Wolfcamp Upper A Fan Study

AAPG ACE2019 ANNUAL CONVENTION & EXHIBITION 19 22 May. San Antonio, Texas cm to meters inches to feet Idealised Wolfcamp HEB Clay and CO3% 0- TOC % Porosity% 100% 05 0 12 HEB Divisions H5-Structureless to faintly laminated organic siliceous mudstone, common plant fronds H3 upper-Structureless calcareous silty mudstone, organic-rich with occasional plant fronds and uncommon sheared dewatering structures H3 lower - Calcareous argillaceous siltstone with clotted texture and dewatering pipes; isolated dark gray mudstone clasts sometimes present H2 Alternating lighter and darker bands of packstone and silty wackestone H1- Structureless to laminated bioclastic packstone, isolated dark gray mudstone clasts common, occasional dish structures at the top Frontal to distal fringe - Dominated by mixed carbonate-siliciclastic hybrid event beds (HEBs); exhibit features very similar to siliciclastic HEBS Interpretation WFCP Facies Suspension fallout and/or hemipelagic settling Mm A B Cohesive flow with general absence of elutriation features Mcs Mm Mm (H5) Cohesive flow with sand-silt concentrations from dewatering and elutriation coupled with internal shearing from within unit (H5) Mcs SLca Mcs (H3u)_ (H3u)_ Transitional flow with turbulence suppression SLcl SLca (H31) SLca Progressive aggradation beneath turbidity current Ps/SLC (H31) Average Percent Hybrid Facies Dry, Pres Decay Facies Beds Code Clay Calcite Mudstone, dolomitic, bioturb. Mdx 17.2 3.0 Mudstone, massive, laminated H5 Mm 36.1 1.0 2.8 Mudstone, calc, silty/sandy H3U Mcs 24.6 18.9 3.8 Dolomite Other TOC 28.6 51.0 1.5 60.1 4.5 52.7 2.7 Perm mD Dry Helium Porosity SLcl (H2) 0.00223 6.3 Siltstone, calcareous, argillac. H3L Siltstone, calcareous/laminated H2 Packstone H1 SLca 22.3 22.0 SLcl 8.0 Ps/SLc 3.5 4.6 50.4 4.6 51.1 2.6 36.6 1.6 0.00289 0.00231 0.00240 10.6 8.1 Ps 6.9 (H1) 0.00096 5.0 72.0 1.5 23.0 0.9 2.3 From Kvale et al., in press, AAPG Bull. Germaropteris martinsii ייד 1 inch/ 2.5 cm 0.1 ft / 3 cm SLcl (H2)_ Ps (H1) Red circles indicate carbonate "coatings" that formed around terrestrial plant leaves 0.2 ft / 6 cm

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