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Depositional, Diagenetic and Tectonic Complexity of the San Andres on the Central Basin Platform Bob Trentham CEED UTPB.

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Presentation on theme: "Depositional, Diagenetic and Tectonic Complexity of the San Andres on the Central Basin Platform Bob Trentham CEED UTPB."— Presentation transcript:

1 Depositional, Diagenetic and Tectonic Complexity of the San Andres on the Central Basin Platform Bob Trentham CEED UTPB

2 Problem Statement  The Guadalupian on the Central Basin Platform has produced more oil than any other reservoir in the Permian Basin (>3.5 BBO). However, percent recoveries from primary, secondary and tertiary methods is low (ranging from 11 to 50%).  In part, this is a function of a “postage stamp” mentality where workers, both geologists and engineers, become experts in particular fields.  This leads to an incomplete understanding of the regional which in turn reduces the potential for enhance reserve recovery.

3 Naming Convention  Holt on Central Basin Platform = Leonardian 7 and 8 of Kerans = lower Cutoff? Called lower SA1 and lower SA2 in 2002 Kerans CD.  McKnight = Guadalupian 1 & 2 (middle SADR1 and middle SADR2) in 2002 Kerans CD. Includes McKnight Shale that is probably middle SADR1 equivalent. Ward sees no major karst event at top of McKnight.  Intermediate = Guadalupian 3 & 4 (upper SADR1 & upper SADR 2) in 2002 Kerans CD. Brushy Canyon Bypass Surface = top Intermediate. Brushy Canyon = Guadalupian 5, 6 & 7 (BR 1, 2 & 3).  Judkins = Guadalupian 8 (upper SADR3) in 2002 Kerans CD. Major karst surface at top.  Post Judkins = Guadalupian 9 (upper SADR4) in 2002 Kerans CD. Major karst surface, base is Lovington Sand. Could be called Lovington Interval or Lovington Equivalent.

4 Kerans Trentham Ward Guad 2 middle SADR 2 McKnight P - 6 lower Pay Zones in Howard - Glasscock, Iatan, Diamond M, etc Guad 1 middle SADR 1 McKnight Shale P - 7 Leon 8lower SADR 2 Holt P - 8 SADR Leon 7lower SADR 1 Leon 6Glorieta 1 Glorieta San Angelo Lower San Andres

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7 Guad 8upper SADR 3 BR 4 Judkins Pi Marker P-1 P-2 P-3 Slaughter Cedar Lake, Welch, Moore, & SADR prod in Reagan Co. Guad 7 BR 3 Guad 6 BR 2 Guad 5 BR 1 Guad 4upper SADR 2 Intermediate P - 4 Guad 3upper SADR 1 P – 5 Middle San Andres

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10 Kerans(2001) Trentham/Ward (2002) Northwest ShelfEastern Shelf Guadalupe Mts., NW Shelf Del Basin Central Basin PlatformNMTXNE Midland Basin Guad 10 GRBG 1 CC 2 lower GRBG Premier Sand Guad 9 upper SADR 4 CC 1 Post Judkins Upper SADR Evaporitic Facies Non-deposited or Eroded Lovington Sand Upper San Andres

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13 The paradigm has been that all San Andres reservoirs on the Central Basin Platform “flood the same” and produce from the same rocks.

14 San Andres Structural History  on the platform has had a complex history including multiple karsting (Low Stand) events.  The San Andres on the platform has had a complex history including multiple karsting (Low Stand) events.  The model for San Andres deposition on the platform are the Guadalupe Mountain outcrops which were deposited in a tectonically passive environment.  However…..There is an middle to upper San Andres uplift of the southern end of the Central Basin Platform that is NOT seen in the Guadalupe Mts.  The San Andres varies from +/-600‘ to >1600’ on the platform both as a result of thickening toward the platform margins and thinning over pre-existing structures.

15 This Leads To:  In the southern portion of Crane Co. there are coal beds and reworked coals in the middle and upper San Andres.  The Penwell, Jordan, Waddell and Keystone Fields produce from upper San Andres on the flanks and middle San Andres on the crest of the structures.  McKnight (lower SADR) production, a major producing horizon in Sand Hills Field, may have been by passed in a number of fields.

16 San Andres Sub-Provinces   Uplift – Ft Stockton Uplift portion of CBP. Mostly in Pecos Co. 600 to 1000’ SADR.   Spine – north to south axis of CBP. Extends thru W. Crane, W. Ector, E. Ward, E. Winkler, W. Andrews, and E. Lea Counties. 800 – 1200’ SADR   Outboard - Eastern and Western margins of CBP, Crane, Ectro, Andres, Gaines, Ward, Winkler and Lea Counties   North and Northwest Shelves -. Northern Midland Basin Rim and Northwest Shelf of Delaware Basin to 1500’ SADR. Better analogs to Guadalupe Mts.   Ozona Arch - More deeply eroded than CBP. Possibly nearer to source of tectonism. 600 to 1100’ SADR.   Eastern Shelf – 0 to 800’. Close to source of tectonism.   Midland Basin – Mix of clastics and carbonates.

17 San Andres Sub-provinces

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19 I 20 CROSS SECTION H.S.A.JANELLPENWELLFOSTER LOVINGTON243 E 75 E E 250 JUDKINS E INTERMEDIATE McKNIGHT (+ Holt) TOTAL

20 San Andres Factoids  If >900’ Lovington may be present. ~~ 900’, Judkins, no Lovington.  If <600’, no Judkins.  Contour maps of GRBG and SADR production is from wells IP’d prior to The assumption is that these are natural, acid or nitro completions with no fracs.  T in the Foster area is +/- 1500’ thick. In the Penwell area, 15 miles to the southwest, the SADR is only ~800’ thick.  The San Andres in the Foster area is +/- 1500’ thick. In the Penwell area, 15 miles to the southwest, the SADR is only ~800’ thick.  The “boomer wells” (>10,000 BOPD) on the east flank of the McElroy Field are from karsted upper SADR.

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22 B B B B A B B C C C C C D D D D D 250 – 500 BOPD D C 500 – 1,000 BOPD B 1,000 – 5,000 BOPD A 5,000 – 10,000 BOPD B Waddell Penwelll Jordan Harper TXL Goldsmith Andector Lawson Donnelly E. Goldsmith Foster S Cowden N. & W. Goldsmith Emma Embar

23  San Andres production in Red overlain on Isopach  Note northwest to southeast trend of both isopach and production.  Note relationship between isopach thins and production  Western boundary of production is controlled by updip permeability barrier

24 Work to Date  7 cores 2 in Sand Hills; 2 in North Ward Estes; 3 in Foster-South Cowden  Cross section network in Crane Co.  Correlation of 100 wells in North Ward Estes area

25 Ector County San Andres Project  Correlate units within the San Andres in Ector County.  Create Cross section grid.  Delineate San Andres production by unit.  Evaluate depositional history and diagenetic overprint of the San Andres.  Generate isopach and structure maps of each San Andres unit.

26 Needed Resources  Digital Data – logs, bases, Scout info, seismic  Rock Data – Cores, samples from selected wells  Funding


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