澳大利亚Vulcan次盆Puffin油田油气源与成藏

doi:10.11743/ogg20120418

Abstract

Abstract:

Hydrocarbon sources,distribution of the major source rocks and timing of hydrocarbon generation and expulsion are poorly understood in Puffin oilfield,constraining future exploration.Two-dimension hydrocarbon generation modeling and biomarker fingerprinting reveal that the Lower Vulcan marine shale is the most important source rocks in the study area and its peak hydrocarbon generation and expulsion occurred from Cretaceous to Miocene.In contrast,the Plover source rocks got over matured during the Late Jurassic,and contributed limited hydrocarbons due to its low capability of hydrocarbon generation.The events chart shows that the traps on the Puffin horst were mainly formed in the Jurassic-Cretaceous period.Before the Miocene,the hydrocarbon generated from the Vulcan source rocks mainly accumulated in the Jurassic traps in the graben as faults were undeveloped in strata above the Jurassic.At the end of Miocene,lots of vertical faults were created or reactivated by the regional tectonic compression,causing that hydrocarbons in the early pools vertically migrated to and accumulated in the shallow Cretaceous reservoirs.So oil in the discovered Cretaceous reservoirs is mostly secondary.

Key words: source rock, hydrocarbon generation modeling, hydrocarbon accumulation, Vulcan sub-basin, Australia

CLC Number:

TE122.1

Shi Lei, Yin Jinyin, Tian Naxin, Jiang Xiangqiang, Lu Hongmei. Hydrocarbon sources and accumulation in Puffin oilfield, Vulcan sub-basin, Australia[J]. Oil & Gas Geology, 2012, 33(4): 624-632.

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Hydrocarbon sources and accumulation in Puffin oilfield, Vulcan sub-basin, Australia

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