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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
1Manuscript received May 27, 1997;
revised manuscript received June 2, 1998; final acceptance October 22,
1998.
2China Offshore Oil Exploration and
Development Research Center, Gaobeidian, Hebei, 074000, China.
3East China Sea Oil Corporation, Shanghai,
200030, China.
ABSTRACT
The Zhu III subbasin is one of three subbasins
in the Pearl River Mouth Basin in the northern shelf of the South China
Sea. The Zhu III belongs to a rift basin initiated in the Paleogene, being
a part of the rifting lake group of Paleogene age in the Pearl River Mouth
Basin. The evolution of the Zhu III subbasin can be divided into three
stages: lacustrine facies of the early stage (Paleocene-middle Oligocene),
bay facies of the middle stage (late Oligocene), and open shallow marine
of the late stage (Neogene), forming, respectively, source, reservoir,
and seal rocks. The lacustrine sediments include the Wenchang Formation
(oil source rock) and the Enping Formation (gas source rock), which are
the source rocks of two petroleum systems in the study area. The Zhu III
subbasin experienced three obvious tectonic movements, of which the tenso-shear
movement in the late Oligocene and extensional movement at the end of the
middle Miocene formed the main oil-bearing structures in the study area.
Oil and gas exploration results, synthetic study of geochemical and thermal
modeling of the two source rocks, diagenesis and organic inclusions, and
basin modeling show that there are two petroleum systems in the Zhu III
subbasin: the Wenchang-Zhujiang(.) petroleum system in Wenchang B sag,
and the Enping-Zhuhai(.) petroleum system in the Wenchang A sag. In the
two petroleum systems, hydrocarbon generation, migration, and accumulation
peaks are late Miocene-Holocene.
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