摘要
为提高页岩气储层岩心孔隙度测量精度,明确孔隙度测量的影响因素,实验探讨了岩心不同干燥温度、不同注入压力测量条件及不同测量方法(核磁共振测量法、氦气膨胀法、饱和液体称重法)等对实验结果的影响。结果表明:干燥温度小于90℃时,孔隙度测量值随干燥温度的增加而增加;干燥温度为90~110℃时,孔隙度值变化较小;干燥温度大于110℃时,孔隙度又重新出现明显增大;当氦气注入压力小于2.0 MPa时,随注入压力的增加,孔隙度测量值增大;当氦气注入压力大于2.0 MPa时,孔隙度测量值趋于稳定。岩心饱和水称重孔隙度和饱和水核磁孔隙度明显大于饱和油核磁孔隙度以及氦气孔隙度;饱和油称重孔隙度和饱和油核磁孔隙度略小于氦气孔隙度。综合考虑页岩吸水膨胀及不同孔隙组分润湿性的差异,测量岩心孔隙度时,推荐使用氦气膨胀法测量孔隙度,建议最佳注入压力为2.0 MPa、最佳干燥温度为110℃。该项研究对提高页岩气储层孔隙度测量精度具有借鉴意义。
In order to improve the accuracy of core porosity test in shale gas reservoir and identify the influencing factors of porosity test,the effects of drying temperature,charging pressure and test method on the porosity test result were investigated by laboratory experiments（magnetic resonance,helium expansion,saturated liquid weighing）.Result shows that when the drying temperature is less than 90 ℃,the test porosity increases with the increase of drying temperature.When the drying temperature is 90 ~ 110 ℃,there is no significant fluctuation for the test porosity.When the drying temperature exceeds 110 ℃,the test porosity re-increases with drying temperature.When the helium charging pressure exceeds 2.0 MPa,the test porosity increases with the increase of charging pressure.When the helium charging pressure is less than 2.0 MPa,the test porosity value keeps constant.The saturated water weighing porosity and saturated water nuclear magnetic porosity are significantly higher than the saturated oil nuclear magnetic porosity and helium gas porosity.The saturated oil weighing porosity and saturated oil nuclear magnetic porosity are slightly less than helium porosity.In view of the shale swelling after water saturation and wettability difference in pores,helium expansion is recommended in shale porosity test with the optimal charging pressure of2 MPa and the optimal drying temperature of 110 ℃.This research could provide certain reference for improve the porosity test accuracy of shale gas reservoir.
作者
付永红
司马立强
张楷晨
王亮
邓茜
Fu Yonghong;Sima Liqiang;Zhang Kaichen;Wang Liang;Deng Qian(Southwest Petroleum University,Chengdu,Sichuan 610500,China;Fujian China Petroleum Oil Storage Co.,Ltd.,Quanzhou,Fujian 362700,China;PetroChina Southwest Oil ＆Gas field Company,Chengdu,Sichuan 610041,China)
出处
《特种油气藏》
CAS
CSCD
北大核心
2018年第3期144-148,174,共6页
Special Oil & Gas Reservoirs
基金
国家自然科学基金"页岩气储层微观孔隙结构连续定量表征与含气量评价"(41504108)
国土资源部沉积盆地与油气资源重点实验室开放性基金"页岩气储层含气量评价"(Zdsys2015003)
四川省教育厅自然科学类基金"页岩气储层微观孔隙结构实验表征及连续定量评价方法"(15ZB0057)
关键词
页岩气储层
孔隙度
充注压力
干燥温度
孔隙度对比
shale gas reservoir
porosity
charging pressure
drying temperature
porosity comparison
