The Performance of the Ten Section Oil Field
- W. Tempelaar Lietz (Shell Oil Company)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- September 1949
- Document Type
- Journal Paper
- 251 - 258
- 1949. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 5.1.1 Exploration, Development, Structural Geology, 1.6 Drilling Operations, 4.1.2 Separation and Treating, 2.4.3 Sand/Solids Control, 4.3.4 Scale, 5.2.1 Phase Behavior and PVT Measurements, 5.4.2 Gas Injection Methods, 2.2.2 Perforating, 4.1.5 Processing Equipment
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The Ten Section oil field is located in the San Joaquin Valley in KernCounty, California, about 12 miles southwest of Bakersfield in Township 30South, Ranges 25 and 26 East. The accumulation is in a low relief anticlinaldome and has a productive area of approximately 2,200 acres. Discovered in 1936as a result of seismic work, it was the first field on the floor of the Valleyto obtain production. It had a small primary gas cap, and since its inceptionhas been produced by depletion with controlled withdrawal from the gas cap tominimize blowthrough.
Structure and Stratigraphy
The Ten Section structure is an elongated anticlinal dome with flank dips ofonly about 7 degrees. A map of the field, now fully developed, and a compositelog are shown in Figs. 1 and 2. Contours shown on the map are on the top of thefirst zone, or Marker XA as indicated on the composite log.
As shown, the field has a productive closure of only some 350 feet, and thereapparently is no faulting in the reservoir.
The productive measures in Ten Section are of Upper Miocene age and are knownas the Stevens sand. They contain thin, irregular shale or siltstone streakswhich vary considerably in stratigraphic position and thickness and apparentlyare rather discontinuous. As a result, individual sands and shales cannot becorrelated over any appreciable area, which makes it difficult to subdivide thesand body into separate zones which are distinct throughout the field. However,there are two fairly persistent siltstone bodies that at the time ofdevelopment were considered to divide the productive measures into threegeneral zones.
The first, or uppermost zone is productive over the entire field and has anaverage thickness of 180 feet, of which some 65 per cent is sand. It had aprimary gas cap in the crestal area with an areal extent of 930 acres. Thesecond zone has a productive area somewhat smaller than the first zone, but itdid not have any original gas cap. It has an average thickness of about 360feet, of which 55 per cent is sand. The third zone has a very limited arealextent and a maximum productive thickness of 100 feet, of which 80 per cent issand. Recently, a deeper oil accumulation, termed the "53" sand, wasdiscovered, but it is not discussed in this analysis. In the first and secondzones the water table was at 7,980 feet subsea, while in the third zone it wasat 8,080 feet subsea.
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