基于双趋势约束二分法测井环境校正的研究与应用  

Research and application of dichotomous logging environment correction based on dual constraints

作　　者：王丽丽 刘啸虎 苗金鹏 尹照普 朱峰 汪钰婷 WANG Lili;LIU Xiaohu;MIAO Jinpeng;YIN Zhaopu;ZHU Feng;WANG Yuting(Research institute of BGP,Urumqi 830016,China)

机构地区：[1]东方地球物理勘探有限责任公司研究院乌鲁木齐分院,乌鲁木齐830016

出　　处：《物探化探计算技术》2023年第6期803-811,共9页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：中国石油前瞻性基础性技术攻关项目(2022DJ0507);中国石油集团东方地球物理勘探有限责任公司科研项目(03-03-2023)。

摘　　要：准噶尔盆地阜东斜坡区侏罗系石树沟群发育规模河道砂体,具有断裂和砂体共同控藏特征,但由于砂岩和泥岩均受井眼垮塌等因素影响,导致测井曲线严重失真,常规曲线校正方法难以实现砂泥岩的准确回归,直接影响砂体落实及油气检测精度。通过区内综合对比分析,在明确砂岩低阻抗、泥岩高阻抗特征的基础上,首先应用井眼扩径率对密度的影响,实现砂泥岩整体背景趋势校正;其次选择与砂岩对应良好的核磁总孔对砂岩趋势进行控制,保证砂岩、泥岩相对关系合理,并通过叠合密度振幅变化细节,最终实现测井曲线的精细校正。创新形成基于双趋势约束的“二分法”测井环境校正方法,有效提高测井曲线质量,为研究区储层预测、油气检测等提供可靠数据。该方法的应用较好地解决阜东地区多年来河道砂体预测不准的地质难题,并指导后期井位部署工作。Channel sands are developed in the Jurassic in the Fudong slope area of Junggar Basin,characterized by faults and sand bodies jointly controlling reservoirs.However,sandstone and mudstone are affected by factors such as borehole collapse,and the logging curves are seriously distorted.So,the conventional curve correction methods are challenging to realize the accurate regression of sand and mudstone,which directly affect the accuracy of sand body and oil-gas detection.Through comprehensive comparative analysis in the work area,based on clarifying the characteristics of the low impedance of sandstone and high impedance of mudstone,two steps are adopted:Firstly,the effect of borehole expansion rate on density is used to correct the overall background trend of sand and mudstone;secondly,the NMR porosity which corresponding to the sandstone is selected to constrain sandstone trend,in order to ensure the reasonable relative relationship between sand and mudstone.By superimposing the details of density amplitude change,the accurate correction of the logging curve is finally realized.An improved method of dichotomous logging environment correction is formed,effectively improving the quality of logging curves and provides reliable data for reservoir prediction and oil-gas detection in the study area.Compared with the conventional technique,this method can precisely correct the area with poor data quality and significant area collapse without selecting marker layer and standard curve and realize accurate regression of sandstone and mudstone.The application of this method solves the geological problem of inaccurate prediction of channel sand body in the Fudong area for many years and guides the later well location deployment.

关 键 词：井眼垮塌 曲线校正 双趋势约束 环境校正 

分 类 号：P631.4[天文地球—地质矿产勘探]