莺-琼盆地随钻地层压力监测难点及应对措施  

Difficulties and countermeasures of formation pressure monitoring while drilling in Yingqiong basin

作　　者：胡益涛 陈沛 刘世宁 HU Yitao;CHEN Pei;LIU Shining(Zhanjiang Branch of ChinaFrance Bohai Geoservices Co., Ltd.,Zhanjiang, Guangdong 524057, China;CNOOC(China) Limited (Zhanjiang Branch), Zhanjiang, Guangdong 524057, China)

机构地区：[1]中法渤海地质服务有限公司湛江分公司 [2]中海石油(中国)有限公司湛江分公司

出　　处：《录井工程》2020年第4期41-49,共9页Mud Logging Engineering

摘　　要：莺-琼盆地油气资源丰富,由于盆地内发育区域性的特殊地质构造,异常压力成因多样,异常压力区分布不确定,造成钻井作业实施的难度巨大,异常压力成为该区勘探和开发的“绊脚石”。为了提高该区地层压力预、监测的精确度,采取应对措施如下加强钻前地质认识并探索异常压力的成因及变化情况,优选模型和参数进行压力评价,必要时引入中途VSP测井技术,进行钻头前地层层位及压力精细评价。实施应对措施后,在随钻压力监测实钻作业中取得了良好的效果,随钻压力监测精度、稳定性稳步提高,压力预测与实测吻合率由90%提高至95%以上。Yingqiong basin is rich in oil and gas resources.Due to the development of regional special geologic structures in the basin,the origins of abnormal pressure are diverse and the distribution of abnormal pressure area is uncertain,which makes it difficult to carry out drilling operations.Abnormal pressure has become"a stumbling block"for exploration and development in this area.For improving the accuracy of formation pressure prediction and monitoring in this area,the countermeasures are taken as follows:strengthen predrilling geological understanding and explore the origins and changes of abnormal pressure,optimize the model and parameters for pressure evaluation,introduce midway VSP logging technology if necessary and conduct fine evaluation of formation horizon and pressure in front of drill bit.After implementing the countermeasures,good results have been achieved in the actual drilling operation of pressure monitoring while drilling.The accuracy and stability of pressure monitoring while drilling are improved steadily,and the coincidence rate between predicted pressure and measured pressure is increased from 90%to more than 95%.

关 键 词：莺-琼盆地 随钻 地层压力 监测 超压分布 成因识别 中途VSP测井 

分 类 号：TE132.1[石油与天然气工程—油气勘探]