Tuesday morning: Paleogene Reservoirs and Stratigraphy, Gulf of Mexico
2007. "Tuesday morning: Paleogene Reservoirs and Stratigraphy, Gulf of Mexico", The Paleogene of the Gulf of Mexico and Caribbean Basins: Processes, Events and Petroleum Systems, Lorcan Kennan, James Pindell, Norman C. Rosen
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Onshore at the rim of the Gulf of Mexico basin near Dallas, Texas, deposition in the Fort Worth basin during the Cretaceous and early Tertiary is the primary factor controlling maturation of the Mississippian age Barnett Shale source rock. During Laramide time, uplift of up to 2 km in the Fort Worth basin ends the generation of hydrocarbons from the Barnett Shale and the eroded sediments constitute a significant source of sediment for the Gulf of Mexico Basin. Although the Fort Worth basin is only one of many sources of sediment to the Gulf of Mexico, it is the accumulation of material from these ages that affects reservoir properties of the Paleogene age sediments in the deep water Gulf of Mexico. The emerging deep water Paleogene play in the Gulf of Mexico has seen several large discoveries in recent years in water depths greater than 2 km. Discovered hydrocarbons have gas-oil-ratios (GOR) significantly less than bubble point pressures suggesting early source rock maturity and late migration of hydrocarbons into traps. Paleogene reservoirs are typically encountered at depths greater than 5 km below mud line, and reservoir temperatures are greater than those encountered in lower Miocene reservoirs in the Green Canyon and Mississippi Canyon areas. These reservoir temperatures suggest quartz diagenesis may be a significant factor affecting the flow rates in individual wells in the play. This paper links together the history of Paleozoic onshore Fort Worth basin in the upper Gulf Coast and the Paleogene section in the deep water Gulf of Mexico utilizing long, regional 2D seismic lines extending from the rim of the Gulf of Mexico Basin to the current abyssal plain. Results from the two dimensional, integrated basin model developed from this present day section allow pressure, temperature, and effective stress histories to be developed over the Gulf of Mexico Basin. This study is the beginning of a more integrated physical understanding of these two diverse but related plays.