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Title: A regional subsurface study of the expanded Yegua Formation in the Houston Embayment of the upper Texas Gulf Coast

Abstract

The Eocene Yegua Formation, one of a series of Tertiary clastic wedges, thickened significantly basinward of the platform margin as it prograded across the Houston diapir province of southeastern Texas. Sandstones of the expanded Yegua represent neritic, distal mouth-bar and shelf environments downdip from the strandline. Structural movements (growth faulting and salt diapirism) were contemporaneous with deposition and exerted a strong influence on patterns of sand dispersal, while sedimentation in turn mobilized the underlying salts and triggered faulting over the unstable shelf edge. Major depocenters became established along strike-parallel growth faults, sourced by dip-oriented feeder systems from the northwestern shelf. The faults, which trend northeast through Liberty and Hardin counties, served to localize thicker sand sections on their downthrown side. Salt diapirism created a major depocenter over a large withdrawal syncline in south-central Liberty County, assumed to be the source for most piercement features in the study area. Thick sand sections also accumulated in other low areas due to salt withdrawal or sediment loading and to damming behind growing domes. In contrast, salt domes and ridges were generally positive topographic highs, which channeled sand into interdomal conduits. Diapirism has therefore compartmentalized the depocenters. Multiple Yegua sandstones now occur in severalmore » favorable structural positions (especially along the shelf-edge growth faults and over the central salt-withdrawal syncline), and these areas of thick sand accumulation constitute primary targets for petroleum exploration.« less

Authors:
 [1];  [2]
  1. CNG Producing Co., New Orleans, LA (United States)
  2. West Virginia Univ., Morgantown, WV (United States)
Publication Date:
OSTI Identifier:
96229
Report Number(s):
CONF-941065-
Journal ID: AABUD2; ISSN 0149-1423; TRN: 95:005100-0033
Resource Type:
Journal Article
Journal Name:
AAPG Bulletin
Additional Journal Information:
Journal Volume: 78; Journal Issue: 9; Conference: 44. annual convention of the Gulf Coast Association of Geological Societies and the 41st annual convention of the Gulf Coast Section of the Society of Economic Paleontologists and Mineralogists, Austin, TX (United States), 5-7 Oct 1994; Other Information: PBD: Sep 1994
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; US GULF COAST; PETROLEUM DEPOSITS; SALT DEPOSITS; EXPLORATION; RESERVOIR ROCK; GEOMETRY; SEDIMENTATION; EOCENE EPOCH; TEXAS; SANDSTONES; GEOLOGIC FAULTS

Citation Formats

Goings, R E, and Smosna, R. A regional subsurface study of the expanded Yegua Formation in the Houston Embayment of the upper Texas Gulf Coast. United States: N. p., 1994. Web.
Goings, R E, & Smosna, R. A regional subsurface study of the expanded Yegua Formation in the Houston Embayment of the upper Texas Gulf Coast. United States.
Goings, R E, and Smosna, R. 1994. "A regional subsurface study of the expanded Yegua Formation in the Houston Embayment of the upper Texas Gulf Coast". United States.
@article{osti_96229,
title = {A regional subsurface study of the expanded Yegua Formation in the Houston Embayment of the upper Texas Gulf Coast},
author = {Goings, R E and Smosna, R},
abstractNote = {The Eocene Yegua Formation, one of a series of Tertiary clastic wedges, thickened significantly basinward of the platform margin as it prograded across the Houston diapir province of southeastern Texas. Sandstones of the expanded Yegua represent neritic, distal mouth-bar and shelf environments downdip from the strandline. Structural movements (growth faulting and salt diapirism) were contemporaneous with deposition and exerted a strong influence on patterns of sand dispersal, while sedimentation in turn mobilized the underlying salts and triggered faulting over the unstable shelf edge. Major depocenters became established along strike-parallel growth faults, sourced by dip-oriented feeder systems from the northwestern shelf. The faults, which trend northeast through Liberty and Hardin counties, served to localize thicker sand sections on their downthrown side. Salt diapirism created a major depocenter over a large withdrawal syncline in south-central Liberty County, assumed to be the source for most piercement features in the study area. Thick sand sections also accumulated in other low areas due to salt withdrawal or sediment loading and to damming behind growing domes. In contrast, salt domes and ridges were generally positive topographic highs, which channeled sand into interdomal conduits. Diapirism has therefore compartmentalized the depocenters. Multiple Yegua sandstones now occur in several favorable structural positions (especially along the shelf-edge growth faults and over the central salt-withdrawal syncline), and these areas of thick sand accumulation constitute primary targets for petroleum exploration.},
doi = {},
url = {https://www.osti.gov/biblio/96229}, journal = {AAPG Bulletin},
number = 9,
volume = 78,
place = {United States},
year = {1994},
month = {9}
}