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Structural and depositional history. McAllen Ranch field, Hidalgo County, Texas

Journal Article · · Trans., Gulf Coast Assoc. Geol. Soc.; (United States)
OSTI ID:5456000
Lower Vicksburg sandstones form multiple gas reservoirs at depths that range from 9300 to 15,400 ft (2836 to 4697 m). Reservoir sandstones appear to represent channel deposits that were closely bounded by levee sediments. Isopach maps show that the sandstones are narrow, linear bodies which have dip trends in the upper part of the section. However, deeper sandstones in the east part of the field show anomalous strike trends. Structure within the field appears to be dominated by a deep-seated shale uplift which caused the formation of a major growth fault. The fault plane dip decreases with depth and becomes essentially parallel to bedding. Shale uplift soon ended because trends of later sandstones in the Lower Vicksburg formation are not greatly affected. However, the growth fault was active through the end of Lower Vicksburg deposition. This pattern of early shale uplift and subsequent growth faulting contrasts with previous ideas that attribute shale uplift and faulting to loading by rapid deposition of overlying sediment.
OSTI ID:
5456000
Journal Information:
Trans., Gulf Coast Assoc. Geol. Soc.; (United States), Journal Name: Trans., Gulf Coast Assoc. Geol. Soc.; (United States) Vol. 29; ISSN TGCGA
Country of Publication:
United States
Language:
English

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