摘要
总有机碳含量(total organic carbon,TOC)是确定烃源岩质量的最重要参数。为解决传统ΔlogR方法应用于沉积环境较复杂的海相页岩气储层精度低的问题,以桂中坳陷A区B组海相页岩气储层为研究对象,在分析研究区低阻原因的基础上,对测井曲线按照扩径范围进行井径校正,并利用自然伽马能谱测井中Th/K数据,与ΔlogR建立多元拟合关系,提出基于井径校正和自然伽马能谱测井的改进ΔlogR方法。结果表明:声波时差曲线经过校正后,降低了井径扩径带来的测井数据失真的影响,同时结合自然伽马能谱测井,能够适应研究区复杂的地质背景和较强的非均质性,大大提高总有机碳质量分数的预测精度,具有较好的推广性和适用性。该方法可以为桂中坳陷A区B组海相页岩气储层评价提供参考。
Total organic carbon content(TOC)is the most important parameter to determine the quality of source rocks.In order to solve the problem of low accuracy in the application of the traditionalΔlogR method to marine shale gas reservoirs with complex depositional environments,taking the marine shale gas reservoirs of Group B in Area A of Guizhong Depression as the research object,based on the analysis of the causes of low resistance in the study area,the well diameter correction of the logging curve was performed according to the range of expansion,taking the B-group marine shale gas reservoir in the Guizhong Depression A as the study object.The Th/K data from natural gamma energy spectrum logs were also used to establish a multivariate fitting relationship withΔlogR.An improvedΔlogR method based on well diameter correction and natural gamma energy spectrum logs was proposed.The results show that after the correction of the acoustic transit time curve,the influence of the logging data distortion caused by the diameter expansion of the well was reduced.At the same time,combined with natural gamma spectroscopy logging,it can adapt to the complex geological background and strong heterogeneity of the study area,greatly improve the prediction accuracy of the total organic carbon mass fraction,and has good generalization and applicability.This method can provide a reference for the evaluation of marine shale gas reservoirs from Group B in area A of Guizhong Depression.
作者
李梦蕾
张超谟
石文睿
虞成
罗意淳
LI Meng-lei;ZHANG Chao-mo;SHI Wen-rui;YU Cheng;LUO Yi-chun(College of Geophysics and Petroleum Resources,Yangtze University,Wuhan 430100,China;Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education,Yangtze University,Wuhan 430100,China;Sulige Project Management Department,Chuanqing Drilling Engineering Co.,Ltd.,CNPC,Chengdu 610051,China)
出处
《科学技术与工程》
北大核心
2023年第13期5451-5460,共10页
Science Technology and Engineering
关键词
桂中坳陷
海相页岩气
低电阻率
总有机碳含量
自然伽马能谱测井
改进ΔlogR方法
Guizhong Depression
marine shale gas
low resistivity
total organic carbon content
natural gamma spectroscopy logging
improvedΔlogR method
