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research-article

Determination of Total Organic Carbon Content in Shale Formations with Regression Analysis

[+] Author and Article Information
Jianguo Wang

School of Petroleum Engineering, China University of Petroleum (Beijing), Changping, China, 102249Petroleum Systems Engineering, Faculty of Engineering and Applied Science, University of Regina, Regina, Saskatchewan, Canada S4S 0A2
wjglww@hotmail.com

Daihong Gu

School of Petroleum Engineering, China University of Petroleum (Beijing), Changping, China, 102249
gudaihong@cup.edu.cn

Wei Guo

National Energy Shale Gas Research Development (Experimental) Centre, PetroChina, Langfang, Hebei, China, 065007
pkuguowei69@petrochina.com.cn

Haijie Zhang

Chongqing Shale Gas Exploration and Development Company Limited, PetroChina, Chongqing, China, 401121
zhang_hj@petrochina.com.cn

Daoyong Yang

Petroleum Systems Engineering, Faculty of Engineering and Applied Science, University of Regina, Regina, Saskatchewan, Canada S4S 0A2
tony.yang@uregina.ca

1Corresponding author.

ASME doi:10.1115/1.4040755 History: Received April 25, 2018; Revised June 12, 2018

Abstract

By correcting both the positive and negative ?logR separation resulting from the resistivity in organic-deficient shales, the traditional ?logR correlation is modified, validated, and applied to determine the total organic carbon (TOC) content in shale formations. The TOC content is determined once the Fisher distribution, which represents the significance of each model, and Student's t-distribution, which denotes the significance of every variable in the models, have achieved values equal to or higher than their respective threshold values at a confidence level of 95%. Using a total of 45 sets of logging measurements, the newly proposed correlation is found to be able to reproduce the measured TOC values with a root mean-squared absolute difference (RMSAD) of 0.30 wt% and root mean-squared relative difference (RMSRD) of 23.8%, respectively. Uranium concentration other than interval transit time and resistivity is found to be the key for determining the TOC content in organic-richness shale without other radioactive minerals. By combining the DGR reading, the traditional ?logR technique has now been improved and extended for the negative ?logR separation resulting from the resistivity in organic-deficient shale higher than that in organic-rich shale.

Copyright (c) 2018 by ASME
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