On A ccumulation of Water- Soluble Gas Released from Formation Water Resulted from Tectonic Uplift

Abstract

Abstract: This paper presents the geological factors controlling the natural gas solubility in the formation water, the methods used to calculate the solubility, and the quantity of natural gas released from fomation water due to tectonic uplift. Three cases , Urengoy gas-feld of West Siberian basin , Weiyuan gas feld of Sichuan basin and Kela-2 gas -field of Tarim basin, about water soluble gas being converted into free gas are analyzed. The composition characteristic of high content of methane in free gas reservoir and the main reasons are discussed. The accumulation models of water sduble gas in the three cases are summarized, and four contolling factors are provided.

Key words: tectonic uplif, water-soluble hydrocarbon, gas compos ition, degasification, natural gas reservoir

CLC Number:

TE112.12

WANG Qing, ZHANG Zhi-huan. On A ccumulation of Water- Soluble Gas Released from Formation Water Resulted from Tectonic Uplift[J]. Xinjiang Petroleum Geology, 2005, 26(3): 318-321.

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