Wolfcamp Upper A Fan Study

LOWER ZONE WOLFCAMP UPPER A MIDDLE ZONE UPPER ZONE HEB FACIES AAPG ACE2019 ANNUAL CONVENTION & EXHIBITION 19 22 May. San Antonio, Texas Fig 128 Fig 19 Fig 17 Fig 10 Core B Lateral Fringe GAMMA-RAY (API) 250 100 ft 33 m Core A Off-Axis GAMMA-RAY (API) single HEB 250 wwwwww Fig &C Fig 14A Fig 134 Fig 148 ■Fig 138 Packstone (PS/SLC/SLcl) Calcareous argillaceous siltstone (SLca) Calcareous silty mudstone (Mcs) Mudstone (Mm) Fig &A Wolfcamp fan facies summary Core C Distal Fringe GAMMA-RAY Lateral Fringe Ws -Mcs, Mm (API) 0 250 Fig 18A Fig 114 Fig 118 Fig 188 Fig &8 Distal Fringe Axis to Off-Axis Ps PC (CRF-rich) PC (Mudstone, clast-rich) SLca Mcs,Mm Ps PC (CRF-rich) Ws Mcs, Mm SLca PC (CRF-rich) Ps Lateral Fringe Core B Off-Axis Core A Abrupt fransition of facies Gradual transition of facies Frontal Fringe Distal Fringe Axis Frontal to Distal Fringe Lateral Fringe Ws Mcs, Mm, Mmx Core C Ps SLca Ps Axis to Off-Axis (core A) - Dominated by paraconglomerates (Pc) (debrites) - Debrites can be carbonate- or mudstone-clast rich - Relatively minor HEBS Turbidites are rare! Lateral Fringe (core B) Abundant wackestones (Ws) (muddy debrites) Debrites are rheologically stratified (linked Pc and Ws) - Fewer beds of Pc - Increase in mud- dominated HEBS over Off-axis core Frontal to Distal Fringe Dominated by HEBS Debrites are thin and uncommon - Bioturbation more Fig 16A Fig 168 Fig 16C Fig 12A ■ Fig 15 DEBRITE FACIES Paraconglomerate (Pc) Wackestone (Ws) Bioturbated mudstone (Mmx/Mdx) Bone Spring Fm. sands and silts From Kvale et al., in press, Facies variability within a mixed carbonate-siliciclastic sea-floor fan (upper Wolfcamp Fm., Permian, Delaware Basin, New Mexico). AAPG Bull. devon common

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