RESERVOIR CHARACTERISTICS AND GAS RESERVE ASSESSMENT OF HIGH PRODUCTION-WATER LAYERS AT X1 WELL IN CENTRAL SICHUAN

Lu Zhenyuan; Wang Honghui; Yang ShengZhong; Wang Yikai

doi:10.11743/ogg19940404

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RESERVOIR CHARACTERISTICS AND GAS RESERVE ASSESSMENT OF HIGH PRODUCTION-WATER LAYERS AT X1 WELL IN CENTRAL SICHUAN
Vol. 15, Issue 4, Pages: 293-298(1994)
Online First：25 December 1994，

Published：1994
DOI： 10.11743/ogg19940404
稿件说明：

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DOI：

Lu Zhenyuan, Wang Honghui, Yang ShengZhong, et al. RESERVOIR CHARACTERISTICS AND GAS RESERVE ASSESSMENT OF HIGH PRODUCTION-WATER LAYERS AT X1 WELL IN CENTRAL SICHUAN[J]. 1994, 15(4): 293-298. DOI： 10.11743/ogg19940404.

摘要

川中X1井经过近30年的卤水开采

已由一口特大水井变为具有工业开采价值的气水同产井.X1井地下裂缝系统具有独立封闭性

产出大量气水的动力主要是水体上方天然气弹性膨胀和岩石孔隙缩小.根据生产动态资料

利用物质平衡原理计算出该系统中天然气储量可观

今后生产中天然气产量增长将明显大于地层卤水.在四川盆地上三叠统致密砂岩裂缝性储层中

同样可以通过水井排水找到钻井未曾发现的天然气.

Abstract

X1 well

a great brine well in Central Sichuan

has become a commercial brine-gas well through about 30 years brine deviopment.Based on reservoir petrophysics and regional correlation

it is thought that the fracture system of the well is an independent sealing system with well developed subsurface fractures and has enriched abundant natural gas. The driving force of the well’s water and gas production is primarily resulted by elastic expansion of the gas on the water body and pore space contraction in the system. Depanding upon the production data and meterial balance theory

it has been calculated that there would be a great deal of gas in the system. The increase in gas production of the well would be more than that of water in future. It is proposed that"finding gas by water withdrawal"can be applied to the fractured reservoir in the compacted sandstone of the UPPer Triassic in Sichuan Basin.