A Pyramid Scheme: Integrating Petroleum Systems Analysis into Probabilistic Petroleum Resource Assessments
Petroleum supply has been transformed by innovations including horizontal drilling and multiple-stage hydraulic fracturing applied to low permeability reservoirs. These new commercial resources present a challenge to petroleum valuation and resource assessment. Shale-hosted petroleum resources are often inferred “continuous” and amenable to “unit-cell” resource assessment methods. However, commercial reservoirs are generally not shale and the resources are demonstrably not “continuous”. Shale-hosted petroleum resources typically have large amounts of discovery history and well data such that unconventional accumulations can be identified in wells. By introducing more diverse exploration history data combined with petroleum system constraints on contingent accumulations in combination with geographically based probabilistic resource assessment methods we develop an alternative method for assessing shale-hosted petroleum resources. A benefit of the proposed method is that it indicates where overpressures, which are a source of reservoir energy, occur.
KeywordsDiscovery Sequence Drill Stem Petroleum System Resource Volume Petroleum Accumulation
- 1.Burrus, J., Osadetz, K. G., Wolf, S., Doligez, B., Visser, K., & Dearborn, D. (1996). A two-dimensional regional basin model of Williston Basin hydrocarbon systems. American Association of Petroleum Geologists Bulletin, 80, 265–291.Google Scholar
- 3.Hansen, W. B., & Long, G. I. W. (1991). Bakken production and potential in the U.S. and Canada: can the fairway be defined? In W. B. Hansen (Ed.), 1991 guidebook to geology and horizontal drilling of the Bakken Formation (pp. 69–88). Montana: Montana Geological Society.Google Scholar
- 4.Hansen, W. B., & Long, G. I. W. (1991). Criteria for horizontal and vertical prospect generation in the Bakken Formation, Montana and North Dakota. In W. B. Hansen (Ed.), 1991 guidebook to geology and horizontal drilling of the Bakken Formation (pp. 151–164), Montana: Montana Geological Society.Google Scholar
- 5.Klett, T. R. (2003). Graphic comparison of reserve-growth models for conventional oil and accumulation. USGS Bulletin, 2172-F.Google Scholar
- 6.Masters, J. A. (1984). Elmworth: case study of a deep basin gas field. American Association of Petroleum Geologists Memoir, 38, 316.Google Scholar
- 7.Purewal, S., Choquette, S., Gold, D., & Mallon, K. (2011). Guidelines for the application of the Petroleum Resource Management System. Society of Petroleum Engineers. http://www.spe.org/industry/docs/PRMS_Guidelines_Nov2011.pdf, p. 222.
- 8.Reinson, G. E., Lee, P. J., Warters, W., Osadetz, K. G., Bell, L. L., Price, P. R., et al. (1993). Part I: geological play analysis and resource assessment; in: Devonian gas resources of the Western Canada sedimentary basin. Geological Survey of Canada Bulletin, 452, 1–127.Google Scholar