The approach to formation evaluation used by Stimulation Petrophysics Consulting is a structured methodology incorporating all the wireline log data (open hole and cased hole), mud logging, drilling and core evaluation that is provided or available into a single interpretation. For display purposes, this petrophysical model is displayed in three sections: (1) the measured log data that goes into the model, (2) Mineralogy and volumetric analysis with resource in place calculations and (3) Mechanical rock properties. The main objective of this evaluation is to determine the reservoir storage capacity, flow capacity, mineralogy and mechanical rock properties while honoring physical data measurements. The results of this analysis are instrumental in the pay zone identification and quantification, stimulation treatment design and reservoir modeling.

When evaluating the tight sand intervals, instead of maxing out the “shale” volume as is typical for a clean formation analysis, an attempt is made to determine the clay volume within these high Gamma Ray intervals. The fluid contents of the free porosity can be evaluated and used for resource evaluations. The figures above show the volumetric and rock properties segments of the Shale Evaluation Analysis log.

Benefits of the Tight Sand Evaluation Log 

1. Resource Assessment: Define pay thickness, original hydrocarbons in place and which sands to combine together in frac stage
2. Capture all the available core data in a calibrated petrophysical model
3. Sand Resource Estimate: Determine the reservoir properties, mechanical rock properties and resource potential of the shales and potential sands between the shales for additional gas resource or to identify the source of unwanted water production
4. Frac Model Inputs: Derive the inputs necessary for importing into the frac model of your choice