Hydrocarbon Accumulation of Paleozoic Strata in Peripheral Areas of Nanpu Sag

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  • School of Info physics and Geomatics Engineering,Central South University,Changsha 410083,China

Received date: 2008-07-08

  Revised date: 2008-12-16

  Online published: 2009-02-10

Abstract

Nanpu sag in Bohaiwan basin is a Tertiary halfgraben-type fault sag, and is also one of the subtectonic units of Huanghua depression. The Paleozoic hydrocarbon pool was studied. The source rock in the peripheral areas of Nanpu sag isn't the carbonates but the Lower Tertiary strata. Fault and unconformity are the main long-distance migration pathways, and oil accumulates at the high position of structure, which forms the reservoir of young source and old reservoir type. It is characterized by the lower matrix porosity for carbonates, and the primary pore hasn't the reservoir capacity. The late-|formed unfilled tectonic fracture is the dominant reservoir space for oil migration and accumulation. The paleokarst zone can'tbe explicitly divided in vertical, and corroded cavity is isolated, with worse connectivity. In this zone, the reservoir types mainly consist of unconformity reservoir and structural reservoir.

Cite this article

CHENG Yong-Sheng, CHEN Song-Ling . Hydrocarbon Accumulation of Paleozoic Strata in Peripheral Areas of Nanpu Sag[J]. Natural Gas Geoscience, 2009 , 20(1) : 108 -112 . DOI: 10.11764/j.issn.1672-1926.2009.01.108

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