Item talk:Q303455

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   "@type": "Article",
   "additionalType": "Journal Article",
   "name": "Multimineral petrophysics of thermally immature Eagle Ford Group and Cretaceous mudstones, U.S. Geological Survey Gulf Coast 1 research wellbore in central Texas",
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       "value": "10.1190/INT-2021-0094.1",
       "url": "https://doi.org/10.1190/INT-2021-0094.1"
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   "journal": {
     "@type": "Periodical",
     "name": "Interpretation",
     "volumeNumber": "10",
     "issueNumber": "1"
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   "datePublished": "2022",
   "dateModified": "2022-02-18",
   "abstract": "Traditional petrophysical methods to evaluate organic richness and mineralogy using gamma-ray and resistivity log responses are not diagnostic in source rocks. We have developed a deterministic, nonproprietary method to quantify formation variability in total organic carbon (TOC) and three key mudrock mineralogical components of nonhydrocarbon-bearing source rock strata of the Eagle Ford Group by developing a set of log-derived multimineral models calibrated with Fourier transform infrared spectroscopy core data from the research borehole U.S. Geological Survey Gulf Coast 1 West Woodway. We determined that bulk density response is a reliable indicator of organic content in these thermally immature, water-bearing source rocks. Multimineral findings indicate that a high degree of laminae-scale mineralogical heterogeneity exists due to thinly interbedded carbonate cements amid clay-rich mudstone layers. The lower part of the Eagle Ford Group contains the highest average TOC content (4.7\u00a0wt%) and the highest average carbonate volume (64.1\u00a0vol%), making it the optimal target in thermally mature areas for source-rock potential and hydraulic-fracture placement. In contrast, the uppermost portion of the Eagle Ford Group contains the highest average volume of clay minerals (42.6\u00a0vol%), which increases the potential for wellbore stability issues. Petrophysical characterization reveals that porosity is approximately 30% in this relatively uncompacted formation. In this thermally immature source rock, water saturation is nearly 100% and no free hydrocarbons were observed on the resistivity logs. No evidence of borehole ellipticity was observed on the three-arm caliper log, and horizontal stresses are presumed to be directionally uniform in the vicinity of this near-surface wellbore. This shallow wellbore has a temperature gradient of 1.87\u00b0F/100\u00a0ft (16.3\u00b0C/km) and is likely influenced by earth surface heating.",
   "description": "15 p.",
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       "name": "Birdwell, Justin E. jbirdwell@usgs.gov",
       "givenName": "Justin E.",
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           "name": "Southwest Climate Science Center",
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       "name": "Burke, Lauri A. lburke@usgs.gov",
       "givenName": "Lauri A.",
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