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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Regional Factors that Control 
Oil
and Gas Accumulation *
Oil and Gas AccumulationBy
University of Texas, M. A. Thesis, January 1966
A comparison of three diverse producing provinces indicates that The great Lima, Ohio-Indiana, Most of the End_of_Record - Last_Page 16--------
oil and gas
which gained access to the reservoir rocks migrated as far as the continuity of
the permeable reservoir permitted, until they accumulated finally at stratigraphic
or structural barriers impassable to further movement.
Oil fields in Upper Cretaceous formations of southwestern Arkansas produce
from sands, which have an identifiable distribution with relation to the position
of contemporary shorelines. Regional lateral gradation from sandstone to shale
defines one limit of potentially productive territory. The up-dip regional boundary
of production occurs where a major fault system cuts across the area of
good sand development and supplied traps which halted further migration.
Origin of the oil was in shale, which is interbedded with the sandstone.
oil and gas field is at the up-dip edge of an
extensive porous dolomite facies of the Trenton (Middle Ordovician) limestone,
where the regional reservoir terminates on the limbs of the broad Cincinnati
arch. Probably the oil and gas were indigenous to the Trenton; during development
of the major structural feature and its associated minor flexures they
migrated from a wide area t o accumulate locally.
oil and gas in the Ellenburger Limestone (Early Ordovician) of
west Texas and New Mexico occur in a widespread porous zone which resulted
from subaerial leaching during a brief time, before the Ellenburger was
covered by the impermeable Joins Limestone of the Ordovician Simpson Group.
The porous upper part of the Ellenburger produces little oil where a much
longer time elapsed before it was covered. The hydrocarbons were indigenous
to the Ellenburger and were retained in it within the district where it was soon
covered. A late Mississippian-Early Pennsylvanian orogeny formed numerous
anticlines in which the oil and gas of the regional reservoir accumulated locally.
