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This file contains 18 gross isopach grids that represent true vertical thickness (TVT) values by calculating the difference between 19 stratigraphically adjacent horizons picked on borehole geophysical logs in the Southwestern Wyoming Province. In wells where adjacent horizons are missing, no TVT value is calculated. The TVT values are a measure of vertical thickness and do not account for the structural dip of units encountered in the wellbore. The 19 stratigraphic horizons include: top Almond Formation (base Lewis Shale), top lower Lewis Shale (base Asquith marker), top Asquith marker, top flooding surfaces F1-15, and top Fox Hills Sandstone. For more detailed stratigraphic information, please see the associated...
This file contains 15 net sand isopach grids that represent the summed true vertical thickness (TVT) of sand intervals between 15 stratigraphically adjacent horizons picked on borehole geophysical logs in the Southwestern Wyoming Province. In wells where adjacent horizons are missing, no TVT value is calculated. The TVT values are a measure of vertical thickness and do not account for the structural dip of units encountered in the wellbore. The 15 stratigraphic horizons are the tops of 15 regional flooding surfaces F1-15. Net Sand was determined by normalizing gamma ray logs and using a cut-off of 85 API units and then summing each interval. For more detailed stratigraphic information, please see the associated...
In 2021 the United States Geological Survey (USGS) sampled the lower part of the Upper Cretaceous Lewis Shale in the eastern part of the Southwestern Wyoming Province to better characterize its petroleum source rock potential for an upcoming resource assessment. Ninety-five samples from 24 wells were collected from well cuttings of the lower part of the Lewis Shale stored at the U.S. Geological Survey Core Research Center in Lakewood, Colorado. The selected wells are located near the shallow margins of the basin to obtain samples that were not subjected to the effects of deep burial and subsequent organic carbon loss due to thermal maturation as described by Daly and Edman (1987) (fig, 1). The sample intervals were...
Categories: Data;
Tags: Asquith marker,
Colorado,
Energy Resources,
Great Divide Basin,
Great Divide Basin,
This child item contains one structural grid generated on the top of the Almond Formation (base Lewis Shale) and one grid on the top of the Fox Hills Sandstone. The top of the Lewis Shale and base of the Fox Hills Sandstone interfinger on a regional scale, so the top of the Fox Hills Sandstone was chosen as a structural horizon for consistency. The grids were generated by picking tops in borehole geophysical logs and interpolating between them in the Southwestern Wyoming Province in Wyoming and Colorado. The Lewis Shale in the eastern part of the province is bounded to the north and south by fault zones, to the east by uplift, and to the west by the Lewis stratigraphic pinch-out. The Lewis Shale has been uplifted...
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