中国石油大学学报（自然科学版）2017，Vol.41Issue(4)：54-64,11.DOI:10.3969/j.issn.1673-5005.2017.04.007
基于变系数ΔlogR技术的烃源岩TOC精细评价
TOC evaluation using variable-coefficient ΔlogR model
摘要
Abstract
The source rocks in the First Member of Nantun Formation of Wuerxun sag, Hailaer Basin are characterized by strong organic heterogeneity with large variations in total organic carbon( TOC) values, resulting in the organic abundance of source rocks which cannot be represented by limited and discrete test samples. Source-rock sections can be easily recognized by high natural gamma ray, high interval transit time and medium resistivity logging response, but it is difficult to establish a universal TOC prediction formula, because the key parameters inΔlogR model vary from well to well. Unlike in conventional approaches where ΔlogR is approximated empirically, an new approach that assumesΔlogR as unknow parameters ( k and a) is applied. In the variable-coefficient ΔlogR model,"k" is predicted according to single well, whereas "a" is predicted in the light of zones and facies. This variable-coefficientΔlogR model is applied to 120 wells. Sources rocks in the First Mem-ber of Nantun Formation are divided into three grades according to the relationship between measured TOC and Hydrogen in-dex ( IH ) . TOC limit for poor source rocks, medium source rocks and excellent source rocks are 1. 0% and 2. 0%, thus log-ging-derived TOC is used to classify source rocks. Within the sequence stratigraphic framework, the depth of source rocks of various grades is determined by calculating thickness ratio of various-grade source rocks in system tracts of single well and by using the Kriging interpolation between all the wells. The results show that logging calculated TOC by the variable-coefficientΔlogR model agrees well with the measured values. The TOC predicting error by the variable-coefficientΔlogR model is about 16. 6%, with 19. 9% reduction than the traditional ΔlogR model. For the three rock types, poor source rocks, medium source rocks, and excellent source rocks, their depths are 15-20 m, 10-20 m, and 20-45 m;and their volumes are 0. 46 ×1011m3, 0. 46×1011m3, and 1. 08×1011m3, respectively. These three types account for 14. 7%, 34. 5%, and 50. 8% of total source rocks in volume.关键词
测井/烃源岩/总有机碳/变系数ΔlogR技术/乌尔逊凹陷/海拉尔盆地Key words
well logging/source rocks/total organic carbon ( TOC )/variable-coefficient ΔlogR model/Wuerxun sag/Hailaer Basin分类
能源科技引用本文复制引用
陈海峰,王凤启,王民,于惠宇..基于变系数ΔlogR技术的烃源岩TOC精细评价[J].中国石油大学学报（自然科学版）,2017,41(4):54-64,11.基金项目
国家自然科学基金项目(41402110) （41402110）
中央高校基本科研业务费专项(14CX05017A) （14CX05017A）
