Quantitative Gas Washing Evaluation on Reservoirs in TZ83 Well Block in Tarim Basin

Abstract

Abstract:

In Himalayan period, the dry-gas washing to the ancient reservoirs in the Tazhong No.1 slope break is an important reason that leads to the oil and gas fractionation and the formation of secondary gas condensate reservoir. Most of the previous study on the gas washing in Tazhong is qualitative description, but quantitative research is less, which pulls off the further accumulation research. This paper analyzed the regional structure conditions, summed up the oil and gas properties and component characteristics, made the quantitative description of gas washing by carrying out the n-alkanes quantitative measurement and calculating the loss rate of n-alkanes (Q) in the TZ83 well block. The results of the loss rate of n-alkanes show that all reservoirs in the study area had experienced gas washing (range of Q is 12% to 86%), and the intensity of gas washing gradually decrease from the northwest to southeast in the plane and from deap to shallow in the cross section. Furthermore, during the gas washing, the lower carbon number n-alkane dissolved in gas and separated from oil, led to the formation of condensate gas reservoirs with high wax content. It is confirmed that the gas washing of high-maturity dry gas to TZ83 well block along the interchange of Tazhong 82 and the Tazhong No.1 slope break and provides quantitative evidence for the accumulation research.

Key words: Tarim Basin, TZ83 well block, gas washing, loss rate of nalkanes, quantitative evaluation

CLC Number:

TE122

LI Zhuo , JIANG Zhen-xue , YANG Hai-jun , ZHANG Bao-shou , HUANG Yu-yan. Quantitative Gas Washing Evaluation on Reservoirs in TZ83 Well Block in Tarim Basin[J]. Geoscience, 2010, 24(6): 1171-1177.

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