Visualizing Precambrian basement tectonics beneath a carbon capture and storage site, Illinois Basin

Characterization of Precambrian basement tectonics using 3D reflection seismology is critical for fully constraining the geology of a carbon capture and storage (CCS) site. Our study applied state-of-the-art visualization and attribute analysis to a 3D seismic volume of the basement complex that und... Full description

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Bibliographic Details
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doi: 10.1190/INT-2017-0116.1
Authors:McBride, J.H.; Keach, R.W., II; Leetaru, H.E.; Smith, K.M.
Volume Title:Interpretation (Tulsa)
Source:Interpretation (Tulsa), 6(2), p.T257-T270. Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States. ISSN: 2324-8858
Publication Date:2018
Note:In English. 75 refs.; illus., incl. block diags., geol. sketch maps
Subjects:Amplitude; Basement tectonics; Cambrian; Carbon dioxide; Carbon sequestration; Carbonate rocks; Characterization; Clastic rocks; Cores; Dip; Discontinuities; Eau Claire Formation; Elastic waves; Engineering properties; Epeirogeny; Faults; Flexure; Focus; Folds; Geophysical methods; Geophysical profiles; Geophysical surveys; Granites; Granodiorites; Igneous rocks; Intrusions; Limestone; Mapping; Metamorphic rocks; Metasedimentary rocks; Metavolcanic rocks; Models; Mount Simon Sandstone; Observations; Paleozoic; Permeability; Plutonic rocks; Pore pressure; Precambrian; Reflection methods; Rhyolites; Sedimentary rocks; Seismic attributes; Seismic methods; Seismic profiles; Seismicity; Shale; Sills; Siltstone; Stress; Strike; Surveys; Tectonics; Three-dimensional models; Traveltime; Upper Cambrian; Velocity; Visualization; Volcanic rocks; Illinois Basin; United States; Illinois Basin-Decatur Project
Coordinates:N394500 N400000 W0884000 W0890000
Record ID:2019006587
Copyright Information:GeoRef, Copyright 2020 American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States, Reference includes data supplied by Society of Exploration Geophysicists
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Description
Characterization of Precambrian basement tectonics using 3D reflection seismology is critical for fully constraining the geology of a carbon capture and storage (CCS) site. Our study applied state-of-the-art visualization and attribute analysis to a 3D seismic volume of the basement complex that underlies the Illinois Basin-Decatur Project CCS site. The most successful interpretative techniques used include geobody analysis, x (east-west, crossline)-directed amplitude change, and corendering (e.g., amplitude with semblance), integrated with gradient analysis. The 3D volume reveals a strong reflector deep within the basement complex that is interpreted to be a mafic sill, disrupted by a coherent pattern of prominent structural discontinuities. The discontinuities, which have a mutually orthogonal northwest-northeast trend, could have formed as part of the intrusion process, as tectonic faults, or a combination of both processes. Our preferred interpretation is that discontinuities are small faults with varying senses of offset. The most prominent of these is a narrow, well-defined northwest-striking crest or flexure in the igneous sill reflector. Injection-induced microseismicity describes a conspicuous pattern of northeast-trending clusters of events, some of which nucleated in the uppermost part of the basement, directly over this crest. This distribution of seismic events is proposed to be controlled, in part, by fracture zones related to the crest and associated discontinuities in the mafic sill. These fractures would be oriented in directions to be critically stressed, resulting in aligned microseismicity following pore pressure increases.