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porosity in gas shale calculation

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porosity in gas shale calculation

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Anulacp Joined: Tue Jul 19, 2011 10:50 am Posts: 3	porosity in gas shale calculation Hello, I need your help. I have to calculate porosity in shale (potencially gas/oil shale). I have sonic log, GR, laterolog and neutron log (this one is not calibrated into porosity units, but is in counts/min). All logs are old fashioned Soviet logs only on sheetpapers. Now question: can I freely apply GR to calculate Vsh in shale; and can I apply Willy equation for calculating porosity in shale? Will it be correct? I have many doubts, that's why I ask for help. All calculation have to be done with no software.
Tue Jul 19, 2011 11:04 am

agganitk Joined: Tue Mar 15, 2011 3:13 pm Posts: 20	Re: porosity in gas shale calculation .Unless you don't have calibration of Neutron tool, you can't covert counts into porosity measured. I mean how we know how much counts corresponds to how much porosity. There should be calibration or something mentioned in the log somewhere. Please let me know if there is anyway to covert counts into porosity without having calibration.
Wed Jul 20, 2011 7:12 am
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Anulacp Joined: Tue Jul 19, 2011 10:50 am Posts: 3	Re: porosity in gas shale calculation Thanks for reply. I have found out that it's possible. See: http://www.spec2000.net/17-specancient.htm However, I do not know how much I can trust it.
Wed Jul 20, 2011 9:25 am

agganitk Joined: Tue Mar 15, 2011 3:13 pm Posts: 20	Re: porosity in gas shale calculation Good to know...Just be sure about constraints and correct chart when you use this method. cheers..
Wed Jul 20, 2011 9:47 am

celinaaniston86 Joined: Thu Dec 15, 2011 9:52 am Posts: 4	Re: porosity in gas shale calculation I extremely do not suggest to use sonic logs for porosity evaluation in gas reservoirs, because of gas impact. The best supply of porosity information in gas shale is, of course, density tool.
Thu Dec 15, 2011 10:03 am

naveedtells Joined: Mon Dec 05, 2011 10:24 pm Posts: 19	Re: porosity in gas shale calculation Can anybody help me understand CT scanning and how it can help in Shale porosity calculation? _________________ SHAKEEL AHMAD EXPLORATION GEOLOGIST My Blogs: Latest Petrophysics: G & G Software Videos: Petroleum Geology Downloads: http://geoilam.blogspot.com/
Mon Dec 19, 2011 6:28 pm
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