摘要
页岩气钻井漏失会极大增加钻井成本,影响页岩气勘探开发的经济效益。如何利用地球物理技术较为准确地预测钻井漏失区,成为页岩气勘探开发中亟待解决的问题。当泥页岩地层发育高角度缝时更易发生井漏,以此为基础提出了一种新的钻井漏失预防思路和方法:以叠前地震数据为基础,基于方位各向异性技术预测高角度缝的分布特征,并将其作为预防井漏的依据。选取川东南某地区龙马溪组的页岩气勘探区作为应用实例,通过钻井漏失点与预测高角度缝的对比分析,证实了新方法的有效性。
Shale gas drilling leakage will greatly increase the cost of drilling,and affect the economic benefits of shale gas exploration and development. How to predict the drilling leakage area with geophysical technology accurately becomes an urgent problem to be solved. The well tends to leak when drilling through the shale formation in which the high angle fraction developed. On this account,a new method of drilling leakage prevention is put forward: Based on the pre-stack seismic data,the azimuthal anisotropy technique is used to predict the distribution of high angle fractures,which is devoted to the drilling leakage prevention. The shale gas exploration area of Longmaxi Formation in the area of Southeast Sichuan is taken as an example. By comparing the drilling leakage data with the result of fracture prediction,the validity of the new method is proved.
出处
《科学技术与工程》
北大核心
2017年第31期53-59,共7页
Science Technology and Engineering
基金
中石化科技部项目"川东地区海相地层异常压力形成机理与分布预测"(G5800-15-ZS-KJB004)和中石化科技部基础前瞻项目"碳酸盐岩层系异常地层压力预测方法研究"(G5800-16-ZS-KJB043)资助
关键词
方位各向异性
裂缝预测
钻井漏失
泥页岩
页岩气
azimuthal anisotropy
fracture prediction
drilling leakage
mud shale
shale gas
