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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-00-01
Core BH-00-01
[larger version 96K]
Location: Port Neches, Orange County, TX
  Latitude N30°01'15.28"
  Longitude W93°57'23.48"
  Water depth 0.06 m
  Length recovered 0.81 m
  Date obtained 06/16/2000
  Date described 08/18/00
0-10 cm Organic Mud Olive gray (5Y3/2)
Root mat: 5% 1cm, 40% 1-2mm, 55% fibrous with mud holding roots together, roots are v. dense at top, section becomes less rooted with increased mud toward bottom of section

* distinct contact
10-24 cm Organic Mud Medium dark gray (N4)
~1/4 to 1/3 the number of roots as above section
Roots: 35% 1-2mm, 65% fibrous, roots are not dense and mud is water saturated, root density decreases and % mud increases toward bottom of section

* distinct contact
24-34 cm Organic Mud Olive black (5Y2/1)
Root mat: 60% 2-3cm , 20% 1-2mm, 20% fibrous with mud holding roots together

* distinct contact
34-53 cm Organic Mud Brownish black (5YR 2/1) to black (N1)
Compressed, spongy, organic material with 1% ≤ 0.5mm, 99% fibrous
Visible roots, spongy texture decreases and % mud increases toward bottom

* gradational contact
53-73 cm Mud Grayish black (N2) and med. dark gray (N4) to med. light gray (N6)
2cm root trace (or burrow) protrudes through to 57cm and resembles organic spongy texture of above section.
57-68.5cm and around above feature, common mottled (some grayish black (N2)) mud– bioturbation
Section becomes slightly more mottled and lighter in color toward bottom
Roots: ≤ 0.5mm (random)

* gradational contact

* at 73cm ~1mm in thickness – light olive (10Y5/4) oxidized layer (looks like algal mat)
73-81 cm Mud Med. gray (N5) and med. light gray (N6)
Below light olive layer there is a small lens of light olive (10YR 5/4) organic remains on left side of core
Color darkens and becomes more olive gray (5Y 4/1) toward bottom

« Caplen Profile M-N | Port Neches Core BH-00-02 »

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


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