一种考虑密度因素的广义ΔlogR法预测总有机碳含量——以渤中凹陷西南部陆相深层烃源岩为例  

Prediction of total organic carbon content by a generalized ΔlogR method considering density factors:illustrated by the example of deep continental source rocks in the southwestern part of the Bozhong sag

作　　者：王祥 马劲风[1,2] 张新涛 王震亮[1,2] 王飞龙 王浩璠 李琳[1,2] WANG Xiang;MA Jin-feng;ZHANG Xin-tao;WANG Zhen-liang;WANG Fei-long;WANG Hao-fan;LI Lin(National and Local Joint Engineering Research Center of Carbon Capture and Storage Technology,Department of Geology,Northwest University,Shaanxi,Xi’an 710069,China;State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Shaanxi,Xi’an 710069,China;Exploration and Development Research Institute,Tianjin Branch of CNOOC,Tianjin 300452,China)

机构地区：[1]二氧化碳捕集与封存技术国家地方联合工程研究中心,西北大学地质学系,西安710069 [2]大陆动力学国家重点实验室,西北大学地质学系,西安710069 [3]中国海油天津分公司勘探开发研究院,天津300452

出　　处：《地球物理学进展》2020年第4期1471-1480,共10页Progress in Geophysics

基　　金：中海石油(中国)有限公司天津分公司委托课题“渤中凹陷深层成烃成藏机理与规律研究”(CCL2018TJTZDST0579)资助。

摘　　要：烃源岩总有机碳含量(TOC)的预测是烃源岩有机质丰度评价的重要一环.为解决传统ΔlogR方法应用于陆相深层烃源岩误差较大的问题.本文以ΔlogR法为基础,提出了一种考虑密度因素的广义ΔlogR法预测TOC.传统ΔlogR方法是一种基于测井曲线(声波、电阻率等)和成熟度参数(LOM)的预测TOC的方法,可以获得纵向上连续的有机碳分布,并且在国内外多个地区取得了较好的效果.但是研究表明,由于陆相深层烃源岩受到压实作用等影响,传统ΔlogR方法预测的结果不理想.干酪根有机质的密度远低于烃源岩基质密度,将考虑密度因素的广义ΔlogR法预测TOC的方法应用于渤中凹陷西南部东营组和沙河街组烃源岩,对其TOC进行分段预测,并与传统ΔlogR法、敏感测井多元回归方法预测结果进行对比,结果表明,研究区使用该方法的效果要优于其他两种方法.该方法拓展了传统ΔlogR法的适用范围,为烃源岩TOC的预测提供了新的思路和方法.The evaluation of organic matter abundance is an important part of the evaluation of source rocks,and the prediction of total organic carbon content is an important part of it.In order to solve the problem that traditionalΔlogR method to large-scale errors in continental deep source rocks.Based on theΔlogR method,a generalizedΔlogR method considering density factor is proposed to predict TOC in this paper.The traditionalΔlogR method is a method for predicting TOC based on well logs(sonic logging,resistivity logging,etc.)and maturity parameters(LOM),which can obtain continuous organic carbon distribution and achieve better results in multiple domestic and foreign regions.However,studies have shown that the results predicted by the traditionalΔlogR method are not ideal due to the influence of compaction of the deep-seated source rocks and this type of source rocks are rich in highly conductive components.The density of kerogen organic matter is much lower than that of source rock matrix.The method of predicting TOC by the generalizedΔlogR method considering density factor is applied to the source rocks of Dongying formation and Shahejie formation in the southwest of the Bozhong sag,and compared with the traditionalΔlogR method,sensitive logging multiple regression method prediction results.The results show that the effect of using this method in the study area is better than the other two methods.This method expands the scope of application of the traditionalΔlogR method and provides a new idea and a new method for the prediction of hydrocarbon source rocks’TOC.

关 键 词：渤中凹陷 烃源岩 ΔlogR法 东营组 沙河街组 

分 类 号：P631[天文地球—地质矿产勘探]