随钻自然伽马测井资料环境影响自动校正  

Auto-correction Method Of Environmental Effect On Gamma Logging Data of Logging While Drilling

作　　者：徐波[1] 汪中浩[1] 黎泽刚[1] 向子涛[1] 

机构地区：[1]油气资源与勘探技术教育部重点实验室(长江大学),湖北荆州434023

出　　处：《石油天然气学报》2009年第5期82-85,共4页Journal of Oil and Gas Technology

基　　金：中国石油天然气集团公司石油科技中青年创新基金项目(05E7047)

摘　　要：随钻自然伽马测井在随钻测井中占有重要地位,它能用于划分储层以及评价水平井储层钻遇率。随钻自然伽马测井主要受井眼大小、泥浆性能等影响,针对随钻自然伽马测井所面临的各种不同环境影响因素,对相应的校正图版进行离散采样读值,采用回归分析法拟合读值点数据得出校正公式,并编写出相应的校正程序,以标准化公式(模型)代替校正图版,实现随钻自然伽马测井资料的环境影响自动校正,通过对实测资料的处理,得到校正后的随钻伽马测井曲线更接近校正后的电测伽马曲线。Gamma logging while drilling played an important role in logging while drilling.Because it can be used for reservoir classification and evaluation of drilling ratio of reservoir in horizontal wells.Gamma logging while drilling was mainly affected by such environmental factors as size of the borehole and mud property etc.According to different environmental effects,auto-correction described in this paper was first used to read out values by discrete sampling from corresponding correction charts.Regression analysis was used to fit the reading point data so as to find out the correction formula (models) and write a corresponding correction program.A standard formula (model) is used to replace the correction chartboard for automatic environment correction of logging data while drilling gamma well logging.The results are close to the corrected wire line gamma data from logging while drilling.

关 键 词：随钻自然伽马测井 环境影响 回归拟合 自动校正 

分 类 号：P631.84[天文地球—地质矿产勘探]