Vatican City

Coal rank depends on the temperature of coalification. In the Illinois Basin, midwestern United States, coal rank is not dependent on thickness of overlying sediments as shown by vitrinite reflectance. Heat advected into the basin by groundwater flow contributed to the coal rank anomaly.

A flexible, object-based rock reconstruction algorithm reproduces the microscale micritic fabrics of microporous carbonates. Results quantify the importance of micropores in contributing to or controlling overall flow and sweep characteristics in such fabrics.

Critical factors related to topographic, geologic, and hydrologic features are important for the creation and preservation of underpressure present in the Midcontinent of the United States. One of these areas is the large, highly saline brine plume of western Oklahoma and Kansas.

Exploration in the Putumayo basin and adjacent thrust belt, Colombia, has resulted in variable oil quality. To better understand the reasons, the authors reconstructed the structural evolution, the timing of oil migration, and the timing of groundwater infiltration in the region.

Borehole images are useful for in-depth characterization of fluvial deposits in the Upper Cretaceous of the Piceance Basin, Colorado. This procedure is especially useful in the reconstruction of paleomorphology, flow, regime, and fluvial architecture.

Tight-gas reservoirs that have experienced late uplift following an earlier phase of charge are unlikely to be characterized by primary drainage and are much more likely to be characterized by imbibition (the displacement of one fluid by another) or by secondary drainage.