【摘要】 本文叙述了孔壁崩落应力测量方法。分析和讨论了冀中平原地区的10口深孔地层倾角和四臂测井资料,得出该地区的孔壁崩落的方向是V12°W。由此确定的最大水平主应力方向为N78°E。此外,还与其它几种应力测量方法所取得的结果进行比较,表明具有良好的一致性关系。最后根据在冀中平原地区所取得的应力方向的结果,说明该地区应力方向是受着同一构适应力场的作用,其动力源是来自太平洋板块向西俯冲的结果。更多还原

【Abstract】 This paper illustrates the stress measurement by the borehole breakout method. Data of stratigraphic dip angles obtained from 10 deep boreholes and a 4 -arm well in the central Hebei Plain areas are analysed and discussed in the paper. Our work shows the orientation of breakouts from the borehole walls in that area is N12°W. The maximum horizontal principal stress thus obtained is oriented N78°E. Result of our study is compared with those results by other stress-measurement methods, and very good agreement is achieved. In the light of the stress orientations obtained in the central Hebei Plain areas, it is suggested the stress orientations in that arca affected by the same tectonic stress field, the dynamic force source of which comes from the westward subduction of the Pacific plate.更多还原