苏北盆地第三系烃源岩排烃范围及油气运移边界

doi:10.11743/ogg20060507

Abstract

Abstract:

Based on the analysis of index correlativity,the lower limit of hydrocarbon expulsion indexes(R_o≥0.6%,SM≥0.10,C₂₉Mor/C₂₉Hop≤0.45,and CPI≤1.3)are selected through the study of shows at various levels.The indexes are used as the threshold values of hydrocarbon expulsion from source rocks in the Paleogene and Taizhou Formation in Subei basin to define the expulsion range of each set of source rocks.In Jinhu sag, the source rocks capable of expulsion in the fourth Member of Funing Formation are mainly distributed inSanhe, Longgang,and Chaxi sub-sags;and that in the second Member pf Funing Formation are also mainly located in the above-mentioned three sub-sags and their inner slopes.While in Gaoyou sag,source rocks capable of expulsion in the fourth Member of Funing Formation are mainly limited within the deep o fGaoyou sag,Liulushe subsag,and the inner slope,and that in the second Member of Funing Formation are extensively distributed in all areas but the Zheduo swell.Methods such as fluorescence thin section,hydrocarbon inclusion analysis,and oilsource correlation and tracing are employed to explore the oil and gas migration boundary in the basin.According to the research,hydrocarbons from Gaoyou and Linze sags have accumulated in Zheduo swell after a long distance migration.The analysis shows that the oil in Taizhou Formation in Well XC 1 might come from the Linze sag.The phenomenon that hydrocarbons generated by the upper source rocks accumulate in the lower reservoirs is largely the result of consequent normal fault adjustment; while the oil in the first Member of Funing Formation in Well XC1 might come from the mature source rocks in the Taizhou Formation in eastern Gaoyou sag after a long distance migration(about 20 km)resulted from antithetic normal fault adjustment(hydrocarbons generated from the lower source rocks accumualate in the upper reservoirs).

Key words: expulsion, hydrocarbon migration, fluorescence thin section, hydrocarbon inclusion, Subei basin

CLC Number:

TE112.1

Chen Anding. Range of hydrocarbon expulsion from the Tertiary source rocks and hydrocarbon migration boundary in Subei basin[J]. Oil & Gas Geology, 2006, 27(5): 630-636.

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Range of hydrocarbon expulsion from the Tertiary source rocks and hydrocarbon migration boundary in Subei basin

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