ENGINEERING GEOLOGICAL CHARACTERISTICS OF TIGHT GAS SANDSTONE RESERVOIRS IN WESTERN SICHUAN BASIN AND STRATEGY OF FORMATION DAM-AGE CONTROL

doi:10.3863/j.issn.1000-2634.1999.01.001

西南石油大学学报(自然科学版) ›› 1999, Vol. 21 ›› Issue (1): 1-5.DOI: 10.3863/j.issn.1000-2634.1999.01.001

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ENGINEERING GEOLOGICAL CHARACTERISTICS OF TIGHT GAS SANDSTONE RESERVOIRS IN WESTERN SICHUAN BASIN AND STRATEGY OF FORMATION DAM-AGE CONTROL

Kang Yili¹ Luo Pingya¹ Yang Yong² Wang Ping²

Southwest Petroleum Inst

Received:1998-07-14 Revised:1900-01-01 Online:1999-02-20 Published:1999-02-20
Contact: Kang Yili

Abstract

Abstract: Formation damage has been recognizes as one of the key factors limiting the efficiency of exploration and development for natural gas in tight sandstones. A comprehensive research on the engineering geological conditions of tight gas sandstone reservoirs in western Sichuan Basin revealed the following characteristics:①existence of multiple pay zones differing markedly in thickness and areal extent;②abnormally high formation pressure and multi-pressure systems;③capillary pressure increasing sharply with increased burial and decreased permeability of the reservoirs;④fractures occurring heterogeneously,with microfractures being the major contributor of reservoir permeability;⑤strong water and alkaline sensitivity related to abundant clays, and⑥reservoir permeability being very sensitive to variations in stress conditions. Analyses indicate that horizontal wells, gas based working fluids, and temporary shielding techniques are suitable for the protection of such tight gas sandstone reservoirs.

Key words: tight sandstone, formation damage control, geological engineering, Sichuan basin

CLC Number:

TE122.2
TE25

Kang Yili Luo Pingya Yang Yong Wang Ping. ENGINEERING GEOLOGICAL CHARACTERISTICS OF TIGHT GAS SANDSTONE RESERVOIRS IN WESTERN SICHUAN BASIN AND STRATEGY OF FORMATION DAM-AGE CONTROL[J]. 西南石油大学学报(自然科学版), 1999, 21(1): 1-5.

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ENGINEERING GEOLOGICAL CHARACTERISTICS OF TIGHT GAS SANDSTONE RESERVOIRS IN WESTERN SICHUAN BASIN AND STRATEGY OF FORMATION DAM-AGE CONTROL

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