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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-00-02
Core BH-00-02
[larger version 160K]
Location: Port Neches, Orange County, TX
  Latitude N30°01'24.94"
  Longitude W93°57'14.05"
  Water depth 0.89 m
  Length recovered 0.65 m
  Date obtained 06/16/2000
  Date described 08/18/00
0-33 cm Organic Mud Brownish black (5YR2/1)
Top of section Ð organic spongy material
Roots: 5% 0.5mm, 95% fibrous
Middle to bottom of section Ð fibrous roots present but not common
Spongy texture decreases and % mud increases with depth
Some slight mottling at 27cm (med. gray (N5))

* gradational contact
33-49 cm Mud Med. dark gray (N4) to med. light gray (N6)
Abundant mottling disseminated, mottling (dark gray (N3)) may
represent original laminations
Section becomes lighter down core
Roots: 2% 0.5mm, 98% fibrous (random)

* gradational contact
49-55 cm Mud Med. gray (N5) to med. light gray (N6)
Looks just like above section except large patches of oxidized organic material - light olive brown (5Y5/6) and mod. olive brown (5Y4/4) with dusky yellowish green (10GY3/2) and light olive (10Y5/4) Ð pelletlike features

* gradational contact Ð load feature?
55-65 cm Mud Olive gray (5Y 4/1)
Slight organic mottling and more uniform brown color
61cm - small lens of v. fine-grained sand

« Port Neches Core BH-00-01 | Port Neches Core BH-00-03 »

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


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