Structural Fabrics in Unconventional 'Mudrock' Reservoirs

Structural Fabrics in Unconventional 'Mudrock' Reservoirs

Abstract

                  The rapid expansion in exploration and development of fine-textured unconventional hydrocarbon reservoirs (siltstone, mudstone, shale: ‘mudrock’) has increased interest in the significance of several types of structural fabrics revealed by core examination.  The two main fabrics described here are designated ‘polished slip faces’ (PSF), typically with slickensides and ‘cleavage.’  These fabrics are being linked to higher production intervals in several formations in western Canada and Montana.  PSF and cleavage in variable frequency have been documented in Devonian, Mississippian, Triassic and Cretaceous rocks in the Western Canada Sedimentary Basin (WCSB), mainly in siliciclastic units, but also in limestones.  Occurrence of PSF and cleavage in the WCSB appears to be most common within 100 kms of the Foothills Deformed Belt, and to increase in frequency toward that structural margin.

Analysis of these structural fabrics provides insights into the subsurface stress regime, orientation of stresses, temperature exposure, degree of organic maturation, relationship to overpressuring, generation of bitumen/pyrobitumen, horizontal and oblique shear displacement associated fluid types and mineralization, timing of formation, and other products and processes.  Interest is driven by the possibility that these fabrics may play a role in decisions regarding orientation of horizontal drilling, and that they may influence orientation and behaviour of hydraulic fractures.  This talk summarizes some of the current (but still evoving) observations and interpretations of PSF and cleavage fabrics.

*Graham Davies Geological Consultants (GDGC) Ltd.

**Canadian Discovery Ltd.

 

Speaker David Hume, Canadian Discovery
Biography          Dave Hume is a professional geologist with 30 years of experience. He received his Bachelor of Science in Geology from the University of Alberta in 1982. His expertise straddles sedimentology, sequence stratigraphy and geological modeling as it relates to the development of exploration and development prospects.   Prior to ...

Biography         


Dave Hume is a professional geologist with 30 years of experience. He received his Bachelor of Science in Geology from the University of Alberta in 1982. His expertise straddles sedimentology, sequence stratigraphy and geological modeling as it relates to the development of exploration and development prospects.


 


Prior to joining Rakhit Petroleum Consulting Ltd. (RPCL) — the predecessor to Canadian Discovery Ltd. (CDL)—in 1990, Dave was the senior geologist of an intermediate oil and gas production company in Calgary, where he gained direct experience in exploration and development geology and oil and gas operations. Dave later left RPCL to work as the senior stratigrapher with Trident Exploration for a year, and subsequently rejoined CDL as Director of Consulting Services and Multi-Client Studies.


 


During his Tenure with RPCL/CDL Dave has authored or contributed to over 500 studies in North America, South America, the North Sea, Asia and the Middle East.  He has presented numerous papers to the CSPG, The AAPG, RMAG and the Geological Society in London. His current focus is a study of the oil potential of the Second White Specks Zone in the Colorado Group of the Upper Cretaceous

Full Description

When?

Tue, Nov. 19, 2013
11:30 a.m. - 1 p.m.
(GMT-0500) US/Central

Event has ended

Where?

Midland Center
105 N. Main Street
Midland, TX 79701