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Prediction of geomechanical sweet spots in a tight gas sandstone reservoir; a case study of Lower Permian strata in the southern Qinshui Basin, China

Zhao Difei, Guo Yinghai, Yin Shuai, Ren Chengyao and Wang Yujie
Prediction of geomechanical sweet spots in a tight gas sandstone reservoir; a case study of Lower Permian strata in the southern Qinshui Basin, China
Interpretation (Tulsa) (February 2019) 7 (1): T207-T219

Abstract

Using the tight sandstone of the lower Permian Shanxi Formation in the southern Qinshui Basin as an example, we have developed the concept of "geomechanical sweet spots" in a strongly deformed strike-slip fault zone. The evaluation elements for geomechanical sweet spots include current tectonics, paleotectonics, fractures, and rock brittleness. The high-angle basement-surface strike-slip faults that developed in the study area control the formation and development of the descending plane (upper plate) positive traction folds and the ascending plane (lower plate) isopach folds. The current tectonics and the paleotectonics in the mid-Himalayan tectonic period have a certain adjustment effect on the distribution of natural gas. We predicted the fracture development area of the target layer in the main episode of the Himalayan period based on the 3D finite-element method. The regions with a higher fracture development degree are mainly distributed in the Sitou-Houchengyao strike-slip fault zone and the northwestern and eastern parts of the study area. We also divide the brittleness index of sand group II into four grades. Based on a single-factor evaluation of the current tectonics, paleotectonics, fractures, and rock brittleness, we established a standard parameter system for evaluating the geomechanical sweet spots of tight gas sandstone reservoirs.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 7
Serial Issue: 1
Title: Prediction of geomechanical sweet spots in a tight gas sandstone reservoir; a case study of Lower Permian strata in the southern Qinshui Basin, China
Affiliation: China University of Mining and Technology, School of Resources and Geosciences, Xuzhou, China
Pages: T207-T219
Published: 201902
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 36
Accession Number: 2019-034005
Categories: Applied geophysicsStructural geologyEconomic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Technical papers
Illustration Description: illus. incl. block diag., sects., strat. col., 4 tables, geol. sketch maps
N35°00'00" - N41°00'00", E110°30'00" - E114°30'00"
Secondary Affiliation: Shandong University of Science and Technology, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 2019
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