羌塘盆地岩石物理力学特性分析及其孔壁稳定技术

Analysis on Rock Physical and Mechanical Properties and the Mud Stability Technology for Borehole Wall in Qiangtang Basin

摘要:

羌塘盆地是青藏高原年平均地温最低、冻土层相对较厚的地区，所处的水文地质及工程地质环境极其复杂。由于勘探程度低，深孔钻探的实钻资料较少，缺乏对该区深部岩层的岩石物理力学特性研究。因此，结合地球物理测井技术、取心和实验测试结果对QK-7孔钻遇地层岩石物理力学参数进行分析，并对冻土带异常孔隙水压力极复杂地层孔壁稳定泥浆工艺技术进行总结和探索，以期为羌塘盆地油气资源战略开发深孔钻探的顺利实施提供基础理论支持。

Abstract:

Qiangtang basin is an area with the lowest annual mean ground temperature and a relatively thick frozen soil layer in the Qinghai-Tibet Plateau, the hydrogeology and engineering geological environment are extremely complex. Because of low exploration degree in Qiangtang basin, there are few real drilling data of deep hole drilling, the study on rock physical and mechanical properties of deep rock strata in this area is lack. Therefore, combining with geophysical well-logging technology, coring and tests measuring results, the analysis is made on rock physical and mechanical parameters of the formations in QK-7 borehole drilling process for natural gas hydrate exploration, and the summarization and exploration are carried out for mud technology of borehole wall stability in extremely complex tundra abnormal pore water pressure in order to provide the practical experience for the smooth implementation of deep drilling in the strategic development of oil and gas resources in Qiangtang basin.