ABSTRACT:

The Erdos Basin is one of the most important energy bases in West China. There exist plenty of petroleum, natural gas, coal and coal-bed methane resources in the basin. Because the fossil fuel resources in the Erdos Basin play a very important role in China, the deep mining operation and production in the future in this area is a necessary option for the development of West China. The stress field is one fundamental factor influencing the deep mining. Through the borehole breakout logging, paleomagnetic orientation test, and differential stain analysis and rock specimen compression test, the orientation of the maximum principal stress is within the range of NE-NEE- nearly EW. Based on the focal mechanism data from earthquake events, the orientation of the maximum principal stress turns from NEE to nearly EW across the Erdos Basin from the west to the east. Based on the above research findings, the stress direction of the regional stress field should be NEE to nearly EW. The stress state should be favorable for the movement of strike slip faults. According to an analysis of the stress state, the deep mining production may suffer from the severe squeezing deformation, borehole breakouts, collapses, and other problems.

1 INTRODUCTION

The Shanghaimiao Coal Mine is located in the southwest of the Inner Mongolian Autonomous Region, on the northwestern edge of the Erdos basin, which is under the jurisdiction of the Shanghaimiao Town, Etuoke Front Banner, and located in the border zone between the Inner Mongolian and the Ningxia Hui Autonomous Regions. The Shanghaimiao Coal Mine is like a trapezoid, with the northern boundary of the banner boundary of Etuoke Front Banner, the southern and western boundaries of provincial boundaries between the Inner Mongolian and the Ningxia Hui Autonomous Regions, and the eastern boundary of Jurassic coal reservoir at the 1200 m deep. The whole area of this mine is about 1154 km2, with the south-to-north length of 67 km and the east-to-west length of 34 km. The area with coal deposition is about 850 km2.

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