关键词: 碳酸盐岩气藏, 储量接替, 低效储量, 分布特征, 可动用性分析, 靖边气田

Abstract:

The Jingbian gas field is a carbonate weathering crust gas reservoir in the middle development stage. A core issue that the Jingbian gas field encounters is to maintain the stable production. The low-quality reserves are of importance for future reserve succession in Jingbian gas field. According to the distribution characteristics, the low-quality reserves in Jingbian gas field were divided into three types, i.e., the vertically stacked, laterally connected and separately distributed reserves of low- and high- quality. Of these, the separately distributed reserves of low quality were found in a small scale, whereas those vertically stacked and laterally connected reserves of low quality were considered to be the major types for reserve succession. Accordingly, a numerical simulation method was employed to evaluate and analyze the recoverability of the vertically stacked and laterally connected low-quality reserves. Results indicated that the permeability, well distribution pattern (well spacing) and gas-well production allocation were the most important factors that influenced the recovery rate of low-quality reserves.

Key words: carbonate gas reservoir, reserve replacement, low-quality reserves, distribution characteristics, reserves recoverability analysis, Jingbian gas field