化学计量学方法在元素录井地质导向中的研究与应用  

Application of chemometrics method on geosteering with element logging

作　　者：马自安 谢文敏[1] 李国宏 谷兆兴 陈海涌 秦小虎 MA Zian;XIE Wenmin;LI Guohong;GU Zhaoxing;CHEN Haiyong;QIN Xiaohu(Engineering Technology Department of PetroChina Changqing Oilfield Company,Xi′an,Shaanxi 710000,China;No.11 Oil Production Plant of PetroChina Changqing Oilfield Company,Qingyang,Gansu 745000,China)

机构地区：[1]中国石油长庆油田公司工程技术部 [2]中国石油长庆油田公司第十一采油厂

出　　处：《录井工程》2024年第2期91-96,共6页Mud Logging Engineering

摘　　要：针对通过元素录井对岩性进行识别过程中存在的解释方法相对单一、精准度较差,尤其在地质导向中易出错等问题,利用化学计量学方法建立了一套元素录井水平井导向方法,通过计算机,利用数学方法对水平井目标层、上部围岩层、下部围岩层之间的不同岩性进行差异特征分析,从复杂的元素测量数据出发,利用主成分分析、夹角余弦相似度分析等算法进行分析并形成可视化二维图板,根据分析结果给出轨迹调整方案,指导钻头在目标层中水平钻进。该方法在鄂尔多斯盆地多口重点水平井进行了实际应用,均取得了较好的应用效果,提高了水平井油层钻遇率,也为水平井整体研究提供了十分有用的信息。In the process of lithology identification,element logging interpretation is relatively simple and less accurate,especially in geosteering.A set of element logging horizontal well geosteering method is established by using chemometrics method,and the difference characteristics of different lithology of target layer,upper surrounding rock layer and lower surrounding rock layer of horizontal well are analyzed by computer and mathematical methods.Starting from the complex element measurement data,the principal component analysis and included angle cosine similarity analysis are used to analyze and form a visual two⁃dimensional drawing board.The trajectory adjustment scheme is given to guide the bit to drill horizontally in the target layer.This method has been applied in many key horizontal wells in Ordos Basin,and good application results have been obtained,which improves the reservoir drilling rate of horizontal wells and provides useful information for the overall study of horizontal wells.

关 键 词：水平井 元素录井 化学计量学 模式识别 主成分分析 夹角余弦相似度分析 鄂尔多斯盆地 

分 类 号：TE132.1[石油与天然气工程—油气勘探]