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Title: Hydropressure tongues within regionally geopressured lower Tuscaloosa sandstone, Tuscaloosa trend, Louisiana

Abstract

A regional study of the Tuscaloosa Formation in Louisiana, undertaken to assess geopressured-geothermal potential, revealed lobate, downdip extensions of the hydropressured zone in lower Tuscaloosa massive sandstone facies below the regional top of geopressure. Normal pressure zones within geopressured section were identified by drilling-mud weights less than 13 lb/gal on electric logs of massive lower Tuscaloosa sandstone; cross section demonstrated updip continuity of these zones with the regional hydropressured zone. These hydropressure tongues are permitted by the anomalously high permeabilities reported from the deep Tuscaloosa trend, and they are attributed to both primary and secondary porosity by investigators of Tuscaloosa sandstone petrography. The hydropressure tongues correspond with lobes of thick net sandstone, principally in Pointe Coupee, East Felinicana, East Baton Rouge, and Livingston Parishes in the central Tuscaloosa trend. Limited control suggests at least one hydropressure tongue in the Chandeleur Sound area to the east. Dimensions of hydropressure tongues range up to 27 km (17 mi) parallel to srike and 17 km (11 mi) oblique to strike. In many places, tongues are terminated downdip by faults, which, by acting as pressure seals, prevent the tongues from extending to the downdip edge of the massive sandstone in the expanded sections ofmore » the downthrown blocks. The areal extent of geopressured Tuscaloosa sandstone is controlled updip by these fault zones, and downdip by pinch-out of the sandstone units basinward. Local hydropressure tongues diminish the geopressured-geothermal potential of the Tuscaloosa trend, but show no discernible relation to gas-productive areas.« less

Authors:
;
Publication Date:
Research Org.:
Louisiana Geological Survey, Baton Rouge
OSTI Identifier:
6802207
Report Number(s):
CONF-8310301-
Journal ID: CODEN: AAPGB
Resource Type:
Conference
Journal Name:
Am. Assoc. Pet. Geol., Bull.; (United States)
Additional Journal Information:
Journal Volume: 67:9; Conference: American Association of Petroleum Geologists eastern section meeting, Carbondale, IL, USA, 3 Oct 1983
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; 58 GEOSCIENCES; 03 NATURAL GAS; GEOPRESSURED SYSTEMS; GEOLOGY; LOUISIANA; DRILLING FLUIDS; ELECTRIC LOGGING; GEOLOGIC FAULTS; GEOTHERMAL SYSTEMS; PERMEABILITY; POROSITY; REGIONAL ANALYSIS; SANDSTONES; ENERGY SYSTEMS; FEDERAL REGION VI; FLUIDS; GEOLOGIC FRACTURES; GEOLOGIC STRUCTURES; NORTH AMERICA; ROCKS; SEDIMENTARY ROCKS; USA; WELL LOGGING; 150201* - Geology & Hydrology of Geothermal Systems- USA- (-1989); 580100 - Geology & Hydrology- (-1989); 030300 - Natural Gas- Drilling, Production, & Processing

Citation Formats

McCulloh, R P, and Purcell, M D. Hydropressure tongues within regionally geopressured lower Tuscaloosa sandstone, Tuscaloosa trend, Louisiana. United States: N. p., 1983. Web.
McCulloh, R P, & Purcell, M D. Hydropressure tongues within regionally geopressured lower Tuscaloosa sandstone, Tuscaloosa trend, Louisiana. United States.
McCulloh, R P, and Purcell, M D. Thu . "Hydropressure tongues within regionally geopressured lower Tuscaloosa sandstone, Tuscaloosa trend, Louisiana". United States.
@article{osti_6802207,
title = {Hydropressure tongues within regionally geopressured lower Tuscaloosa sandstone, Tuscaloosa trend, Louisiana},
author = {McCulloh, R P and Purcell, M D},
abstractNote = {A regional study of the Tuscaloosa Formation in Louisiana, undertaken to assess geopressured-geothermal potential, revealed lobate, downdip extensions of the hydropressured zone in lower Tuscaloosa massive sandstone facies below the regional top of geopressure. Normal pressure zones within geopressured section were identified by drilling-mud weights less than 13 lb/gal on electric logs of massive lower Tuscaloosa sandstone; cross section demonstrated updip continuity of these zones with the regional hydropressured zone. These hydropressure tongues are permitted by the anomalously high permeabilities reported from the deep Tuscaloosa trend, and they are attributed to both primary and secondary porosity by investigators of Tuscaloosa sandstone petrography. The hydropressure tongues correspond with lobes of thick net sandstone, principally in Pointe Coupee, East Felinicana, East Baton Rouge, and Livingston Parishes in the central Tuscaloosa trend. Limited control suggests at least one hydropressure tongue in the Chandeleur Sound area to the east. Dimensions of hydropressure tongues range up to 27 km (17 mi) parallel to srike and 17 km (11 mi) oblique to strike. In many places, tongues are terminated downdip by faults, which, by acting as pressure seals, prevent the tongues from extending to the downdip edge of the massive sandstone in the expanded sections of the downthrown blocks. The areal extent of geopressured Tuscaloosa sandstone is controlled updip by these fault zones, and downdip by pinch-out of the sandstone units basinward. Local hydropressure tongues diminish the geopressured-geothermal potential of the Tuscaloosa trend, but show no discernible relation to gas-productive areas.},
doi = {},
url = {https://www.osti.gov/biblio/6802207}, journal = {Am. Assoc. Pet. Geol., Bull.; (United States)},
number = ,
volume = 67:9,
place = {United States},
year = {1983},
month = {9}
}

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