大庆石油地质与开发2026，Vol.45Issue(3)：58-65,8.DOI:10.19597/J.ISSN.1000-3754.202505006
古龙页岩限域空间的原位相态与组分变化特征
Characteristics of in-situ phase and composition variation in confined space of Gulong shale
摘要
Abstract
Gulong shale in Songliao Basin is a pure shale-type reservoir,with storage space dominated by pores with pore size of tens of nanometers and micro-fractures.Fluids in these nano-scale pores and fractures exhibit complex phase behavior due to the confined space effect,and phase transition and component migration during depressuriza-tion development remain unclear.By establishing a confined fluid phase calculation model,the in-situ phase char-acteristics of Gulong shale are clarified.A developed constant composition expansion(CCE)experimental simula-tion software is applied to quantify composition variation in pore fluids with different pore sizes,finally establishing a multi-scale spatial shale oil phase transition model for depressurization development.The results show that,com-pared to bulk fluids,the bubble/dew points of confined fluids decrease significantly.As pressure decreases,light components preferentially migrate with significant amounts of C2-5 and C6-10 released into the gas phase,while heavy components are retained in nano-pores as undersaturated fluids.Methane is continuously released.This simulation results are consistent with the trend of oil and gas composition monitoring results from Well GYP1.During the devel-opment process,macropores maintain a black-oil state,mesopores(weak confinement)transition from volatile to black-oil state,and micropores(strong confinement)evolve from condensate to volatile and then to black-oil state.The research reveals the in-situ phase characteristics of micro-nano pores and component migration patterns during depressurization development,clarifying multi-scales spatial phase transition pattern during development process and providing theoretical guidance for understanding the original occurrence state and reasonable and effective de-velopment of shale oil reservoirs.关键词
古龙页岩/纳米孔隙/限域效应/组分运移/相变模式Key words
Gulong shale/nano-pores/confinement effect/component migration/phase transition model分类
能源科技引用本文复制引用
李斌会,王青振,曲方春,李佳伟..古龙页岩限域空间的原位相态与组分变化特征[J].大庆石油地质与开发,2026,45(3):58-65,8.基金项目
国家自然科学基金项目"中高熟陆相页岩油富集理论与绿色有效开发基础研究"(U24B600404) （U24B600404）
黑龙江省重点研发计划创新基地项目"多资源协同陆相页岩油绿色开采全国重点实验室"(JD2023GJ02) （JD2023GJ02）
国家科技重大专项"松辽盆地白垩系陆相页岩油勘探开发技术与集成示范"(2024ZD1404904). （2024ZD1404904）
