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Line 14: − ==Petroleum geology== − − [[file:predicting-reservoir-system-quality-and-performance_fig9-96.png|300px|thumb|{{figure number|1}}Location of Weyburn field. Copyright: Coalson et al.;<ref>Coalson, E. B., S. M. Goolsby, and M. H. Franklin, 1994, Subtle seals and fluid-flow barriers in carbonate rocks, in J. C. Dolson, M. L. Hendricks, and W. A. Wescott, eds., Unconformity Related Hydrocarbons in Sedimentary Sequences: RMAG Guidebook for Petroleum Exploration and Exploitation in Clastic and Carbonate Sediments, p. 45–58.</ref> courtesy RMAG.]] Line 25:
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Weyburn field location and trap problem (view source)
Revision as of 17:34, 3 January 2024
, 3 Januaryno edit summary
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Weyburn field, in the Williston basin of Saskatchewan, produces oil from the Midale Member of the Mississippian Mission Canyon Formation.<ref name=ch09r9>Chetin, A. K., and W. W. Fitkin, 1959, Geology of the Weyburn field, Saskatchewan: Canadian Mining and Metallurgical Bulletin, December, p. 751–761.</ref>
Weyburn field, in the Williston basin of Saskatchewan, produces oil from the Midale Member of the Mississippian Mission Canyon Formation.<ref name=ch09r9>Chetin, A. K., and W. W. Fitkin, 1959, Geology of the Weyburn field, Saskatchewan: Canadian Mining and Metallurgical Bulletin, December, p. 751–761.</ref>
==Weyburn trap problem==
==Weyburn trap problem==
[[file:predicting-reservoir-system-quality-and-performance_fig9-96.png|thumb|300px|{{figure number|1}}Location of Weyburn field. Copyright: Coalson et al.<ref>Coalson, E. B., S. M. Goolsby, and M. H. Franklin, 1994, Subtle seals and fluid-flow barriers in carbonate rocks, in J. C. Dolson, M. L. Hendricks, and W. A. Wescott, eds., Unconformity Related Hydrocarbons in Sedimentary Sequences: RMAG Guidebook for Petroleum Exploration and Exploitation in Clastic and Carbonate Sediments, p. 45–58.</ref>, courtesy RMAG.]]
To determine the trap type of Weyburn field, we have to know what forms the lateral closure. It is not structural because [[dip]] is homoclinal to the southwest. The field lies southeast of the truncation edge of the Midale Member, where it wedges out beneath Triassic rocks and above older Mississippian rocks. Early workers understood this truncation to be the cause of the trap. Yet there is an area lying downdip from the truncation edge of the Midale and updip from the oil pool in which porous Midale vuggy rocks were present but tested wet with shows of oil.
To determine the trap type of Weyburn field, we have to know what forms the lateral closure. It is not structural because [[dip]] is homoclinal to the southwest. The field lies southeast of the truncation edge of the Midale Member, where it wedges out beneath Triassic rocks and above older Mississippian rocks. Early workers understood this truncation to be the cause of the trap. Yet there is an area lying downdip from the truncation edge of the Midale and updip from the oil pool in which porous Midale vuggy rocks were present but tested wet with shows of oil.