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Journal Article
Genesis of solid bitumen
2020
Overview
This paper presents a new schematic model for generation and timing of multiple phases of solid bitumen throughout the continuum of organic matter maturation in source and tight reservoir rocks. Five distinct stages in the evolution of solid bitumen are proposed: (1)
diagenetic solid bitumen
(or
degraded bituminite
), which is not a secondary maceral resulting from the thermal cracking of kerogen. Instead it is derived from degradation of
bituminite
in the diagenesis stage (Ro < 0.5%); (2)
initial-oil solid bitumen
, is a consolidated form of early catagenetically generated bitumen at the incipient oil window (Ro ~ 0.5–0.7%); (3)
primary-oil solid bitumen
is derived from thermally generated bitumen and crude oil in the primary oil window (Ro ~ 0.7–1.0%); (4)
late-oil solid bitumen
(solid-wax) is derived from the waxy bitumen separated from the mature paraffinic heavy oil in the primary- and late-oil windows; and (5)
pyrobitumen
, which is mainly a non-generative solid bitumen, is evolved from thermal cracking of the remaining hydrocarbon residue and other types of solid bitumen in the dry gas window and higher temperature (Ro > 1.4%). This model shows concurrence of multi-populations solid bitumen with oil, bitumen, and other phases of fluid hydrocarbon residue during most of the maturity continuum.
Publisher
Nature Publishing Group UK
