地球物理方法在渤中34油田井漏预测中的应用  

Application of geophysical methods in lost circulation prediction of Bozhong 34 Oilfield

作　　者：张向前 谭忠健 邓津辉 曹军 苑仁国 袁亚东 赵才顺 ZHANG Xiangqian;TAN Zhongjian;DENG Jinhui;CAO Jun;YUAN Renguo;YUAN Yadong;ZHAO Caishun(CNOOC Ener Tech-Drilling & Production Co.,Tianjin 300459,China;CNOOC(China)Tianjin Branch,Tianjin 300452,China)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司 [2]中海石油(中国)有限公司天津分公司

出　　处：《录井工程》2021年第3期141-146,共6页Mud Logging Engineering

基　　金：中海石油(中国)有限公司天津分公司科研项目“渤海典型区块第三系裂缝预测技术及在钻井工程中的应用”(编号:CCL2020TJX0NST1300)部分研究成果。

摘　　要：渤中34油田区域内构造活动强烈、断裂发育,裂缝性井漏频发。研究发现,中小尺度断层是造成井漏的主要因素。受地震资料分辨率的影响,应用常规地震剖面识别中小尺度断层难度较大,进而导致裂缝性井漏风险预测效果不佳,为提高预测评估井漏风险的精度,急需探索一种有效识别中小尺度断层的地球物理方法。通过对渤中34油田已钻井井漏特征分析,基于常规地震剖面、方差属性、蚂蚁体属性等地球物理方法识别渤中34油田中小尺度断层,建立井漏风险等级判识决策树,并根据井漏风险等级的不同采取了相应的钻井应对措施。实际应用表明,该方法在渤中34油田裂缝性井漏预测中具有良好的应用效果,能够实现优快钻井与漏失防控的有效耦合,具有现场可操作性强、识别准确度高的优点,为渤中34油田开发钻井工程预防井漏工作提供了重要技术支持。It is found that meso-micro scale faults are the main factors of lost circulation in Bozhong 34 Oilfield where strong tectonic activity,well-developed faults and frequent fractured lost circulation exist.Affected by seismic data resolution,it is difficult to identify meso-micro scale faults using conventional seismic profiles,which leads to poor prediction of fractured lost circulation risk.To improve the accuracy of lost circulation risk prediction and assessment,it is urgent to explore a geophysical method to effectively identify meso-micro scale faults.The lost circulation risk grade decision tree is established through analysis of the lost circulation characteristics of wells drilled in Bozhong 34 Oilfield and identification of meso-micro scale faults by geophysical methods of conventional seismic profile,variance attribute,and ant body attribute,and corresponding drilling countermeasures are taken according to different risk levels of lost circulation.This method shows good effects in application to fractured lost circulation prediction in Bozhong 34 oilfield.It realizes effective coupling of excellent-fast drilling and lost circulation prevention and control,has strong field feasibility and high accuracy in identification,and provides important technical support for the prevention of lost circulation in the development and drilling engineering of Bozhong 34 Oilfield.

关 键 词：渤海油田 方差体技术 蚂蚁追踪技术 裂缝性井漏 

分 类 号：TE132.1[石油与天然气工程—油气勘探]