Impact of Thermal Maturation on Wave Velocity in the Bakken Shale
- L. Kong (University of North Dakota) | M. O. Ostadhassan (University of North Dakota) | J. Sarout (Csiro Energy Technology) | K. Ling (University of North Dakota) | C. Li (University of North Dakota) | H. Wang (University of North Dakota)
- Document ID
- Society of Petroleum Engineers
- SPE Western Regional Meeting, 22-26 April, Garden Grove, California, USA
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Petroleum Engineers
- 0.2 Wellbore Design, 5.8.4 Shale Oil, 0.2.2 Geomechanics, 5.1 Reservoir Characterisation, 5.1.1 Exploration, Development, Structural Geology, 5 Reservoir Desciption & Dynamics
- Thermal Maturation, Wave Velocity, Bakken Shale, Kerogen
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- 96 since 2007
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Thermal maturation not only affect the geochemical properties of Bakken shale but also impact the geomechanical properties of organic rich shale formations to some extent. In this study, kerogen was modeled as a function of thermal maturation based on differential effective medium theory. Four shale samples were collected and tested by X-ray diffraction(XRD) and Rock Eval to analyze the mineralogy and geochemical properties. Hudson’s model was used to simulate the acoustic properties of Bakken shale affected by the thermal maturity. The result shows an apparent trend between vitrinite reflectance (Ro) with compressional and shear wave velocity. As the Ro increases, the wave velocity decreases due to the kerogen maturation. Especially during certain interval, the decreasing is significant. This study proves caution should be taken when inverting the seismic or logging data to elastic properties of Bakken shale. As this is a theoretical model, more factors should be integrated to have a more accurate result in the future.
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