Tim Armitage Overview Shale Gas Reservoirs The problems with Shale Reservoirs What is needed to Create a usable model Possible solutions to Porosity calculations Total Gas in place Pore ID: 1022470
Download Presentation The PPT/PDF document "Petrophysics of shale gas Reservoirs" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
1. Petrophysics of shale gas Reservoirs Tim Armitage
2. OverviewShale Gas Reservoir's The problems with Shale ReservoirsWhat is needed to Create a usable model Possible solutions to Porosity calculations Total Gas in placePore connectivitySweet spotsSensitivity analysisConclusion
3. Shale Gas Reservoir's Shale Gas Reservoir's need to contain kerogen
4. Problems with Shale Reservoirs No established database of key well data Heterogeneous reservoir conditions create the need for multiple calculations of total gas in place Kerogen: Gas storage Micro fractures: core sample analysis
5. Data needed for Key Well LogSpontaneous Potential logs, Pressure, temperature, resistivity, gamma ray, neutron, sonic and density. X-ray diffraction, X-ray fluorescence, fluid extraction, Nuclear magnetic resonance, Pyrolysis, and Pulse decay permeability readings from Core sampels.
6. Porosity within ShaleThe equation below represents the relationship between total porosity and the many different density’s of the various shale gas components
7. Porosity Continued Tabel 3 shows the variation in calculations due to the need for exact values of the density of kerogen.
8. Total Gas in placeEach reservoir zone needs its own set of average parameters.based on well specificcore log dataThen the gas in place calculation can be used
9. Pore Connectivity Nanopores- kerogin and intergranular shaleMicropores - intergranular shaleMacropores – “cleaner units of the reservoir”Natural fractures
10. Sweet SpotsLow water saturation with high TOC content Low clay content Higher porosityHigher interparticle permeabilityLow fracture initiation pressure
11. Sensitivity analysisKey parameters that have the greatest impact on the estimation of gas in place, productivity and hydraulic fracture design