首页> 美国政府科技报告 >Geologic Controls and Resource Potential of Natural Gas in Deep Sedimentary Basins in the United States. Annual Report, November 1990-November 1991.
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Geologic Controls and Resource Potential of Natural Gas in Deep Sedimentary Basins in the United States. Annual Report, November 1990-November 1991.

机译:美国深层沉积盆地天然气的地质控制与资源潜力。年度报告,1990年11月至1991年11月。

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The report describes an empirical framework for predicting the porosity range of sandstones was developed. For vitrinite reflectance (Ro) >1.1%, the rate of porosity decrease as thermal maturity increases for Anadarko basin non-reservoir sandstones is less rapid than that of sandstones in general. Behavior of porosity and permeability in deeply buried sandstones is due to an interaction of depositional environments, lithologies, diagenesis, and increasing depth of burial. Sequential northeastward partitioning of the Rocky Mountain foreland during Late Cretaceous may be critical to the entrapment of deep natural gas in that region. The presence of geochemically identified source beds of Middle Proterozoic age, active hydrocarbon (HC) seeps, and favorable thermal maturities for generating and preserving natural gas, indicate a source rock potential adequate for economic gas accumulations in flanking basins of the Midcontinent Rift System. High-rank methane generation takes place at higher maturation ranks than previously thought to be the case. Abundant non HC gases in carbonate reservoirs and the presence of H2S indicates that thermochemical sulfate reduction and oxidation of HC's to CO2 may be the dominant control on gas composition in these reservoirs.

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