Event details

May 11, 2021 WTGS Luncheon Meeting

  • May 11, 2021
  • 11:30 AM - 1:00 PM
  • Bush Convention Center
  • 79

Registration


Register

This meeting will be held at the Bush Convention Center.  Please register by 3pm Friday, May 7th. Luncheon charge is $25 for pre registration and $35 for onsite.  Please note that there will be limited seating and food for those not pre-registered.  Please register on the website, by email wtgs@wtgs.org by by phone 432.683.1573.

Where’s the Beef – Calcite Beef?

Robert F. Lindsay

Lindsay Consulting & Brigham Young University

Midland, Texas and Provo, Utah

Cores of Barnett and Wolfcamp unconventional source rock were found to contain calcite beef that emplaced into horizontally-oriented (dominate) and vertically-oriented (subordinate) fractures. Calcite beef emplacement was by a minimum of two phases of horizontal-oriented hydraulic fracturing, followed by an additional vertically-oriented phase of emplacement.

Classic calcite beef refers to fibrous minerals in bedding-parallel veins, where fibers are perpendicular to margins. In this case, beef has been found to be white fibrous to equant calcite cement, all part of the same emplacement process.

Petrography of horizontal-oriented fractures containing calcite beef suggest forceful compressional injection into weak, ductile, mud-rich, source rock laminae. Calcite beef filled fractures are horizontal to slightly inclined and subtly crosscut source rock laminae. Breccia fragments of source rock float between fibrous calcite beef that grew vertically up and down, perpendicular to fractures. Calcite beef is interpreted to have precipitated so quick that breccia fragments did not have an opportunity to settle to the floor of the fracture.

Petrography of vertical-oriented fractures containing calcite beef suggest emplacement via transtension. Vertical-oriented fractures at first glance appear linear, but upon closer examination contain sinuous vertical-oriented micro-stylolites. Micro-stylolites are indicative of compression and/or transtension.

Preliminary data suggest that horizontal and vertical fractures, containing calcite beef, were emplaced by compressional re-activation of pre-existing faults/fractures during latest phases of Laramide orogeny (horizontal fractures) and during transtension associated with Rio Grande rifting (vertical fractures). In either case fault/fracture movement created forceful injection of fluids into source rock laminae. This injection process is referred to as seismic pumping.

Fluid inclusions from calcite beef in Wolfcamp shale contained only hydrocarbon inclusions. However, fluid inclusions from calcite beef in Barnett shale contain both hydrocarbon and aqueous inclusions. Aqueous inclusions are composed of fresh water (<10,000 ppm), with homogenization temperatures of 148° C. Surprisingly, these salinities and homogenization temperatures are similar to fluid inclusions associated with residual oil zone (ROZ) ramp/shelf margin plays throughout the Permian Basin.

This data suggests that during development of the Southern Rocky Mountain Epeirogen, during Late Eocene-Early Miocene, hot, high pressure, high volume meteoric recharge not only swept Permian Basin ramp/shelf porosity fairways, to form ROZ’s, but also swept down-dip through debris flows connected to ramp/shelf margins and charged open fault/fracture systems. This process connected: 1) ramp/shelf porosity fairways; 2) basin debris flows; and 3) faults/fractures as an open system.

Source rock strata where calcite beef was emplaced behaved as weak strata, which preferentially hydraulically fractured horizontally and vertically in mud-rich lithofacies. Surprisingly, no calcite beef emplaced into brittle debris flows, grain flows, or silt flows.

BIO:

Born and raised in Utah (United States)

  • Served in U.S. Army Special Forces, known by their nick name “The Green Berets”
  • Graduated from:Weber State College 1974 – B.Sc. Geology Brigham Young University 1976 – M.Sc. Geology

University of Aberdeen 2014 – Ph.D. in Geology

Bob has worked for:

  1. Gulf Oil, 1976-1985, Production Geology, Enhanced Oil Recovery (Supervisor EOR Geology), and Applied Research
  2. Chevron, 1985-2001, Carbonate Petrographer, Laboratory Supervisor, and Stratigrapher
  3. ChevronTexaco, 2001-2002, Carbonate Specialist
  4. Saudi Aramco, 2002-2015, Geological Specialist, Geological Consultant, Sr. Geological Consultant (Geological Technical Services Division), Carbonate Sedimentology and Sequence Stratigraphy, leading Aramco carbonate field trips and teaching graduate level carbonate sedimentology at King Faud University of Petroleum and Minerals (KFUPM)
  5. Lindsay Consulting LLC & Affiliated Faculty Brigham Young University, 2015-Present, Consulting on Permian Basin oil fields, leading field trips, teaching graduate level course “Rock-based Integrated Reservoir Characterization” and short courses

Bob has served as:

  1. Editor for Oklahoma City Geological Society (1980-1982)
  2. Co-chairman and Chairman SEPM Evaporite Research Group (1984-1986)
  3. A Distinguished Lecturer (1993-1994) American Association of Petroleum Geologists
  4. President Permian Basin Section – SEPM (1994-1995)
  5. President West Texas Geological Society (2000-2001)
  6. Executive Committee Member – Dhahran Geoscience Society (2005-2007)
  7. Distinguished Lecturer (2013-2014) Dhahran Geoscience Society

He has published 104 abstracts and papers

Bob spends his retirement time giving back to academia and industry by:

  1. Running field trips, giving talks and teaching short courses for geological societies, universities and industry
  2. Teaching at Brigham Young University

  • Home
  • May 11, 2021 WTGS Luncheon Meeting


© West Texas Geological Society

Powered by Wild Apricot Membership Software