摘要
在定向井及水平井钻井过程中,常采用地质导向技术;地质导向的关键在于实时确定地层界面和产状、实现地层模型的实时更新和井眼轨迹的及时调整,从而最大限度地提高油层的钻遇率.利用基于地层模型的测井响应正演曲线与随钻测井曲线进行对比是确定地层界面的有效方法;本文基于伽马射线在地层中的衰减规律,导出了不同地层模型中随钻伽马测井响应快速正演算法,克服了目前难以将蒙特卡罗算法用于实时随钻伽马测井正演的困难.应用实例表明该方法可以有效地辅助实时判定实际地层界面,更好地实现地质导向.
The geosteering technique is usually used in the directional or horizontal well drilling process. The key technology of geosteering is to judge the formation boundary and attitude for updating the strata model and optimizing the well path in real time, in order to maximize the reservoir-encountered rates. It is an effective method to identify the formation boundary by comparing the forward well log response simulated with a strata model with the real LWD data. Based on the attenuation law of gamma-ray （GR） in formation, this paper deduces a fast forward algorithm for LWD GR response in different strata models with the integral method, which overcomes the difficulty that the Monte Carlo algorithm is hard to be used for real-time forward calculation at present. The field application examples demonstrate that this algorithm can assist to identify the real formation boundary effectively and achieve an even better geosteering effect.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第11期3932-3942,共11页
Chinese Journal of Geophysics
基金
国家油气重大专项(2011ZX05009-003)
中国石油大学(华东)自主创新科研项目(11CX06006A)资助
关键词
水平定向井
随钻伽马测井
地层模型
正演方法
地质导向应用
HorizontForwardal and directionalalgorithm, Geosteewells, Gamma logging while drilling, Strata model,ring application examples
