| 山东渤海沿岸地区深部应力测量——主应力大小的测定 |
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| 引用本文： | 丁健民,梁国平,郭启良. 山东渤海沿岸地区深部应力测量——主应力大小的测定[J]. 防灾减灾工程学报, 1986, 0(2) |
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| 作者姓名： | 丁健民 梁国平 郭启良 |
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| 作者单位： | 国家地震局地壳应力研究所，国家地震局地壳应力研究所，国家地震局地壳应力研究所 |
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| 摘 要： | 本文研究了油井水力压裂应力测量的力学机制和测量方法.讨论了油井套管和井壁裂隙对测定应力大小的影响.作者指出,这种影响只存在于井壁及其附近的较小范围之内,而随着距中心孔距离的增加,其附加应力场的影响则逐渐减弱.由于油井压裂所导致的廷伸裂缝的长度远远超出附加应力场的影响范围,因此延伸裂缝的形成只与远场应力相关.由13口油井的水力压裂应力测量结果表明,在1300-3300米深度范围内,三向主应力值随深度的线性变化关系为:S_H=-66+0.29H,S_(it)=-124+0.23H,Sv=0.21H,这表明该地区的水平应力起主导作用,断层活动归属于走向滑动类型.
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CORRECTION OF CALIBRATING FUNCTION OF MAGNITUDE M_L FROM REGIONAL SEISMIC NETWORK IN HUBEI |
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| Abstract: | There are two ways to correct the calibrating function of magnitude M_L. The first one directly uses the magnitude residual error method, the other is by studying the average attenuation feature of maximum amplitude. In this paper, both methods are used to correct the M_L calibrating function from the regional seismic network in Hubei. Result show that the application of new calibrating function and the station correction can steadily reduce the measuring error of magnitude M_L from 0.28 to 0.22. It seems that the using of both methods may make up for the shortage of each one, so the regional feature of M_L calibrating function can be effectively reflected. |
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