【摘要】 致密砂岩储层在钻探过程中获取的地下岩石一般都是非定向岩样,而通过这些非定向岩心研究储层水平主地应力方向是石油勘探开发重要的基础工作之一。致密储层地应力状态、地层岩石的力学性质决定着水力裂缝的起裂形态、延伸方向、高度和宽度,而水力裂缝的几何形态是影响压裂措施增产效果的主要因素之一。文章开展岩心定向综合实验测量方法研究,利用黏滞剩磁法、波速各向异性法,形成了一套致密砂岩非定向岩心室内实验综合测量及解释技术,通过水力压裂微地震地面监测,证实了室内岩心定向技术的可靠性。更多还原

【Abstract】 Core samples which taken from the tight sandstone reservoir are generally non-directional,it is very important to study the horizontal principal stress direction for petroleum exploration and development through the non-directional rocks. As the special geological features,gas wells in tight sandstone reservoirs have lower productivity,these wells need to improve productivity by hydraulic fracturing. Hydraulic fracture morphology includes extension direction,height and width,the geometry of hydraulic fracture was decided by in-situ stress and affected productivity of gas wells. This paper presented a summary of how to measure the in-situ stress direction,the measurement method has been set up including acoustic velocity anisotropy and viscous remanence,the result of laboratory measurement has been verified by hydraulic fracturing and microseismic monitor. The measurement method to in-situ stress would support efficient development of tight sandstone reservoirs.更多还原