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Quantitative reconstruction of pore-pressure history in sedimentary basins using fluid escape pipes

Joe Cartwright, Chris Kirkham, Martino Foschi, Neil Hodgson, Karyna Rodriguez and David James
Quantitative reconstruction of pore-pressure history in sedimentary basins using fluid escape pipes
Geology (Boulder) (January 2021) 49 (5): 576-580

Abstract

We present a novel method to reconstruct the pressure conditions responsible for the formation of fluid escape pipes in sedimentary basins. We analyzed the episodic venting of high-pressure fluids from the crests of a large anticlinal structure that formed off the coast of Lebanon in the past 1.7 m.y. In total, 21 fluid escape pipes formed at intervals of 50-100 k.y. and transected over 3 km of claystone and evaporite sealing units to reach the seabed. From fracture criteria obtained from nearby drilling, we calculated that overpressures in excess of 30 MPa were required for their formation, with pressure recharge of up to 2 MPa occurring after each pipe-forming event, resulting in a sawtooth pressure-time evolution. This pressure-time evolution is most easily explained by tectonic overpressuring due to active folding of the main source aquifer while in a confined geometry.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 49
Serial Issue: 5
Title: Quantitative reconstruction of pore-pressure history in sedimentary basins using fluid escape pipes
Affiliation: University of Oxford, Department of Earth Sciences, Oxford, United Kingdom
Pages: 576-580
Published: 20210112
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 28
Accession Number: 2021-074661
Categories: OceanographyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., strat. cols., geol. sketch map
N33°49'60" - N33°49'60", E34°30'00" - E34°30'00"
Secondary Affiliation: Searcher Seismic, Surrey, GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 202152
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