Category / Old Articles from Student Days

  • For most gas field, key geological variables play an active role in well flow performance and are key to well flow calculations. This is my attempt to explain the implications for well flows caused by differences in reservoir types. Reservoirs can be categorised into unconventional and conventional types. Initial flow calculations are derived from a […]

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  • I recently had cause to work on a mineralized skarn prospect. Here are my generalized notes on skarn type mineralization. Skarn Mineralization A brief description of skarn deposits is included here for the benefit of those who are unfamiliar with this type of mineralization. It is based on a paper by Webster and Ray, 1991. […]

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  • From the previous posts we were manipulating log data to contrast different zones in shallow permian stratigraphy. We can now attempt to interpret the different zones and how this changes at each depth. Beginning with the gamma and density signal, a coal seam is present at 252 to 254 m while at ~282 m there is a […]

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  • August 28, 2014 - Nom Geo

    SP log – quick aside: Interpretation

    In discussing the SP log I am going to refer you to a publication which has an excellent section on the Spontaneous Potential log. It is "Well Logging For Earth Scientists" By Ellis and Singer and I highly recommend that you buy or borrow a copy.     So on to our sample well. The […]

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  •   Spontaneous potential measures the naturally occuring potentials in a wellbore for each depth. In petrophysics it is useful for formation water resistivity, clay content and bed thickness estimations. In geology it is useful for facies identification, textural character and bed correlations between logged wells. To explain further, there are two types of potential being measured. 1)electrochemical […]

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  • This is a quick look at a bunch of rocks and some notes on making common rock descriptions. You might find it useful as background reading for academic use or to aid identification. It has been done in the style of a quick rock identification exercise. By using physical properties to build up some evidence a systematic […]

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  • Today’s question – can well logs be used to determine different groundwater zones? Here we are using Archie’s law to find formation water resistivity. I hope this article is useful. Any questions, suggestions or if it needs correction then you are welcome to leave a comment below. Flow chart for suggested steps in performing the first part […]

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  • This article is for a petrophysical study of geological formation pore pressure d exponent analysis using drilling data. If you find this interesting or in need of correction please leave a comment. The d exponent uses drilling performance to look at variations in drilling performance to infer changes in formation pore pressure. Since the drilling performance is […]

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