结合地层元素测井和密度测井提高孔隙度评价精度

第42卷 第2期

2018年4月

测 井 技 术WEL L LOGGING T EC H NOLOGY Vol .42 No .2Apr 2018

基金项目:国家油气重大专项(2016ZX 05046002‐003);中国石油天然气集团公司科学研究与技术开发项目(2016A ‐3601)第一作者:袁超,男,1987年生,博士研究生,从事放射性测井方法研究、测井资料处理与应用。E ‐mail :y uanc @p etrochina .com .cn 文章编号:1004‐1338(2018)02‐0145‐05结合地层元素测井和密度测井提高孔隙度

评价精度

袁超1,马萌2,周灿灿1,冯周1,施宇峰3

(1.中国石油勘探开发研究院,北京100083;2.中国石油技术开发公司,北京100028;

3.中国石油集团测井有限公司塔里木分公司,新疆库尔勒841001)

摘要:岩性较复杂的储层中,由于矿物组分及含量的复杂性,利用常规解释方法不能准确计算地层孔隙度。为此,结合地层元素测井和地层密度测井提高孔隙度计算精度。采用基于多目标规划的最优化新方法,将地层元素测井直接测量的元素含量反演得到高精度的矿物含量。根据地层矿物含量准确计算骨架密度值,结合密度测井资料,获取精确的地层孔隙度测井评价结果。将该方法应用到实际测井资料中,并与岩心分析结果对比验证计算结果的准确性。该方法的计算结果与岩心分析结果的相关系数,高于仅利用密度测井以及中子密度测井交会等常规解释方法,证明了该方法提高地层孔隙度评价精度的实用性。

关键词:地层元素测井;密度测井;孔隙度评价;精度提高

中图分类号:P 631.84 文献标识码:A

Doi:10.16489/j .issn .1004‐1338.2018.02.004

AnImprovedMethodtoEvaluatePorositywiththeCombinationof

FormationElementalLoggingandDensityLoggingYUAN Chao 1,M A Meng 2,ZHOU Cancan 1,FENG Zhou 1,SHI Yufeng 3(1.Research Institute of Petroleum Exploration and Development ,PetroChina ,Beijing 100083,China ;

2.China Petroleum T echnology &Development Corporation ,Beijing 100028,China ;

3.T arim Branch ,China Petroleum Logging CO .L T D .,Korla ,Xinjiang 841001,China )

Abstract:T he conventional logging evaluation

methods can not accurately calculate porosity in the reservoirs

w hich are characterized by complex mineral components and contents .In order to solve this problem ,formation element logging is combined with density logging to improve the evaluation accuracy of porosity .A new optimization method based on multi ‐objective p rogramming (M OP )is used to obtain high ‐p recision mineral contents by inversing the element contents measured directly from formation element logging .Based on that ,the matrix density can be calculated

,and the precise porosity can be obtained with the combination of density logging data .Comparing the results of this new method with the core analysis results to validate the accuracy of this method .It is found that the correlation coefficient between them is higher than the conventional methods such as density logging method and the neutron ‐density crossplot method ,w hich proves that this method can improve the accuracy of porosity evaluation .Keywords:formation elemental logging ;density logging ;p orosity evaluation ;accuracy improve ‐ment 万方数据

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