天然气工业2024，Vol.44Issue(5)：29-44,16.DOI:10.3787/j.issn.1000-0976.2024.05.003
页岩气运移证据及其动态富集模式
Migration evidence and dynamic enrichment model of shale gas:Take the deep shale gas in the southern Sichuan Basin as an example
摘要
Abstract
Shale gas exhibits migration phenomena,but the impact of shale gas migration on shale gas enrichment has not been figured out.To determine the migration evidences and the enrichment model of deep shale gas,this paper takes the deep shale gas reservoir of Lower Silurian Longmaxi Formation in the southern Sichuan Basin as an example to clarify the shale gas migration channels and capacities,based on the natural gas geochemical characteristics of shale gas reservoir,the features of calcite vein inclusion in bed parallel low-angle fractures and the reservoir pore structures.Then,the dynamic enrichment models of Longmaxi Formation shale gas are classified by analyzing typical gas reservoirs.And the following research results are obtained.First,the migration direction indicated by the fluid potential field of the shale gas reservoir is consistent with that indicated by the gas component,which proves the existence of shale gas migration.In addition,the fluid inclusions in bed parallel fractures reveal two migration periods of the Longmaxi Formation shale gas in the study area,which happened in the peak hydrocarbons generation stage and the later uplift stage,respectively.Second,in the present-day Longmaxi Formation shale reservoir in the study area,there are pores available for shale gas migration.The pores in the Longmaxi Formation shale are primarily the pores for Fick diffusion and secondarily for slip flow and Darcy flow.Third,shale gas migration has significant effects on shale gas enrichment.There are five new dynamic enrichment models of shale gas in the study area,i.e.,high uplift transition zone enrichment model,fault loss and anticline transition zone enrichment model,fault loss and syncline core enrichment model,high position enrichment model,and weak migration fault loss model.In conclusion,shale gas migration occurred in the geological history,and the multi-stage migration phenomenon determines the current enrichment degree of shale gas and the selection of enrichment areas.关键词
四川盆地南部/下志留统/龙马溪组/深层页岩气/页岩气运移/动态富集模式Key words
Southern Sichuan Basin/Low Silurian/Longmaxi Formation/Deep shale gas/Shale gas migration/Dynamic accumuation model分类
能源科技引用本文复制引用
缪欢,郑洪扬,姜振学,吴建发,伍秋姿,石学文,邓泽,唐相路,吴伟,陶传奇..页岩气运移证据及其动态富集模式[J].天然气工业,2024,44(5):29-44,16.基金项目
国家自然科学基金项目"深层页岩纳米孔隙介质表面性质及其流体赋存的限域效应"(编号:42372144)、"海相富气页岩低阻成因及其对含气性的控制机理"(编号:42072151),国家能源页岩气研发(实验)中心基金项目"川南深层页岩低电阻成因及其对含气性的影响"(编号:2022-KFKT-15). （编号:42372144）
