direction of elongation lies the minimum horizontal principal stress axis,we get the feature of the stress axis orientations in the Sichuan basin which gererally agrees with the pattern of regional tectonic stress in Sichuan and the surrounding regions obtained from composite focal mechanism analysis.
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[10] H aimson, B. C, and H errick, C. G., In situ stress evaluation from borehole breakouts experimental studies, in Proceedings of the 26th'US Symposium on Rock Mechanics, Rapid City,South Dakota, 26——28, June 1985, 1207——1218.[1] 闲荣举、张四昌、晏凤桐、俞林胜,1977.我国西南地区现代构造应力场与现代构造活动特征的探讨.地球物理
[2] 学报,20.96——108.
[3] 成尔林,1981.四川及其邻区现代构造应力场和现代构造运动特征.地震学报,3.231——241.
[4] 许忠淮、汪素云、黄雨蕊、高阿甲、金小峰、常向东,1987.由多个小震推断的青甘和川滇地区地壳应力场的方向特征.地球物理学报,30.476——486,
[5] Gough, D.I. and Bell, J. S., 1982. Stress orientation from borehole wall fractures with exaritple from Colorado, east Texas and northern Canada. Canadian Journal of Earth Scienier, 19, 7,1358——1370.
[6] 丁健民、梁国平、郭启良、高建理、曹守月、贾振先、景朝晖、杨继林,1987.根据钻孔崩落椭圆确定地壳应力方向.地震学报,9. 143——153.
[7] Plumb, R. A. and Cox, J. W., 1987. Stress directions in eastern north America determined to 4.5 km from borehole elongation. J. Geophys.Res., 92, B6, 4805——4816.
[8] 谭廷栋,1986.地层倾角测井在隐蔽油气藏勘探中的应用.石油物探,25, 3, 87——9 8.
[9] 夏国辉、郑双良、吴莉兰、张凤玉、魏宏,1988, 1980年代中国地磁正常场图及其数学模式.地球物理学报,31,82——89.
[10] H aimson, B. C, and H errick, C. G., In situ stress evaluation from borehole breakouts experimental studies, in Proceedings of the 26th'US Symposium on Rock Mechanics, Rapid City,South Dakota, 26——28, June 1985, 1207——1218.
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