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| no porosity and high density http://www.epgeology.com/petrophysics-f23/porosity-and-high-density-t2833.html |
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| Author: | Petsavvy [ Thu Aug 30, 2012 5:14 pm ] |
| Post subject: | no porosity and high density |
In my reservoir (tidal flat)there are no. of wells showing poor development of porosity or no porosity in logs as well as showing high density value. but when it comes to production wells are producing with high rate(after HF) and produced good amount of oil. can some body suggest that what could be the reason of good production or can suggest some log which can record if thin layers of sand and shale layer exist.Since my reservoir is only 5-10 m thick. |
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| Author: | kokokyi [ Fri Aug 31, 2012 1:12 pm ] |
| Post subject: | Re: no porosity and high density |
Try running an image log to identify the thin layers of shales and sand. If you are using water base mud you can run the resistivity imaging log, e.g. FMI (from Schlumberger), GeoExplorer (from Baker Hughes). In case of oil base mud, you run an Oil Base Mud imager like OBMI (from Schlumberger). You can also try running an ultrasonic imaging log such as UBI (from Schlumberger) or CBIL (from Baker). However, the vertical resolution of the ultrasonic imaging log will not be as good as that of a resistivity imaging log. After you have identified the presence of thinly bedded sand-shale layers, you can try running a triaxial induction resistivity log such as Rt Scanner (from Schlumberger) or 3DEX (from Baker) to derive Rv (Vertical Resistivity) and Rh (Horizontal Resistivity). Then using Rv and Rh, you can derive the Rsand (resistivity of sand) and Rshale (resistivity of shale) so that you can compute water saturation in the sands. All three major logging companies (Schlumberger, Baker Hughes and Halliburton) have similar imaging tools and directional induction resistivity tools. |
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