Fracture Gradient Above Overburden
/Does anyone know of any published material on Barents Sea fracture gradients which explain why sometimes the fracture gradient is equal to or greater than the overburden gradient?
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Can Geomechanics Improve Your Drilling and Completions: Spoiler Alert – Yes!
/Webinar by Amy Fox, PhD
Your Next Dry Hole Will Be Caused By Seal Failure
/Two of the major components in conventional prospects, trap geometry, and reservoir presence can be so fully evaluated that these components often carry minimal exploration risk. In part as a consequence of this, the primary cause for dry holes and sub-economic discoveries has now shifted to being seal failure. A survey done by Schlumberger proposes that 45% of industry dry holes are owing to lack of seal. A recent paper by Rudolph and Goulding (2017) supports this describing a lookback study of exploration drilling by Exxon for a ten year period and finding that 50% of their dry holes were owing to trap failures and this percentage actually increased to 60% of dry holes in mature well understood plays. Despite this, there is a major mismatch between the importance of seals in hydrocarbon trapping and the sophistication of seal evaluation. In most workflows, seal evaluation is commonly done with little technical rigor during the time squeeze at the end of a prospect evaluation and the seal evaluation is often so superficial as to be nearly meaningless.
Petrophysics Lecture: Capillary Pressure
/Be familiar with the concept of "capillary pressure" for tubes as well as porous media --- and be able to derive the capillary pressure relation for fluid rise in a tube:
Beach Balls Explained: Thrust Faults
/@AK Earthquake Here's part 2.
Beach Balls Explained: Strike-Slip Faults
/@AKearthquake During coverage of the M7.9, you might have seen a cryptic, beach ball-looking symbol used as a way of showing that it was a strike-slip earthquake, unlikely to generate a major tsunami. Here's Helena Buurman's visual explainer. You might need to download and view on a desktop.
Hoek-Brown failure criteria in Python
/A simple guide to calculate the Hoek-Brown Failure Criteria in Python
Reliability in pore pressure measurements
/Could someone suggest any articles and/or book about reliability in pore pressure measurements?
Tectonic evolution effect to the existence of overpressure in a basin
/I wonder whether tertiary tectonic evolution will give influence to the existence of overpressure in a certain basin or sub-basin? I mean, what kind of tectonic sequence which will be a cause of the existence of overpressure in a basin?
Pore Pressure Prediction In Tight Gas Reservoirs
/How can we estimate pore pressure in a tight gas reservoir relying on a conventional log suite? Is there any workflow or correlation?
Pore Pressure Prediction from Seismic Impedance
/Does anyone have some information about pore pressure prediction directly from seismic impedance ? How I can calculate required parameters for this purpose?
Eaton's Empirical Equation
/For a pore pressure prediction using Eaton's empirical equation, does anyone actually use Katahara's correction of subtracting the velocity at the mud line (Katahara, 2003)? I have found that term adds too much uncertainty if you want to invert for the exponent n, as per Sayers, 2002.
Understanding the Mystery of Earthquake Beach Balls
/Written by Dr. Gemma Smith, Geologist & Geophysicist
Dr. Gemma Smith is a young Research Assistant in Earth Sciences at the University of Southampton. Her PhD did focus on the geophysical investigation of the Makran subduction zone, in order to further understand its deformation and seismogenic potential. The Makran Subduction Zone experienced a tsunamigenic Mw 8.1 earthquake in 1945 and recent, smaller earthquakes also suggest seismicity on the mega-thrust, however its historical record is limited and hazard potential enigmatic
Pore Pressure Prediction in Tuffaceous Formations
/Pore pressure prediction in tuffaceous formations - which methods should be used there? How one can assess the strength of such formation having only basic set of logs (density, neutron porosity, compressional sonic, resistivity)?
Validation of pore pressure prediction
/I've have a result of a pore pressure prediction. My question is, how do I validate what I've calculated? Does it has something to do with reservoir pressure or estimated pore pressure from pressure log?
Estimation of pore pressure in evaporite layers
/Does anyone have some information about how to measure and estimate the pore pressure in the evaporite layers, particularly Gachsaran formation in the Iranian oil fields?
Eaton exponent
/Has tried Eaton exponent equal to 1.5 or 2 (for PPP from compressional sonic wave velocity)
Rock strength calculation
/Does anybody can give some suggestions about rock strength calculation by using DT and GR? Any articles, information, or published papers are highly appreciated.
Mud weight and borehole stability
/Can anyone provide links to some useful papers regarding mud weight and borehole stability?
Density extrapolation
/I have assumed sediments density at the earth surface in a case in order to calculate overburden stress and gradient and now i have to extrapolate it to the first measurement point on the density log. How this extrapolation will be carried out?