Is there anybody having experience on carbonates reservoir evaluation?

[bolkar02]

You can write to me so we can discuss

[ShadowRaven]

G Asquith & D Krygowski AAPG, 1985

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ART

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[caubengo]

Dear Bolkar02, you can find the information about the Carbonate reservoir-Maracaibo Basin by accessing this link:

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[ShadowRaven]

Check if you have any Pe (litho-density) curves they are good to separate calcite vs dolomite/quartz lithofacies;
I also would check on spectral GR (i.e. U-Th-K ratios) and corrected for U (U=organic matter) Gr response

[murthypathi]

Thanks for sharing the book. Excellent forum. Lots of information.

[caubengo]

We have Pe in some wells, but it can not be used in quatitative interpretation due to its abnormal high value (>8 in all intervals).
We have just finished the lithology model using M-N plot and porosity model using 3 porosity log curves and resistivity curves as well for all wells in study area. There is a little problem with DT curve due to its abnormal increase in fracture zones (we don't know how to correct it yet). We try to apply m-variable into Archie formula to calculate Sw (the only problem here is micro resistivity log curve is not available in all wells). Permeability can be estimated using Hydraulic Unit, but there is a big trouble in prediction permeability in uncored well (i try to read some books on this issue but can not to apply it yet because i have no experience in fuzzy logic and neural network). So if anybody has experience in m-variable determination and geostatistics, please share it with me. Thanks alot.

[ShadowRaven]

High Pe means you are in wash-outs; for seismic (AI) analysis you might want to reconstruct pseudo DT/RHOB using general trend lines reflecting compaction

M will drop pretty low and in clean fractured dolomites I was using as low as m=1.2; There were some papers on "variable m" by R Aquilera and his son in SPWLA.

[caubengo]

It's right that Pe indicates wash-out or fracture zone if we use mud with barite while drilling, but the problem is that Pe is very high in all wells. Just forget about Pe. In these wells, not only fractures but also vuggy porosity types exist. We can use Rasmus equation to calculate m in fracture zone, and Nurgent equation for vugs, but how to define these 2 types of porosity without using micro resistivity logs??? SHADOW RAVEN, can you share the paper of R Aquilera to me, if you have any paper on using Hydraulic Unit to predict permeability in uncored wells please share it to me too. I dont have SPWLA account. Thanks alot!!!

[interactive]

G Asquith & D Krygowski AAPG, 1985

[link Point to another website Only the registered members can access]

[link Point to another website Only the registered members can access]
ART

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Hi SadowRaven,
Please upload again, link has been blocked.
Regards

[SLB]

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