济阳坳陷沾化凹陷古近系沙四段现今压力场特征及其与油气分布的关系

doi:10.11743/ogg20070305

Abstract

Abstract:

The measured pressure data and pressures calculated with balanced depth method are used to reconstruct pressure profiles and classify vertical pressure variation sequences in single well in Zhanhua sag.Two different types of sub-sag,i.e. sub-sags with normal-transitional and transitional-abnormal pressure,are recognized in the Paleogene Shahejie Formation in the sag where the vertical superimposed pressure field controls the distribution of oil and gas pools.There are three modes of coupling relationships between the reservoirs in the 4th member of Shahejie Formation(Es⁴) and the pressure fields: abnormal-pressure reservoirs,transitional-pressure reservoir,and normal-pressure reservoirs,among which the mode that oil with double lithologic and pressure seal are the most favorable to the formation of high yield reservoirs.The middle-deep normal pressure zone and transitional pressure zone in sub-sag of transitional-abnormal pressure are potential plays for the disco-very of high yield oil layers in the Es⁴.

Key words: abnormal pressure, distribution of oil and gas pools, principle of balanced depth method, Shahejie Formation, Zhanhua sag, Jiyang depression

CLC Number:

TE112.2

Qin Runsen, Xu Guosheng, Xu Xinyou, Li Jianlin, Yuan Haifeng. Characteristics of the present pressure filed in the Paleogene Sha-4 Member of Zhanhua sag,Jiyang depression and their function to the distribution of oil and gas pools[J]. Oil & Gas Geology, 2007, 28(3): 329-336,323.

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Characteristics of the present pressure filed in the Paleogene Sha-4 Member of Zhanhua sag,Jiyang depression and their function to the distribution of oil and gas pools

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