摘要
锦州N构造馆陶组底部发育的厚层致密砂砾岩被称为底砾岩,底砾岩段是构造范围内的对比标志层,具备横向分布广泛及可钻性较差的特点,因此底砾岩的识别对井场地质及钻井作业具有重要意义。底砾岩段上覆岩性为厚层含砾砂岩,下伏岩性为厚层泥岩,传统方法识别底砾岩的顶界面及底界面精度低,严重影响作业质量。通过分析锦州N构造已钻井的工程及地质资料,进而将扭矩方差分析法、气测钻时作积分析法等录井方法以及电阻率值对比识别法、自然伽马数值法及中子密度交会分析等测井方法综合应用于锦州N构造5口井底砾岩段的识别,底砾岩顶界面及底界面卡取精度较传统做法均有大幅提高,对油田高效开发具有重要意义。
The thick tight glutenite developed at the bottom of Guantao formation in Jinzhou N structure is called basal conglomerate.The basal conglomerate is a marker bed in the tectonic range,which has the characteristics of wide lateral distribution and poor drillability.Therefore,the identification of basal conglomerate is of great significance to well site geology and drilling operation.The overlying lithology of the basal conglomerate section is thick conglomeratic sandstone and the underlying lithology is thick mudstone.The traditional methods for identifying the top and bottom interfaces of basal conglomerate had low accuracy,and seriously affected the working quality.Based on the analysis of engineering and geological data of historical wells in Jinzhou N structure,mud logging methods such as torque variance analysis,analysis of gas logging curve after dealing with the product of drilling time and total hydrocarbon,and well logging methods such as resistivity comparison identification method,natural gamma ray numerical method and neutron density intersection analysis are comprehensively applied to identify basal conglomerate sections of 5 wells in Jinzhou N structure.Compared with the traditional methods,the accuracy of determining the top and bottom interfaces of basal conglomerate has been greatly improved,which is of great significance to the efficient development of oilfields.
作者
董国富
刘广明
崔国宏
李亚男
苑仁国
刘亚东
Dong Guofu;Liu Guangming;Cui Guohong;Li Yanan;Yuan Renguo;Liu Yadong
出处
《录井工程》
2018年第4期32-35,100,共5页
Mud Logging Engineering
关键词
馆陶组
底砾岩
录井
测井
锦州N构造
扭矩方差
钻时
识别
Guantao formation
basal conglomerate
mud logging
well logging
Jinzhou N structure
