天然气勘探与开发2025，Vol.48Issue(3)：76-84,9.DOI:10.12055/gaskk.issn.1673-3177.2025.03.008
东方区异常高压气藏应力敏感特征差异性分析
Differences in stress sensitivity of abnormally high pressure gas reservoirs in Dongfang area,Yinggehai Basin
摘要
Abstract
To investigate the variation laws and differences in target areas of the stress sensitivity of the abnormally high pressure gas reservoirs in the Neogene Miocene Huangliu Formation,Dongfang(DF)area,Yinggehai Basin,three typical target areas(DF13-A,DF13-B and DF13-C)were selected for evaluation experiment on the permeability stress sensitivity of cores with bound water under high temperature and high pressure(HTHP).Moreover,the reservoir characteristics were systematically studied through various experimental means involving rock mechanics,scanning electron microscope(SEM),mercury intrusion porosimetry,and nuclear magnetic resonance(NMR),so as to further identify the differences and controlling factors of the stress sensitivity.The results are obtained in four aspects.First,physical properties are the main factors controlling the permeability stress sensitivity of the HTHP gas reservoirs in the area.The better the physical properties,the weaker the stress sensitivity.Second,Even under the same physical property conditions,there are still significant differences in stress sensitivity(the strongest in DF13-C,followed by the one in DF13-B,and the weakest in DF13-A).This is believed to be related to the different compositions of clay minerals and internal pore structures of reservoirs in the target areas.Third,there exists water sensitivity and velocity sensitivity damages in the illite/smectite(I/S)mixed layers,under the same clay mineral content,the high proportion of I/S mixed layers and the pore structure complexity will aggravate the permeability loss rate under the action of stress,allowing the reservoirs to exhibit strong stress sensitivity.Fourth,the influence of pore structure on stress sensitivity is primarily due to the differing contributions of pore throats at various scales to permeability and the extent to which they are affected by stress.Specifically,large pore throats contribute significantly to permeability and undergo greater changes under stress compared to small pore throats.As a result,the permeability of large pore throats declines substantially.It is concluded that the stress sensitivity of the abnormally high pressure gas reservoirs in the DF area is mainly related to physical properties,clay mineral compositions,and pore structures.关键词
莺歌海盆地/东方区/新近系中新统黄流组/异常高压气藏/应力敏感/差异性/高温高压实验Key words
Yinggehai Basin/Dongfang area/Neogene Miocene Huangliu Formation/Abnormally high pressure gas reservoir/Stress sensitivity/Difference/HTHP experiment引用本文复制引用
张华,赵楠,朱绍鹏,冯小龙,彭小东..东方区异常高压气藏应力敏感特征差异性分析[J].天然气勘探与开发,2025,48(3):76-84,9.基金项目
中国海洋石油集团有限公司重大专项项目(编号:CNOOC-KJ135ZDXM38ZJ). （编号:CNOOC-KJ135ZDXM38ZJ）
