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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 COF-00-04
Core COF-00-04
[larger version 152 K]
Location: Caplen Oil Field, Galveston County, TX
  Latitude N29°30'48.88"
  Longitude W94°34'23.20"
  Water depth 0.43 m
  Length recovered 0.49 m
  Date obtained 06/19/2000
  Date described 08/15/00
0-4 cm Sandy Mud Dark gray (N3)
Shell fragments and whole bivalve valves (black, brown, opalescent)
Somewhat noncohesive

* distinct contact
4-10 cm Mud Dark gray (N3) to medium gray (N5)
Grayish black (N2) organic mottling disseminated
Roots: less than or equal to 1 mm (random)

* gradational contact
10-22 cm Sandy Mud Medium gray (N5) and light greenish gray (5GY 6/1)
Dark gray (N3) mottling - specks/lines (laminations that were bioturbated)
Iron-stained organic remains - Moderately light brown (5YR 4/5) and moderate brown (5YR 3/4) mottling
Lines and areas of mottling are typically vertical
V. fine-grained sand
Roots: less than or equal to 1 mm found within 8-10 cm, 11-14 cm with some random

* gradational contact
22-46 cm Sandy MudMedium gray (N5) and light greenish gray (5GY 6/1)
Similar to 10-22cm, but decreased mottling and increased iron staining
Lines and areas of mottling are typically vertical

Roots: less than or equal to 1 mm found within 24-25 cm with some random

* gradational contact
46-49 cm Mud and Sand Olive gray (5Y 4/1) and medium gray (N5)
½ core (left) is muddy sand lens (light olive gray (5Y5/2))
½ core (right) is sandy mud lens (med. dark gray (N4)) - however, mud does extend under sand lens at cm from bottom of core

« Caplen Field Core COF-00-03

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


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