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A logging-curve separation scale overlay method for total-organic-carbon estimation in organic-rich shale reservoirs

Xu Jingling, Yangyang Li, Zhang Baoying, Xu Lei and Qin Yuxing
A logging-curve separation scale overlay method for total-organic-carbon estimation in organic-rich shale reservoirs
Interpretation (Tulsa) (May 2017) 5 (3): T373-T384

Abstract

Quantitative estimation of total-organic-carbon (TOC) content using well logs is very important for shale-gas reservoir evaluation, especially when core data are limited. Even though many techniques have been developed to calculate TOC from well logs, they all have their limitations and accurate assessment of TOC in organic-rich tight shales is still challenging. We have used an improved log-overlay method for evaluating TOC content in organic-rich tight shale reservoirs by overlying the properly scaled gamma-ray, sonic transit time, and bulk density curves on top of the compensated neutron log (CNL) curve based on the same concept to the original Delta logR technique. These logging curves are overlapped with the CNL in nonsource intervals, and they are separated in organic-rich shale reservoirs. The separation magnitude increases along with the increase in TOC content of the shale, and this relationship is transformed to calculate TOC. This method was tested and verified by doing a case study using well-log data from the Jiaoshiba tight shale-gas play in the Sichuan Basin. The results illustrated that the new TOC evaluation method is more practical and effective compared with existing TOC evaluation methods.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 5
Serial Issue: 3
Title: A logging-curve separation scale overlay method for total-organic-carbon estimation in organic-rich shale reservoirs
Affiliation: China University of Geosciences, School of Geophysics and Information Technology, China
Pages: T373-T384
Published: 201705
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
Accession Number: 2017-085808
Categories: Economic geology, geology of energy sourcesSedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Secondary Affiliation: C&C Reservoirs, USA, United StatesWireline Logging Company, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201745
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