Introduction and Background
Chevron Petroleum Company in 2001 donated an estimated 50,000 foraminifer slides, 5,000 well logs, geologic and surface locality maps, and paleontologic reports to the California Academy of Sciences and Stanford University for safekeeping, because they stopped or cut back exploration for petroleum deposits in California. The material was loaned to Earl Brabb temporarily so that information useful to the U.S. Geological Survey could be extracted. Among the estimated 5,000 well logs, more than 2,500 were printed on fragile Ozalid paper that had deteriorated by turning brown and hardening so that they could be easily damaged. These 2,516 well logs were scanned to provide a digital copy of the information (data set 1, posted separately at https://pubs.usgs.gov/of/2011/1262/of2011-1262_data_set1_filecabinets
The 2,516 wells extend over an area from Eureka in Humboldt County south to the Imperial Valley and from the Pacific Ocean east to the eastern side of the Great Valley and the Los Angeles Basin. The wells are located in 410 7.5-minute quadrangle maps in 42 counties. The digital information herein preserves the data, makes the logs easily distributed to others interested in subsurface geology, and makes previously proprietary information widely available to the public for the first time.
|
Text
- Report PDF—explanatory text for this publication (1 MB)
Data
- Readme TXT—File that explains the data sets (4 kB)
- Data Set 1 folder—Scanned images of the original logs for each of the 2,516 wells (5.7 GB total)
- Data Set 2 folder—Well location and summary for each of the 2,516 paleologs (spreadsheet in several formats; 5.2 MB total)
-
This report is available only on the Web.
Part of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge. |