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The AAPG/Datapages Combined Publications Database
Journal of Petroleum Geology
Abstract
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Journal of Petroleum Geology, Vol.
MIGRATION
OF OIL GLOBULES*
* Approved for publication by the Director, Bureau of Economic Geology, The University of Texas at Austin.
** Bureau of Economic Geology, The University of Texas at Austin, Austin, Texas 78712, USA.
Abstract
migration
to overcome the capillary restrictions against
the oil. Movement of small oil globules in shales is believed by
many workers to be an extremely difficult process. However, the
above assumption is not necessarily valid in shales which contain
a large quantity of structured and semi-solid water. Such oil
globules may deform by the effect of compacting grains (solid
material) and the semi-solid water, thus reducing the capillary
restrictions significantly. This suggests that the small oil
globules which are separated from each other can move in the
direction of lower stress in the shales: a continuous oil phase
or relatively high oil concentration is not a necessary
requirement for primary oil
migration
.
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