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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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San Joaquin Basin (1)
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United States
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California
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Kern County California (1)
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Midway-Sunset Field (2)
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Temblor Range (1)
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commodities
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oil and gas fields (2)
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petroleum (1)
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geologic age
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Cenozoic
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Tertiary
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Neogene
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Etchegoin Formation (2)
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Miocene
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Antelope Shale (1)
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Pliocene (1)
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Tulare Formation (1)
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Primary terms
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Cenozoic
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Tertiary
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Neogene
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Etchegoin Formation (2)
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Miocene
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Antelope Shale (1)
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Pliocene (1)
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Tulare Formation (1)
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data processing (1)
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geophysical methods (1)
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oil and gas fields (2)
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paleogeography (1)
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petroleum (1)
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petrology (1)
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sedimentary rocks (1)
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United States
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California
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Kern County California (1)
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Midway-Sunset Field (2)
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Temblor Range (1)
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rock formations
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Monterey Formation (2)
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sedimentary rocks
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sedimentary rocks (1)
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Although the Etchegoin Formation is considered to be Pliocene in age, K-Ar and 87 Sr/86 dating indicates that the lower part of the formation may be of late Miocene age. Molluscan fauna and foraminiferal assemblages indicate it was deposited in shallow-marine to intertidal and estuarine environments. Trapping of oil in the Etchegoin is caused by the pinchout or truncation of individual sandstone members often against the flanks of anticlines. The Etchegoin Formation produced most of the first one billion barrels of Midway-Sunset’s 2.4 billion barrels of cumulative oil production indicating much future potential remains.
In 1991 and 1993 two seismic surveys were acquired across and in the vicinity of the Midway-Sunset Oil Field. High quality imaging has been difficult to obtain due to noise from the thousands of pumping wells, and steamflood operations associated with the field. Complex subsurface structure has also contributed to the problem. This paper discusses the acquisition and processing history of these surveys and the numerous methods applied to analyze and to reduce the effects of "production" noise. Also, discussed is the application of a mini-3D processing technique on one test line. This technique has provided results indicating that imaging quality of a 3D survey may be substantially su- perior to that of comparable 2D data.