致密砂岩气藏低采收率成因

doi:10.7657/XJPG20250212

摘要/Abstract

摘要：

为明确致密砂岩气藏低采收率成因，以子洲气田山2致密砂岩气藏为例，根据气藏采收率定义，建立储量分区动用模型和采收率解析理论模型，通过气藏采收率计算及其成因解释，系统剖析致密砂岩气藏低采收率成因。结果表明，子洲气田山2致密砂岩气藏低采收率成因主要为垂向波及系数、平面波及系数及驱气效率较低。垂向波及系数主要受储集层垂向非均质性影响，驱气效率主要与气藏地层废弃压力有关，平面波及系数主要受储集层平面非均质性及井网控制程度制约。合理部署井网和提高平面波及系数是提高致密砂岩气藏采收率的有效途径，但考虑平面波及系数为100%时，气藏极限采收率仍处于较低水平，因此，加强垂向波及系数和驱气效率技术攻关，是更大幅度提高致密砂岩气藏采收率的关键。

关键词: 致密砂岩气藏, 低采收率成因, 储量分区动用模型, 采收率, 解析理论模型

Abstract:

To identify the causes behind low recovery in tight sandstone gas reservoirs, taking the Shan 2 gas reservoir in the Zizhou gas field as an example, and based on the definition of recovery for gas reservoirs, a zonal reserves producing model and an analytical theoretical model for recovery were established. With the 2 models, the recovery of the gas reservoir was calculated, and the causes behind the low recovery in the tight sandstone gas reservoir were systematically analyzed. The results show that the low recovery in the Shan 2 gas reservoir is primarily attributed to the low vertical sweep coefficient, low plane sweep coefficient, and low gas displacement efficiency. The vertical sweep coefficient is mainly influenced by the vertical heterogeneity of the reservoir, the gas displacement efficiency is closely related to the abandonment pressure of the gas reservoir, while the plane sweep efficiency is primarily constrained by the horizontal heterogeneity of the reservoir and the controlling extent of well pattern. Rationalizing well pattern deployment and enhancing plane sweep coefficient are effective methods for increasing the recovery of tight sandstone gas reservoirs. However, even when the plane sweep coefficient is 100%, the ultimate recovery remains relatively low. Therefore, strengthening research on increasing vertical sweep coefficient and improving gas displacement efficiency is crucial for enhancing recovery in tight sandstone gas reservoirs.

Key words: tight sandstone gas reservoir, low recovery cause, zonal reserves producing model, recovery, analytical theoretical model

中图分类号:

TE328

代金友, 雷禧桢, 师洋阳, 潘志扬, 沈小述, 张立娟, 周晓峰. 致密砂岩气藏低采收率成因[J]. 新疆石油地质, 2025, 46(2): 224-230.

DAI Jinyou, LEI Xizhen, SHI Yangyang, PAN Zhiyang, SHEN Xiaoshu, ZHANG Lijuan, ZHOU Xiaofeng. Causes Behind Low Recovery in Tight Sandstone Gas Reservoirs[J]. Xinjiang Petroleum Geology, 2025, 46(2): 224-230.

图/表 3

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