PBS-SEPM November, 2016 Luncheon Meeting

“Natural Fracture Systems in the Spraberry Formation, Permian Basin”

Tuesday, November 15th, 2016 – Midland College Carrasco Room 11:30am

 

Abstract

Engineering tests in the 1950s and 1960s showed that Spraberry reservoirs in the Permian basin of West Texas generally have a strong, fracture-controlled, NE-SW maximum horizontal permeability trend, but fracture data from vertical and horizontal cores show that the Spraberry natural-fracture system has remarkable variability. Fracture patterns change both vertically and laterally, and fracture permeability is dynamic, changing with variations in reservoir pressure. Horizontal core from a US DOE project in the 1990s showed that at one location, the 1U Spraberry sandstone contains a partially mineralized, NE-SW striking set of extension fractures, where only 140 ft below, the 5U Spraberry sandstone contains a conjugate pair of NNE-SSW and ENE-WSW striking, un-mineralized, minimal-displacement, strike-slip shear fractures. Engineering tests indicate that units containing the conjugate fractures have less anisotropic drainage than units containing the set of parallel extension fractures. Moreover, they demonstrated that fracturecontrolled permeability increased, and unexpected off-trend interference occurred, during injection into the underpressured reservoirs. Core from the interbedded shales is also naturally fractured but more heavily near the bottom than at the top of the shale beds. Examination of the natural fracture populations in more recent horizontal and vertical Spraberry cores has reinforced the conceptual model of strain partitioning, where extension fractures in one reservoir can be dynamically compatible with shear fractures in adjacent reservoirs. Parallel shear fractures can also form in isolation where a fault acts in place of the complimentary shear set of the ideal conjugate pair.

Reservations are $20 per person.  Please make your reservation no later than Friday, November 11th.  No online registration at this time, but please leave a voice mail at 432.279.1360 or email info@pbs-sepm.org.

Speaker: Dr. John C. Lorenz
Speaker Dr. John C. Lorenz
  Bio John has a background in, and has published on, sedimentology stratigraphy, but for the last 31 years has focused on the origins, characteristics, and effects of natural fractures in hydrocarbon reservoirs. He has studied the interactions of fractures and in situ stresses in reservoirs on the North Slope ...

 


Bio


John has a background in, and has published on, sedimentology stratigraphy, but for the last 31 years has focused on the origins, characteristics, and effects of natural fractures in hydrocarbon reservoirs. He has studied the interactions of fractures and in situ stresses in reservoirs on the North Slope of Alaska to North Africa, and points in between. John received a Ph.D. from Princeton University in 1981, and worked for Sandia National Laboratories in Albuquerque, NM (USA) for 26 years before becoming a consultant. He has been the Elected Editor of the American Association of Petroleum Geologists (2001-2004), and was the 2009-2010 President of AAPG

Full Description
Organizer PBS-SEPM

When?

Tue, Nov. 15, 2016
11:30 a.m. - 1 p.m.
(GMT-0500) US/Central

Where?

Carrasco Room Midland College
3600 N. Garfield
Midland, TX 79705
United States