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Energy distribution of weak deformed rock mass and its influence on gas well productivity

Yin Shuai, Wang Yi, Zhao Jingzhou, Wang Yan, Wu Weitao and Yang Tebo
Energy distribution of weak deformed rock mass and its influence on gas well productivity
Interpretation (Tulsa) (May 2019) 7 (2): T423-T435

Abstract

Microfractures represent an important rupture type, but current studies on the construction of microscale rupture parameters and their impacts on oil and gas production capacity are relatively weak. Therefore, we constructed the strain energy density (U) based on 3D finite-element method (FEM) for the tight sandstone reservoir of the Permian He8 segment in the western region of the Sulige gas field, Ordos Basin. It indicated that the U values of the major production layers are mainly distributed between 0.12 and 0.29 J . m (super -3) . High-U-value regions (U > or = 0.23 J . m (super -3) ) are mainly distributed in local areas of the western, central, and eastern regions. The U values are small in the northwestern part of the study area and are usually less than 0.20 J . m (super -3) . There is a very good exponential correlation between the U values and gas well productivity (the main controlling factor for the production capacity of the He8 tight sandstone is the gas content, and fracturing, as an engineering factor affecting capacity, has not been taken into account). The distribution of the strain energy densities also matches the low-amplitude tectonic zone well. We have developed the criterion for the discrimination of gas well productivity using the strain energy density. According to this criterion, the conformity rates of type I, type II, and type III wells are 92.3%, 73.0%, and 83.3%, respectively. The areas with U values greater than 0.21 J . m (super -3) , especially for areas with U values exceeding 0.23 J . m (super -3) , which should serve as the core exploration targets. The research results can effectively guide tight gas sandstone exploration in low-amplitude tectonic zones and reduce the risk of drilling.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 7
Serial Issue: 2
Title: Energy distribution of weak deformed rock mass and its influence on gas well productivity
Affiliation: Xi'an Shiyou University, School of Earth Science and Engineering, Xi'an, China
Pages: T423-T435
Published: 201905
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 66
Accession Number: 2019-036103
Categories: Engineering geologyEconomic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Technical papers
Illustration Description: illus. incl. block diags., strat. cols., 3 tables, sketch maps
N37°00'00" - N40°00'00", E108°00'00" - E111°00'00"
Secondary Affiliation: PetroChina, 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: 201909
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