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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-00-01
Core COF-00-01
[larger version 148 K]
Location: Caplen Oil Field, Galveston County, TX
  Latitude N29°29'41.05"
  Longitude W94°35'21.89"
  Water depth 0.13 m
  Length recovered 0.73 m
  Date obtained 06/18/2000
  Date described 08/21/00
0-2 cm Mud Olive gray (5Y3/2)
Mostly hydrous mud
Roots: 10% 1mm, 90% fibrous (random)

* gradational contact
2-17 cm Organic Mud Olive gray (5Y3/2) to greenish black (5GY 2/1) with depth
Less hydrous than above and slightly noncohesive
Roots: 20% 1 mm, 80% <1 mm - fibrous

* gradational contact
17-27cm Mud Dark gray (N3)
Some med. light gray (N6) and grayish black (N2) mottling
More mud present and more compacted than above
Spongy texture at top which decreases toward bottom
Roots: 15% <1 mm, 85% fibrous

* gradational contact
27-52 Mud Medium gray (N5) to med. light gray (N6) and greenish gray (5GY 6/1) with depth
Disseminated grayish black (N2) mottling except a horizontal feature (lamination) ~42cm which is below a few 0.5-1cm diameter lenses of mottled v. fine-grained sandy mud 40-41cm
Roots: less than or equal to 1 mm (random to common)

* distinct contact
52-73 Sandy Mud Greenish gray (5GY 6/1)
Drag of upper section present along rt side of core 51-69 cm
Iron-stained organic remains moderately light brown (5YR 4/5) and moderate brown (5YR 3/4) 68.5-73 cm
Roots: less than or equal to 1 mm (random to common)

« Port Neches Core BH-00-06 | Caplen Field Core COF-00-02 »

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


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