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Benjamin G Johnson


Email: bjohnson@usgs.gov
Office Phone: 303-236-7500
ORCID: 0000-0002-9462-9322
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Paleo-water depth is an important component of modeling surface temperatures through time. Paleo-water depth values represent the elevation of the sediment-water interface relative to global mean sea level at a particular point in geologic time. In most of the model time steps, paleo-water depth values were treated uniformly (single value) across the modeled area of interest, as a simplifying assumption. Most of the model layers were deposited in marine conditions, where the sediment-water interface was below mean sea level (positive paleo-water depths); however, the ground surface of the Williston Basin is now several thousand feet above sea-level, and the Cenozoic model layers were likely deposited in continental...
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The stratigraphic horizon grids were generated by picking formation tops in 16,200 borehole geophysical logs and interpolating between them in the Williston Basin of North Dakota, South Dakota, and Montana. Collectively, the horizon grids outline the structural framework of the Williston Basin from the ground surface to the crystalline basement. The grids define the boundary surfaces between geologic layers in the 3D petroleum systems model. Not every horizon in the petroleum systems model, however, ties to a specific interpreted set of formation tops (see the ‘Williston_Basin_data_overview.csv’ table to see which horizons were derived from interpreted formation tops). Some horizons were split/calculated to accommodate...
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These data tables describe observations made on borehole geophysical logs from 16,200 wells in the Williston Basin. It includes detailed surface hole locations, true vertical depths of formation tops, and true vertical thickness values between formation tops. The data contained in the “Williston_Basin_well_data.csv” table was used in generating the formation top shapefiles (“Formation top shapefile points for the 3D petroleum systems model of the Williston Basin, USA” child item) and the true vertical thickness shapefiles (“True vertical thickness shapefile points for the 3D petroleum systems model of the Williston Basin, USA” child item). A data glossary that describes the columns in the “Williston_Basin_well_data.csv”...
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This describes 28 thickness point shapefiles that represent true vertical thickness (TVT) values by calculating the difference between stratigraphically adjacent formation tops picked on borehole geophysical logs. In wells where adjacent formation tops 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. In total, the dataset contains 115,789 TVT values calculated in 16,200 wells from the Williston Basin of North Dakota, South Dakota, and Montana. This is a child item of a larger data release titled "Data release for the 3D petroleum systems model of the Williston Basin, USA".
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Basal heat flow from the crystalline basement and lithospheric mantle into the sedimentary column is a required boundary condition in the petroleum systems model. The model uses two basal heat flow conditions that are described using two ASCII grids that show map variations in heat flow (mW/m2). The “BHF000_BasalHeatFlow_Calib.asc” grid describes the modern-day basal heat flow calibrated to, and derived from subsurface temperature data, including 24 high-resolution static temperature logs from the North Dakota Geological Survey and a large proprietary dataset (>1,000) of drill stem test (DST) and bottom hole temperatures (BHT) from boreholes throughout Montana and North Dakota provided by IHS Markit ® (2022). This...
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