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Vertical Micro-migration of Hydrocarbons from Subsurface Reservoirs and  Geological Significance in Near-surface Geochemical Exploration for Oil and Gas

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  • 1.Wuxi Research Institute of Petroleum Geology,Research Institute of Petroleum Exploration
    and Production,SINOPEC,Wuxi 214151,China;2.Institute of Geological Experimentation,
    Anhui Bureau of Geology and Mineral Resources Exploration,Hefei 230001,China

Received date: 2011-01-04

  Revised date: 2011-03-21

  Online published: 2011-10-10

Abstract

In this paper,we discuss the genetic correlation between geochemical anomaly and vertical micro\|migration of hydrocarbons from the subsurface oil and gas reservoirs and its geological significance in petroleum geology by means of vertical migration modes and controlling factors,as well as oil and gas accumulation and geochemical anomaly distribution in the Linnan block oil and gas field in the Bohai Bay basin and the Yakela condensate gas field in the Tarim basin.According to geochemical anomaly distribution,Xiakou fault in the Linnan oil and gas accumulation system act as a barrier for lateral migration of oil and gas but a vertical pathway in the study area,indicating that Xiakou fault plays a role of both relative barrier to lateral migration and absolute pathway to vertical migration.Geochemical anomaly has been distributed as a halo shape around the structural high point of Yakela gas field,suggesting that the gas seal would control vertical migration and space distribution of geochemical anomaly.Distribution of the heavier anomaly is consistent with lateral variation of sealing of caprock,indicating that the sealing of caprock to heavier hydrocarbons is more than that to methane.In two cases,we find out that the near-surface geochemical anomaly is related with oil and gas accumulation and vertical oil and gas micro-migration.

Cite this article

JIANG Tao, ZHAO Ke-Bin, RONG Fa-Zhun, ZHANG Heng-Qi . Vertical Micro-migration of Hydrocarbons from Subsurface Reservoirs and  Geological Significance in Near-surface Geochemical Exploration for Oil and Gas[J]. Natural Gas Geoscience, 2011 , 22(5) : 901 -908 . DOI: 10.11764/j.issn.1672-1926.2011.05.901

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