烃源岩TOC计算模型——以鄂尔多斯盆地太原组—山西组为例  

TOC calculation model of source rocks:Case study from Taiyuan-Shanxi formations in Ordos Basin

作　　者：刘瑞 郭少斌[1] 王继远 LIU Rui;GUO Shao-bin;WANG Ji-yuan(China University of Geosciences(Beijing),Beijing 100083,China)

机构地区：[1]中国地质大学(北京),北京100083

出　　处：《天然气地球科学》2020年第11期1628-1636,共9页Natural Gas Geoscience

基　　金：国家科技重大专项“不同类型页岩气生成机理及富集规律研究”(编号:2016ZX05034-001)资助。

摘　　要：多年来,国内外学者不断致力于常规与非常规油气资源烃源岩的评价与研究,烃源岩评价离不开有机质的类型、丰度、成熟度和厚度的研究。对于有机质丰度的研究关键参数是总有机碳含量(TOC)的计算。利用测井资料可以先定性后定量评价烃源岩,富含有机质的烃源岩,在常规测井曲线上表现为:高放射性强度、低补偿密度(DEN)、高声波时差(AC)、高补偿中子(CNL)、高电阻率(Rt)等特征。研究综合了鄂尔多斯盆地二叠系太原组—山西组烃源岩自然伽马能谱测井测量的钍(Th)、铀(U)和AC、Rt曲线,提出以Th/U结合△Log R模型为基础,根据多元回归研究方法确定TOC的计算模型。利用该模型对Y88井太原组—山西组的TOC进行了计算,并对其计算结果和岩心分析进行了对比,结果显示绝对误差大部分低于0.5。将该模型推广应用到其他井数据中,处理结果在误差允许的范围内,该模型具有较强的适用性和可靠性。Over the years,domestic and foreign scholars have been committed to the evaluation and research of conventional and unconventional oil and gas resource source rocks.The evaluation of source rocks is inseparable from the type,abundance,maturity and thickness of organic matter.The key parameter for the study of organic matter abundance is the calculation of Total Organic Carbon(TOC).Using logging data can first qualitatively and then quantitatively evaluate source rocks.The source rock rich in organic matter is shown on the conventional logging curves as:high radioactivity,low compensation density(DEN),high acoustic time(AC),high compensation neutron(CNL),high resistivity(Rt),etc.This study integrated the Thorium(Th),Uranium(U)measured by natural gamma spectroscopy logging,AC and Rt curves of Permian Taiyuan-Shanxi formations source rocks in Ordos Basin of China.Based on Th/U combined with△Log R model,the TOC calculation model was determined according to the multiple regression research method.The model was used to calculate the TOC of the Taiyuan-Shanxi formations in Well Y88,and the calculation results were compared with the core analysis.It was found that the absolute error was mostly less than 0.5.The model can be extended and applied to other wells,and the processing results are within the allowable error range.The model has a strong applicability and reliability.

关 键 词：烃源岩 TOC 计算方法 鄂尔多斯盆地 

分 类 号：TE122.113[石油与天然气工程—油气勘探]