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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Big Hill Field Jefferson County Texas
By
Exploration Geologist with Pan American Petroleum Corporation
(Mr. Dollison will be the speaker at the January, 1966 Meeting)
Big Hill Field is in the Frio Sand Trend on the western flank of Big Hill Salt
Dome. Multiple reservoirs in Miocene and Oligocene sands are on the downthrown
side of a regional up-to-coast growth fault that expands the thickness of
Lower Miocene and older sediments 57%. One Hackberry reservoir is bounded
by two growth faults and an erosional surface. The hydrocarbons trapped therein
are evidently indigenous to the surrounding rocks. An isopach map, "Top of
Frio to the Hackberry Unconformity," indicates that Big Hill salt dome was
formed prior to the end of Frio time; the crest of the dome at that time was
north of the present salt spine. This map also locates a buried down-to-coast
growth fault that traverses the west flank of Big Hill Field but does not intersect
any wells. Pressure performance histories of two reservoirs, and also of two wells not
producing from these reservoirs, are shown graphically in order to illustrate the
problems involved in explaining wells that are in pressure communication. Four
gas - fluid contacts in a continuous Marginulina reservoir differ in elevation
by 600'+ . These original gas contacts were created by hydrocarbons migrating
into a complexly faulted area. Accumulation of oil downdip from these gas
contacts can be reasonably explained in terms of gravity segregation effects. End_of_Record - Last_Page 14--------