Data supporting a study using low-temperature hydrous pyrolysis as a method of determining the quantity and quality of oil retained in thermally mature, Mowry Shale, Powder River Basin, Wyoming

The Cretaceous Mowry Shale is a prolific source rock in numerous Laramide basins and operators have recently increased research activity testing the Mowry as an unconventional source-rock resevoir in the Powder River Basin (PRB). Despite this recent increase in research activity, much work remains on characterizing the quantity and quality of oil retained in thermally mature Mowry Shale in the PRB. There are several methods for determining the amount of oil retained in a thermally mature source-rock reservoir. These are typically based on pyrolysis methods that rely on thermovaporization or solvent extraction, which neither operate in the natural subsurface nor generate a natural oil-like product. Here, we explore low-temperature hydrous pyrolysis (LTHP) as a new method to test the quantity and quality of oil present in thermally mature source-rock reservoirs. The study includes four samples. LTHP was used on two core samples collected from the middle Mowry Shale and the other two natural oil samples included a conventionally produced oil (sample C4229) collected from the Muddy Sandstone in Carson Field and an unconventional Mowry-sourced oil (sample C4678) collected from a horizontal well in the Mowry Shale. Core and oil samples are all from Campbell and Sheridan counties, Wyoming, in the PRB. Data from the study is presented here as 4 tables in csv format. The first table, Sample Identification and Description.csv, contains sample identification and description information. The second table, LTHP Conditions and Yield.csv, contains the LTHP test conditions and yield results. The third table, Petrographic Analysis.csv, contains the vitrinite reflectance results from the petrographic analysis for the samples pre- and post- LTHP. The fourth table, Geochemical Screening.csv, contains the organic geochemical screening data, pre- and post- LTHP. And the final table, Gas Chromatography.csv, contains gas chromatography parameters from the LTHP and naturally occurring Mowry oils.