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Coastal & Marine Geology Program >Subsidence and Fault Activation . . . > Open File Report 01-274

Shallow Stratigraphic Evidence of Subsidence and Faulting Induced by Hydrocarbon Production in Coastal Southeast Texas

USGS Open File Report 01-274

Robert A. Morton, Noreen A. Purcell, and Russell L. Peterson

Contents:
Summary
Introduction
Geology & Production Histories
Sediment-Surface Profiles
Sediment Cores
Results
Coastal Environmental Implications
References
Appendix A
Appendix B
Project Contact:
Bob Morton

Appendix B: Core Descriptions

Appendix B: Core Descriptions
Port Neches Cores - BH-00-01 |BH-00-02 |BH-00-03 |BH-00-04 |BH-00-05 |BH-00-06
Caplen Field Cores - COF-00-01 |COF-00-02 |COF-00-03 |COF-00-04

Core BH-00-04
Core BH-00-04
[larger image 148K]
Location: Port Neches, Orange County, TX
  Latitude N30°02'42.73"
  Longitude W93°55'17.72"
  Water depth 0.87 m
  Length recovered 1.05 m
  Date obtained 06/16/2000
  Date described 08/15/00
0-2.5 cm Mud Greenish black (5GY 2/1)
V. hydrous, no noticeable roots

* distinct contact
2.5-6 cm Sandy Mud Olive gray (5Y 4/1 - dark) with med. dark gray (N4)
Hydrous, no noticeable roots

* distinct contact
6-23 cm Organic Mud Olive black (5Y 2/1)
Root mat: 2% 1 cm, 80% 1-3 cm, 18% fibrous with mud holding roots together

* distinct contact
23-37 cm Organic Mud Olive black (5Y 2/1)
Much less rooted and increase in % mud than above section
Spongy texture
Roots: 2% 0.2 mm Ð 95% fibrous

* distinct contact
37-43 cm Organic Mud Brownish black (5YR 2/1) with grayish black (N2)
Looks similar to above section but darker and more compact
Still has spongy texture

* distinct contact
43-61 cm Organic Mud Brownish black (5YR 2/1) with grayish black (N2)
No spongy texture Ð more compact
49-51 cm mottled (light olive brown (5Y 5/6) area on right side
Mottling also present toward bottom of section (olive gray (5Y 3/2))
Roots: ² 0.2 mm (random)

* distinct contact Ð root penetration, jagged edges
61-87.5 cm Mud Light olive brown (5Y 5/6) to light olive grayish brown (5Y 5/4)
Oxidized paleosol Ð Deweyville
63-68.5cm and 71.5 cm mottling Ð organic Ð original laminations?
Section lightens and mottling decreases down core
Roots: fibrous (random)

* distinct contact
87.5-93 cm Muddy Sand Light olive grayish brown (5Y 5/4)
Oxidized fluvial sand Ð Deweyville
V. little mud, organic mottling (light olive brown (5Y 5/6) with grayish black (N2)
Roots: one, 1 mm root on right side of core at 92 cm

« Port Neches Core BH-00-03 | Port Neches Core BH-00-05 »

Coastal & Marine Geology Program >Subsidence and Fault Activation . . . > Open File Report 01-274


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