川西北双鱼石地区下二叠统栖霞组气水分布特征及主控因素

doi:10.12108/yxyqc.20220107

Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (1): 63-72.doi: 10.12108/yxyqc.20220107

• PETROLEUM GEOLOGY • Previous Articles Next Articles

Gas-water distribution characteristics and main controlling factors of Lower Permian Qixia Formation in Shuangyushi area, NW Sichuan Basin

XU Shiyu, LIN Yi, ZENG Yiyang, ZHAO Chunni, HE Kailai, YANG Jing, LI Yang, ZHU Yi

Research Institute of Exploration and Development, PetroChina Southwest Oil & Gas Field Company, Chengdu 610041, China

Received:2021-07-25 Revised:2021-10-18 Online:2022-01-01 Published:2022-01-21

Abstract

Abstract: The Lower Permian Qixia Formation in Shuangyushi area of northwestern Sichuan Basin is one of the most potential exploration fields at present. Aiming at the unclear gas water distribution characteristics and main controlling factors of gas reservoirs of Qixia Formation in this area,the fluid properties and gas water distribution characteristics in this area were systematically clarified through experimental test analysis,drilling and logging data analysis,seismic data interpretation and production dynamic data analysis,and the main controlling factors of gas-water distribution were further discussed. The results show that the natural gas of Qixia Formation in shuangyushi area is typical dry gas,and the produced fluid can be divided into three types:formation water,flow-back fluid and condensate water. The chemical characteristics of formation water show that the gas reservoir has good preservation conditions. The production wells are mainly distributed in the low part of the structure or near the fault close to the low part. The gas reservoir has the characteristics of continuous gas-bearing in the high part of the structure,local water-bearing in the low part of the structure blocked by the fault,and the local gas-water relationship is complex. The main controlling factors of gas-water distribution are structural location and amplitude,local sealing of faults,hydrocarbon generation intensity of source rocks,reservoir physical properties,heterogeneity and paleogeomorphology. The research results can provide theoretical support for guiding the evaluation of favorable exploration zones of Qixia Formation and seeking the replacement field of large-scale reserves.

Key words: formation water, gas-water distribution, controlling factors, Qixia Formation, Shuangyushi area, Sichuan Basin

CLC Number:

TE122

XU Shiyu, LIN Yi, ZENG Yiyang, ZHAO Chunni, HE Kailai, YANG Jing, LI Yang, ZHU Yi. Gas-water distribution characteristics and main controlling factors of Lower Permian Qixia Formation in Shuangyushi area, NW Sichuan Basin[J].Lithologic Reservoirs, 2022, 34(1): 63-72.

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Gas-water distribution characteristics and main controlling factors of Lower Permian Qixia Formation in Shuangyushi area, NW Sichuan Basin

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