河道砂气藏地层可动水评价及对采收率影响

doi:10.3969/j.issn.1006-6535.2025.06.010

摘要/Abstract

摘要： 天府气区沙一段气藏试采过程中部分井见水,地层中是否有可动水以及对采收率的影响尚不明确。针对以上问题,以天府气区沙一段河道砂气藏为研究目标,利用室内气驱水实验、密闭取心井资料分析及CT扫描技术,研究河道砂气藏地层水可动性及可动区间,明确地层水在多孔介质中的赋存状态。同时建立高温高压可动水对气水两相产能影响的实验模拟方法,评价了河道砂气藏可动水对采收率的影响。研究表明:X211、X206、X212 三口密闭取心井含水饱和度均大于实验岩心的束缚水饱和度,地下为气水两相共存状态,平均可动水饱和度分别为21.31%、18.41%、7.93%;岩心气驱后气体均优先波及大孔隙,地层水主要存在于小孔隙中,储层越致密,地层水留存越多,束缚水饱和度越高;同一衰竭速度下,随含水饱和度增加,采收率降低,可动水对低渗透储层的影响更大。研究成果对同类气藏的可动水评价及采收率标定具有重要意义。

关键词: 河道砂, 致密砂岩, 地层水, 含水饱和度, 采收率, 天府气区

Abstract: During test production in the Sha-1 section of the Tianfu gas field,some wells encountered water,but it remains unclear whether movable formation water is present and how it affects recovery.To address this,study was made on the fluvial channel sandstone gas reservoir of the Tianfu Sha-1 section using laboratory gas-drive-water experiments,analysis of sealed core data and CT scanning to assess reservoir water mobility and movable intervals,clarifying the occurrence state of formation water in the porous medium.We also established a high-temperature high-pressure experimental simulation of movable water′s effect on gas-water two-phase deliverability was to evaluate how movable water influenced recovery.The study showes that the water saturations of three sealed cores(X211, X206, X212)all exceeded the irreducible water saturation of the experimental cores,indicating a coexistence of gas and water in the reservoir;average movable water saturations were 21.31%,18.41% and 7.93% respectively.After gas-drive tests,gas preferentially swept large pores,while formation water mainly occupies small pores-tighter reservoirs retained more water with higher bound-water saturation.At the same decline rate,as water saturation increased,gas recovery decreased,and movable water has a greater impact on low-permeability reservoirs.These results are significant for evaluating movable water and calibrating recovery in similar gas reservoirs.

Key words: fluvial channel sandstone, tight sandstone, formation water, water saturation, recovery factor, Tianfu gas field

中图分类号:

TE343

李明秋, 张广东, 于鹏, 王会强, 胥伟冲, 时尔翰, 丰妍. 河道砂气藏地层可动水评价及对采收率影响[J]. 特种油气藏, 2025, 32(6): 86-91.

LI Mingqiu, ZHANG Guangdong, YU Peng, WANG Huiqiang, XU Weichong, SHI Erhan, FENG Yan. Evaluation of stratigraphic movable water in fluvial channel sandstone gas reservoirs and its impact on recovery[J]. Special Oil & Gas Reservoirs, 2025, 32(6): 86-91.

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