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LIVE WEBINAR – Integrated Approaches to Determining Net Pay: Caveats & Lessons Learned
Thursday, 4 June, 2020 @ 11:00 am - 12:00 pm (Australia/Perth time)Free – $10
Kindly supported by Rock Flow dynamics
This live webinar will take place at:
11am – Perth
12.30pm – Adelaide and Darwin
1pm – Brisbane, Canberra, Hobart, Melbourne, Sydney
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Integrated Approaches to Determining Net Pay: Caveats & Lessons Learned
Presented by John Kaldi
Net pay is the formation thickness within the hydrocarbon column that can be produced economically. The most common methods for determining net pay include wireline log cut-offs e.g. gamma ray (sand vs shale percentage), resistivity (hydrocarbon vs water saturation) and porosity (rock vs pore volume).
This presentation details case histories from around the world that highlight various challenges with relying on many of these methodologies. Overly simplistic assumptions of wireline log response, and poor understanding of fundamental rock and fluid properties in the formation, have caused misinterpretation of pay in many formations. Examples include incorrect v-shale cut-offs due to shale clasts, incorrect density porosity calculations caused by extreme mineral densities, incorrect neutron porosity cut-offs due to microporous reservoirs, and misinterpreted fluid compositions (on resistivity logs) due to conductive minerals in the formation. Potential errors in quantifying reservoir properties may occur even when core data are plentiful. This is commonly due to core plug sampling bias, either from poor core and/or core plug recovery or due to human sampling bias; both biases result in over or under representation of particular rock types. Often, production mechanism and net pay interpretation are not considered together. Pay on primary production, may not equate to pay on waterflood, if the flooded formation is discontinuous or sweep efficiency is low. In addition, production or injection zone tests (eg PLT), are rarely correlated to rock types in a formation, thus leading to mismatch between actual and interpreted pay zones. Net pay determination is improved markedly when petrophysical properties are linked to field-specific production mechanisms.