..and again
==============
Following the completion of the first suite of wireline logging, a zone of interest in the
secondary objective in the 200 Horizon target coincident with observed seismic amplitude
anomalies was interpreted to contain potential hydrocarbons based on significantly elevated
resistivity (two orders of magnitude above baseline) across a 10-15m interval from
approximately 785m MD and separation between shallow, medium and deep resistivity
readings.
Further analysis of this zone was interpreted to have tight reservoir properties with complex
mineralogy and a decision was made to forgo running the formation pressure/sampling
wireline tool without the appropriate sampling probe and packers available.
The decision was made with careful consideration of several factors, including the ability to
obtain valid pressure measurements and fluid samples in tight reservoir and significantly
overbalanced hole conditions with the increased risk of tool sticking and potential loss due to
the heavy mud weight used in this hole section
=======================================
Overbalance pressure affects rock porosity, where increasing the overbalance pressure from 300 to 1000 psi causes total porosity reduction from 21.6 to 14.2% with a 34% reduction for the rock porosity after the mud–rock exposure.
=======================================
What I am trying to get at is, was really the 200 Horizon a tight reservoir or is the mud/overbalance condition that compromised permeability?
Remember the 200 Horizon was/is not the primary target, hence one more reason not to risk sticking tools issues but also if they were without the appropriate sampling probe and packers available, how the fracking where they going to run a sampling/pressure test ???????
So let me rephrase this, the formation is tight, maybe is due to mud and overbalance conditions, there is the risk that tool will stick and we don't even have the tools.
lolololol at least its funny.
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