高阻地层HDIL阵列感应影响因素分析与校正方法  

Analysis of influence factors and method of correction in high resistivity formation by a high definition induction log

作　　者：王嵩然 李潮流[1] 刘英明[1] 王磊[2] 胡法龙[1] WANG Songran;LI Chaoliu;LIU Yingming;WANG Lei;HU Falong(Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;School of Geosciences,China University of Petroleum-East China,Qingdao 266580,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油大学(华东)地球科学与技术学院,青岛266580

出　　处：《石油科学通报》2024年第1期50-61,共12页Petroleum Science Bulletin

基　　金：中国石油天然气股份有限公司科技项目(2023DQ0419);中国石油天然气有限公司“十四五”前瞻性战略性技术攻关项目(2021DJ3804)联合资助。

摘　　要：近年来,四川盆地川中深层灯影组和龙王庙组天然气勘探中越来越多地使用油基泥浆,使得裸眼井电阻率测井只能选择阵列感应仪器。该地区目的层致密碳酸盐岩普遍表现为中高电阻率,典型气层的电阻率一般在500Ω·m以上甚至高达2000Ω·m,使得测量电导率的感应测井仪器接收的信号弱,叠加深层高温等因素的影响,采集的信号常出现负值,软件聚焦处理结果常出现平头现象,不能用于储层识别和气层评价。采用有限元模拟算法,分析泥浆电阻率、侵入半径及原状地层电阻率等单因素对阵列感应测井响应的影响规律,明确了各环境因素对感应测量信号的影响规律。结果表明,地层与泥浆电阻率对比度对测量信号有明显影响,当对比度接近于1时,各子阵列的误差较小,而侵入深度是另一个重要影响因素。总体上,较长源距的子阵列受各种因素的影响相对较小。针对实际资料的特点,提出一种基于Archie公式的原始电导率信号约束校正方法,对约束校正后的数据再开展软件聚焦,其结果得到明显改善。In recent years,more and more oil-based mud is being used in middle to deep natural gas exploration of the Dengying and Longwangmiao formations in Sichuan basin.So only array induction instruments can be selected for bare hole resistivity logging.The dense carbonate rock commonly manifests as medium to high resistivity in the target layer in the region.The resistivity of typical gas layers is generally above 500Ω·m and even up to 2000Ω·m.The induction logging instruments measure the weak conductivity received signal and as well the influence of factors such as depth and high temperatures.So,the collected signal often shows negative values and software focused processing results often exhibit algorithm overlaps and flattens out.These cannot be used for reservoir identification and gas reservoir evaluation.We analyzed the influence of single factors such as mud resistivity,invasion radius and virgin zone resistivity on the array induction logging response and clearly defined the influence of various environmental factors on induction measurement signals with a finite element simulation algorithm. Theresults indicate that the contrast between formation and mud resistivity has a significant impact on the measurement signal whenthe contrast is close to 1, the error of each sub array is small and the depth of invasion is another important influencing factor.Overall, sub arrays with longer source distances are relatively less affected by various factors. Based on the characteristics ofactual data, we propose a constrained correction method for raw conductivity signals based on the Archie formula which providesa software focus on the data after constraint correction and the results have been significantly improved.

关 键 词：感应测井 阵列感应 碳酸盐岩 油基钻井液 软件聚焦 

分 类 号：TE151[石油与天然气工程—油气勘探]