Natural Gas Geoscience ›› 2003, Vol. 14 ›› Issue (2): 97-102.doi: 10.11764/j.issn.1672-1926.2003.02.97

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 CONDITIONS AND MECHANISM OF HYDROCARBON ACCUMULATION IN OVERPRESSURED SYSTE MS IN SEDIMENTARY BASINS

CHEN Zhong-hong, ZHA MING, QU Jiang-xiu   

  1. (University of Petroleum, Dongying 257061, China)
  • Received:2003-01-23 Revised:2003-03-03 Online:2003-04-20 Published:2003-04-20

Abstract:

The research and practice of exploration show that overpressure systems in sedim entary basins have close relationship with hydrocarbon occurrence and are signif icant for exploration of deep reservoirs.Overpressure inhibits or retards the  generation and maturation of hydrocarbon and improves the porosity and permeabil ity of the reservoirs. It also strengthens the sealing for hydrocarbon and broa dens the range of“liquid state window”which determines the accumulation and po oling of natural gas. So it creates favorable conditions for the exploration an d development of reservoirs in the deep of basin. Overpressure systems formes i ndependent hydrocarbon accumulation systems as a form of compartment from which  fluid releases repetitively through a cycle of healed state to fracturing state .There are still many problems to resolve, especially for the relationship bet ween overpressure and hydrocarbon generation, which has been argued, and the mec hanism of hydrocarbon accumulation in overpressure systems. The issues of hydro carbon accumulation in overpressure systems will be important tasks for oil or g as exploration in future.

Key words: Sedimentary basin, Overpressure system, Hydrocarbon accumulation, Hydrocarbon generation, Epiisodic expulsion, Seal compartment

CLC Number: 

  • TE122.1

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