| 随钻伽马测井快速正演算法及地质导向应用 |
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| 引用本文： | 邵才瑞,曹先军,陈国兴,张福明,姬嘉琦,唐建红.随钻伽马测井快速正演算法及地质导向应用[J].地球物理学报,2013,56(11):3932-3942. |
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| 作者姓名： | 邵才瑞 曹先军 陈国兴 张福明 姬嘉琦 唐建红 |
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| 作者单位： | 1. 中国石油大学(华东)地球科学与技术学院, 青岛 266580;2. 中石油西部钻探测井公司, 克拉玛依 834000 |
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| 基金项目： | 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 |
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| 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.
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| 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 |
| 收稿时间： | 2012-11-17 |
A fast forward algorithm for LWD gamma-ray response and its geosteering application |
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| SHAO Cai-Rui,CAO Xian-Jun,CHEN Guo-Xing,ZHANG Fu-Ming,JI Jia-Qi,TANG Jian-Hong.A fast forward algorithm for LWD gamma-ray response and its geosteering application[J].Chinese Journal of Geophysics,2013,56(11):3932-3942. |
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| Authors: | SHAO Cai-Rui CAO Xian-Jun CHEN Guo-Xing ZHANG Fu-Ming JI Jia-Qi TANG Jian-Hong |
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| Institution: | 1. School of Geosciences of China University of Petroleum, Qingdao 266580, China;2. CNPC West Drilling and Logging Company, Karamay 834000, China |
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| Abstract: | 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. |
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| Keywords: | Horizontal and directional wells Gamma logging while drilling Strata model Forward algorithm Geosteering application examples |
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