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Geomechanical characterization of a caprock-reservoir system in the northern Appalachian Basin; estimating spatial variation of in situ stress magnitude and orientation

Samin Raziperchikolaee, Mark Kelley and Neeraj Gupta
Geomechanical characterization of a caprock-reservoir system in the northern Appalachian Basin; estimating spatial variation of in situ stress magnitude and orientation
Interpretation (Tulsa) (August 2018) 6 (3): T759-T781

Abstract

Assessing the mechanical integrity of the caprock-reservoir system is necessary to evaluate the practical storage capacity for geologic CO2 storage. We used a combination of well-log and experimental data to estimate the statistical distribution (mean and variance) of rock mechanical properties of Cambrian-Ordovician strata within the Northern Appalachian region of Ohio and studied their heterogeneity throughout the study area. Empirical correlations between static-dynamic moduli of carbonate and sandstone formations of the Northern Appalachian Basin were developed. The state of stress (the orientation and magnitude of the maximum horizontal stress) for caprock and reservoir formations in the Cambrian-Ordovician sequence was determined at multiple well locations to understand the regional variability of these properties throughout the study area. The maximum horizontal stress (SHmax) azimuth was estimated from image logs for six wells and S-wave anisotropy data for five wells. The SHmax magnitude was estimated by analytical and numerical modeling of stresses around the wellbore calibrated to the occurrence of wellbore breakouts and drilling-induced fractures in three wells as a function of depth. The results of assessing the SHmax magnitude and stress regime in the caprock and reservoirs in the Cambrian-Ordovician sequence using rock mechanical data acquired in this study, well-log data, and drilling data indicate that both parameters vary throughout the study area. In this work, we determined how integrating different types of data from multiple wells allowed us to estimate mechanical properties and characterize the spatial variability (laterally and vertically) of in situ stress for Cambrian-Ordovician caprock and reservoirs throughout the study area. A combination of different methods - numerical, analytical, and stress polygon - is used to estimate the in situ stress magnitude, especially SHmax, regionally on a formation-by-formation basis. The results of this work can be used to improve our understanding the complex nature of stress in the Northern Appalachian Basin.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 6
Serial Issue: 3
Title: Geomechanical characterization of a caprock-reservoir system in the northern Appalachian Basin; estimating spatial variation of in situ stress magnitude and orientation
Affiliation: Battelle Memorial Institute, Columbus, OH, United States
Pages: T759-T781
Published: 201808
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 33
Accession Number: 2019-007397
Categories: Engineering geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 10 tables, geol. sketch maps
N38°30'00" - N42°00'00", W84°00'30" - W80°00'30"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 2019
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