FORMATION MECHANISM OF HIGH-QUALITY RESERVOIRS IN THE UPPER PERMIAN CHANGXING FORMATION IN YUANBA GAS FIELD, NORTHEASTERN SICHUAN BASIN

LI Chang-feng; HOU Ming-cai; ZHANG Xiao-qing; LI Guo-rong

Volume 21 Issue 2

Jun. 2015

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LI Chang-feng, HOU Ming-cai, ZHANG Xiao-qing, et al., 2015. FORMATION MECHANISM OF HIGH-QUALITY RESERVOIRS IN THE UPPER PERMIAN CHANGXING FORMATION IN YUANBA GAS FIELD, NORTHEASTERN SICHUAN BASIN. Journal of Geomechanics, 21 (2): 278-289.

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FORMATION MECHANISM OF HIGH-QUALITY RESERVOIRS IN THE UPPER PERMIAN CHANGXING FORMATION IN YUANBA GAS FIELD, NORTHEASTERN SICHUAN BASIN

1.
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
2.
Exploration & Production Institute of Southwest Petroleum Branch Company, SINOPEC, Chengdu 610051, China
3.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
4.
College of Resources, Chengdu University of Technology, Chengdu 610059, China

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Received: 2014-09-10
Published: 2015-06-01

Abstract

Abstract

The Yuanba gas field located in the northwestern Sichuan Basin contains the original in-place gas volume of more than one hundred billion cubic meters identified in marine strata. The Upper Permian Changxing Formation as the main gas reservoir for the field is characterized by an abundance of H₂S gas, and is typically buried at deep depths where it is subjected to high temperatures and pressures, gas and water distribution systems are intricate and engineer geology conditions are complicated within it. The dolomites of reef and shoal facies in the Changxing Formation have been regarded as high-quality reservoirs, which exhibits high porosity and permeability, high reservoir heterogeneity, considerable gas production capacity. The aim of this study is to improve the understanding of the dolomite origin using the carbon and oxygen isotopes and the high-quality reservoir formation at deep and ultra-deep depths by analyzing strong correlations in reservoir petrography, depositional facies, diagenesis and fracture development system in detail. The research shows that platform-margin reef and shoal facies in the study area are the most favorable facies belts controlling high-quality reservoir formation because reservoir rock types and spatial geometry are generally determined by depositional characteristics. Dolomitization and dissolution is significantly helpful in increasing reservoir porosity. Multi-history fracture system appearing tectonic in originis very constructive to improve reservoir permeability. It is possibly fair to say that the high-quality reservoir formation in the Changxing Formation was determined by synthetic configurations and dynamic interplays between multiple geological processes and factors.
- Changxing Formation,
- favorable depositional faciesblet,
- diagenesis,
- dolomitization,
- high-quality reservoir

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References

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