特种油气藏2025，Vol.32Issue(6)：86-91,6.DOI:10.3969/j.issn.1006-6535.2025.06.010
河道砂气藏地层可动水评价及对采收率影响
Evaluation of stratigraphic movable water in fluvial channel sandstone gas reservoirs and its impact on recovery
摘要
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 ex-periments,analysis of sealed core data and CT scanning to assess reservoir water mobility and movable intervals,clari-fying 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 reser-voirs retained more water with higher bound-water saturation.At the same decline rate,as water saturation in-creased,gas recovery decreased,and movable water has a greater impact on low-permeability reservoirs.These re-sults are significant for evaluating movable water and calibrating recovery in similar gas reservoirs.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Key words
fluvial channel sandstone/tight sandstone/formation water/water saturation/recovery factor/Tianfu gas field分类
能源科技引用本文复制引用
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):86-91,6.基金项目
中国石油攻关性应用性科技专项"致密砂岩气藏提高采收率关键技术研究"(2023ZZ25) （2023ZZ25）
