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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-00-03
Core BH-00-03
[larger image 160K]
Location: Port Neches, Orange County, TX
  Latitude N30°02'42.81"
  Longitude W93°57'27.49"
  Water depth 0.87 m
  Length recovered 1.05 m
  Date obtained 06/16/2000
  Date described 08/18/00
0-59 cm Organic Mud Olive black (5Y 2/1)
At top - 1 valve of Rangia cuneata either stained greenish brown or chiton layer (freshwater) slightly leached
Roots: 50% 1-3mm, 50% fibrous
V. hydrous at top with an increase in mud and more compacted toward bottom
55.5 cm pale olive (10Y 6.2) mottling, closer to left side
Less of above roots visible toward bottom, bottom becoming more spongy

* gradational contact into laminations
59-80 cm Mud Grayish black (N2) with olive black (5Y 2/1) and olive gray (5Y 4/1) with med. gray (N5)
Alternating light and dark color laminations with organic mottling of lighter layers
Roots: fibrous (random), with a few 1mm roots at 61cm, 74-77cm (rt side)

* gradational contact
80-88 cm Organic Mud Olive black (5Y 2/1)
Organic spongy texture

*somewhat distinct contact
88-90 cm Mud Grayish black (N2) with olive black (5Y 2/1) and olive gray (5Y 4/1) with med. gray (N5)
Laminations not completely continuous left to right

* gradational contact
90-105 cm Organic Mud Olive black (5Y 2/1)
Organic spongy texture

« Port Neches Core BH-00-02 | Port Neches Core BH-00-04 »

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


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