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Title: Depositional environment of downdip Yegua (Eocene) sandstones, Jackson County, Texas

Abstract

Yegua sandstones at a depth of 8300-8580 ft (2530-2615 m) were partly cored in the Arco Jansky 1 dry hole. Total thickness of the sandstone section is approximately 240 ft (73 m). The sandstones are enclosed in thick marine shales and are about 20 mi (32 km) downdip from thicker and more abundant sandstones in the Yegua Formation. The section is similar to reservoirs recently discovered in the area at the Toro Grande (1984), Lost Bridge (1984), and El Torito (1985) fields. The sandstones are fine to very fine grained and occur in thin beds that are 0.5-9 ft (0.15-2.7 m) thick. Sedimentary structures within the beds range from a lower massive division to a laminated or rippled upper division. Grain size within beds fines upward from 0.18 mm at the base to 0.05 mm at the top. The sandstones are interpreted to be turbidites of the AB type that were deposited within channels. The sandstones contain an average of 50% quartz and are classified as volcanic-arenites to feldspathic litharenites. Carbonate cement ranges from 0 to 27%. Average porosity is 29% and permeabilities are in the range of 60-1600 md in the clean sandstones. Much of the porosity is secondarymore » and is the result of the dissolution of cements, volcanic rock fragments, and feldspar grains. Yegua sandstones produce gas and condensate at nearby Toro Grande field on a gentle, faulted anticline. The local trend of reservoir sandstones may be controlled in part by faulting that was contemporaneous with deposition.« less

Authors:
;
Publication Date:
Research Org.:
Texas A and M Univ., College Station
OSTI Identifier:
5907482
Alternate Identifier(s):
OSTI ID: 5907482
Report Number(s):
CONF-8710198-
Journal ID: CODEN: AABUD
Resource Type:
Conference
Resource Relation:
Journal Name: AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States); Journal Volume: 71:9; Conference: Gulf-Coast Association of the Geological Society and Gulf-Coast Section SEPM meeting, San Antonio, TX, USA, 28 Oct 1987
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; NATURAL GAS DEPOSITS; RESERVOIR ROCK; PETROLEUM DEPOSITS; DEPOSITION; TEXAS; ALLUVIAL DEPOSITS; ANTICLINES; GEOLOGIC FORMATIONS; GEOLOGIC TRAPS; POROSITY; SANDSTONES; TERTIARY PERIOD; CENOZOIC ERA; FEDERAL REGION VI; GEOLOGIC AGES; GEOLOGIC DEPOSITS; GEOLOGIC STRUCTURES; MINERAL RESOURCES; NORTH AMERICA; RESOURCES; ROCKS; SEDIMENTARY ROCKS; USA 020200* -- Petroleum-- Reserves, Geology, & Exploration

Citation Formats

Whitten, C.J., and Berg, R.R. Depositional environment of downdip Yegua (Eocene) sandstones, Jackson County, Texas. United States: N. p., 1987. Web.
Whitten, C.J., & Berg, R.R. Depositional environment of downdip Yegua (Eocene) sandstones, Jackson County, Texas. United States.
Whitten, C.J., and Berg, R.R. Tue . "Depositional environment of downdip Yegua (Eocene) sandstones, Jackson County, Texas". United States.
@article{osti_5907482,
title = {Depositional environment of downdip Yegua (Eocene) sandstones, Jackson County, Texas},
author = {Whitten, C.J. and Berg, R.R.},
abstractNote = {Yegua sandstones at a depth of 8300-8580 ft (2530-2615 m) were partly cored in the Arco Jansky 1 dry hole. Total thickness of the sandstone section is approximately 240 ft (73 m). The sandstones are enclosed in thick marine shales and are about 20 mi (32 km) downdip from thicker and more abundant sandstones in the Yegua Formation. The section is similar to reservoirs recently discovered in the area at the Toro Grande (1984), Lost Bridge (1984), and El Torito (1985) fields. The sandstones are fine to very fine grained and occur in thin beds that are 0.5-9 ft (0.15-2.7 m) thick. Sedimentary structures within the beds range from a lower massive division to a laminated or rippled upper division. Grain size within beds fines upward from 0.18 mm at the base to 0.05 mm at the top. The sandstones are interpreted to be turbidites of the AB type that were deposited within channels. The sandstones contain an average of 50% quartz and are classified as volcanic-arenites to feldspathic litharenites. Carbonate cement ranges from 0 to 27%. Average porosity is 29% and permeabilities are in the range of 60-1600 md in the clean sandstones. Much of the porosity is secondary and is the result of the dissolution of cements, volcanic rock fragments, and feldspar grains. Yegua sandstones produce gas and condensate at nearby Toro Grande field on a gentle, faulted anticline. The local trend of reservoir sandstones may be controlled in part by faulting that was contemporaneous with deposition.},
doi = {},
journal = {AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)},
number = ,
volume = 71:9,
place = {United States},
year = {Tue Sep 01 00:00:00 EDT 1987},
month = {Tue Sep 01 00:00:00 EDT 1987}
}

Conference:
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