Using Advanced Logging Measurements to Develop a Robust Petrophysical Model for the Bakken Petroleum System
- Gary Simpson (Hess Corporation) | John Hohman (Hess Corporation) | Iain Pirie (Schlumberger Oilfield Services) | Jack Horkowitz (Schlumberger Oilfield Services)
- Document ID
- Society of Petrophysicists and Well-Log Analysts
- Publication Date
- October 2015
- Document Type
- Journal Paper
- 457 - 478
- 2015. Society of Petrophysicists & Well Log Analysts
- 2 in the last 30 days
- 413 since 2007
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The Bakken petroleum system (BPS) can be considered a hybrid play because it is composed of both conventional and unconventional elements. The conventional aspects include the presence of separate reservoir intervals (Scallion, Middle Bakken, Sanish and Three Forks) and source-rock intervals (Lower Bakken and Upper Bakken shales) along with more problematic intervals (Basal Bakken). This is in direct contrast to most unconventional shale plays, in which a single lithologic or stratigraphic interval comprises both the source rock and the reservoir. The unconventional aspects of the BPS include very low permeability conventional reservoir sections and combined shale-rich source and reservoir intervals. Additional complexity results from stacked depositional environments with significant variations in lithofacies, mineralogy, total organic carbon (TOC), and rock textures ranging from highly bioturbated to finely laminated.
Based on these complexities, a series of research wells were drilled, cored over the entire BPS, and logged extensively using advanced logging devices. Petrophysical models were developed using both deterministic and probabilistic methods to integrate the measurements acquired for the analysis of porosity, saturation, and mineralogy and for describing the hydrocarbon production potential of the BPS more accurately. The advanced evaluation results will enable us to use these wells as benchmarks and calibration points for computation models being developed in areas of the basin where only minimal logging suites such as triple-combo logs exist as data. The confidence gained from these advanced petrophysical models will ensure that the basinwide models, which encompass the entire BPS, will better represent the actual production results.
|File Size||56 MB||Number of Pages||22|