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

摘要/Abstract

摘要：

根据指标相关性分析,从不同级别的油气显示中筛选出排烃下限指标,最终以R_o≥06%,SM≥010,C₂₉Mor/C₂₉Hop≤045,CPI≤1.3作为苏北盆地下第三系、泰州组源岩排烃“门槛值”圈定各套源岩的排烃范围。金湖凹陷中,阜四段可排烃生油层主要分布在三河、龙岗、汊西次凹,阜二段可排烃源岩主要分布在以上次凹及其内斜坡。高邮凹陷中,阜四段可排烃生油层范围主要局限在高邮深凹、刘陆舍次凹及内斜坡地带,阜二段可排烃源岩广泛分布于除柘垛凸起以外的地区。以荧光薄片、烃类包裹体法和油-岩成熟度对比追踪法探索油气运移边界。研究表明,来自高邮、临泽凹陷的远距离运移油气已经到达柘垛凸起。经分析,XC1井泰州组油可能来自临泽凹陷,这种“上生下储”现象大部分来自顺向(正)断层调整:而XG1井阜一段油来自高邮凹陷东部的泰州组成熟源岩,经长距离运移和反向(正)断层调整(“下生上储”)到达柘垛凸起的阜一段储集层,估算运移距离在20 km左右。

关键词: 排烃, 油气运移, 荧光薄片, 包裹体, 苏北盆地

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

中图分类号:

TE112.1

陈安定. 苏北盆地第三系烃源岩排烃范围及油气运移边界[J]. 石油与天然气地质, 2006, 27(5): 630-636. doi: 10.11743/ogg20060507 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. doi: 10.11743/ogg20060507

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