柴达木盆地涩北气田疏松砂岩气藏水气体积比及水侵预警

doi:10.7657/XJPG20230107

摘要/Abstract

摘要：

柴达木盆地涩北气田属于弱边水驱动的背斜型浅层疏松砂岩气田，采用衰竭式开采。根据水气体积比，其气藏生产过程可分为4个阶段，即低含水稳产阶段、初期水侵阶段、边水突破阶段和强水侵阶段。依照水气体积比变化，可以准确监测水侵的发生，水侵突破阶段可以作为预判边水大规模水侵的时间窗口，以调整开采方案，延长稳产期；高含水的强水侵阶段，生产周期较长，是带水开采提高采收率的重要阶段。

关键词: 柴达木盆地, 涩北气田, 生物气藏, 疏松砂岩, 边水, 弹性水驱, 水气体积比, 水侵预警

Abstract:

The Sebei gas field in the Qaidam basin is an anticline-type shallow unconsolidated sandstone gas field driven by weak edge water，and is exploited by depletion. According to water-gas ratio (WGR)，the production process in the gas field can be divided into four stages: low water-cut steady production stage，initial water invasion stage，edge water breakthrough stage，and strong water invasion stage. The occurrence of water invasion can be accurately monitored based on WGR. The edge water breakthrough stage can be used as a time window for predicting the large-scale water invasion of edge water，so as to adjust the development plan and extend the steady production period. The strong water invasion stage with high water cut corresponds to a long production period，so it is an important stage for enhanced oil recovery while producing with water.

Key words: Qaidam basin, Sebei gas field, biogenic gas reservoir, unconsolidated sandstone, edge water, elastic water drive, water-gas ratio, early warning of water invasion

中图分类号:

TE355.3

柴小颖, 王燕, 刘俊丰, 陈汾君, 杨会洁, 谈志伟. 柴达木盆地涩北气田疏松砂岩气藏水气体积比及水侵预警[J]. 新疆石油地质, 2023, 44(1): 51-57.

CHAI Xiaoying, WANG Yan, LIU Junfeng, CHEN Fenjun, YANG Huijie, TAN Zhiwei. Water-Gas Ratio and Early Warning of Water Invasion in Unconsolidated Sandstone Gas Reservoirs in Sebei Gas Field，Qaidam Basin[J]. Xinjiang Petroleum Geology, 2023, 44(1): 51-57.

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