应用定量颗粒荧光技术分析红河油田延长组油气输导机制及运聚规律
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摘要
鄂尔多斯盆地西南缘红河油田延长组油气运聚规律不明确,制约了进一步的油气勘探。综合地质、气测录井、测井数据以及定量颗粒荧光技术分析结果,推导出在致密砂岩条件下油气沿断裂向下输导的压力衰降梯度模型,进而对红河油田延长组油气输导机制进行研究,剖析油气运聚规律。研究结果表明:油气沿断层向下输导的压力衰降梯度为(0.028±0.01) MPa/m,沿裂缝向下输导的压力衰降梯度约为0.24 MPa/m;油气先沿裂缝垂向输导、再沿断层垂向输导的运移接力的压力衰降梯度为0.14~0.18 MPa/m。在早白垩世晚期,研究区油气主要来自长7段主力烃源岩,在异常高压的驱动下,沿断层破裂带及裂缝垂向运移至长8段,并在长8段输导层中进行短距离、小范围、树枝状的侧向运移,至有效区域聚集成藏。红河油田长8段有利勘探目标为断裂系统开启与输导层发育叠合区、储层物性"甜点"区域的岩性圈闭及局部良好侧向封堵条件的岩性-构造圈闭、超压带剩余地层压力低值区与相对低势区的叠合区域。
The mechanisms and rules of hydrocarbon migration and accumulation in the Yanchang Formation of Honghe Oilfield in southwestern Ordos Basin are still unclear,which restricts the further exploration in this region. In this paper,a pressure-drop gradient model was derived in the situation of hydrocarbon migrating downward along faults and fractures in tight sandstone to investigate transport mechanisms of hydrocarbon entrapped in the Yanchang Formation of Honghe Oilfield and analyze the rules of their migration and accumulation based on the comprehensive analysis of geologic setting,gaslogging,well-logging data and results obtained by quantitative grain fluorescence techniques. The results show that the pressure-drop gradient of hydrocarbon migration downward is Δp3=(0.028 ± 0.01) MPa/m along the faults,and 0.24 MPa/m along the fractures;in the case that the hydrocarbon migrates downward along the fractures firstly and then along the faults,the range of pressure-drop gradient is 0.14-0.18 MPa. In the late Early Cretaceous,the hydrocarbon was generated from source rock of Chang7 member mostly,and was driven by abnormal formation pressure to be transported to Chang8 member along the faults and fractures vertically. The hydrocarbon then migrated laterally along the microfractures in short distance,within small range and forming dendritic path,and accumulated in effective regions. Finally,favorable exploration targets found in Chang8 member of Honghe Oilfield are areas having open fractures and transporting layers superimposing each other,lithologic traps in"sweet spots"area with good reservoir physical property,lithology-structure traps with better regional lateral seal and layers with low residual formation pressure and relative low potential in overpressure zone.
The mechanisms and rules of hydrocarbon migration and accumulation in the Yanchang Formation of Honghe Oilfield in southwestern Ordos Basin are still unclear,which restricts the further exploration in this region. In this paper,a pressure-drop gradient model was derived in the situation of hydrocarbon migrating downward along faults and fractures in tight sandstone to investigate transport mechanisms of hydrocarbon entrapped in the Yanchang Formation of Honghe Oilfield and analyze the rules of their migration and accumulation based on the comprehensive analysis of geologic setting,gaslogging,well-logging data and results obtained by quantitative grain fluorescence techniques. The results show that the pressure-drop gradient of hydrocarbon migration downward is Δp3=(0.028 ± 0.01) MPa/m along the faults,and 0.24 MPa/m along the fractures;in the case that the hydrocarbon migrates downward along the fractures firstly and then along the faults,the range of pressure-drop gradient is 0.14-0.18 MPa. In the late Early Cretaceous,the hydrocarbon was generated from source rock of Chang7 member mostly,and was driven by abnormal formation pressure to be transported to Chang8 member along the faults and fractures vertically. The hydrocarbon then migrated laterally along the microfractures in short distance,within small range and forming dendritic path,and accumulated in effective regions. Finally,favorable exploration targets found in Chang8 member of Honghe Oilfield are areas having open fractures and transporting layers superimposing each other,lithologic traps in"sweet spots"area with good reservoir physical property,lithology-structure traps with better regional lateral seal and layers with low residual formation pressure and relative low potential in overpressure zone.
引文
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[10]杜春国,郝芳,邹华耀,等.断裂输导体系研究现状及存在的问题[J].地质科技情报,2007,26(1):51-56.DU Chunguo,HAO Fang,ZOU Huayao,et al.Progress and problems of faults conduit systems for hydrocarbon migration[J].Geological Science and Technology Information,2007,26(1):51-56.
[11]贾京坤,尹伟,邱楠生,等.红河油田延长组长8段油气输导体系及运聚模式[J].油气地质与采收率,2016,23(2):9-15.JIA Jingkun,YIN Wei,QIU Nansheng,et al.Petroleum carrier systems and migration and accumulation patterns in Chang8 member of Yanchang Formation in Honghe oilfield[J].Petroleum Geology and Recovery Efficiency,2016,23(2):9-15.
[12]LIU K Y,EADINGTON P.A new method for identifying secondary oil migration pathways[J].Journal of Geochemical Exploration,2003,78(3):389-394.
[13]LIU K Y,EADINGTON P.Quantitative fluorescence techniques for detecting residual oils and reconstructing hydrocarbon charge history[J].Organic Geochemistry,2005,36(7):1 023-1 036.
[14]陈冬霞,庞雄奇,张俊,等.应用定量颗粒荧光技术研究岩性油气藏的隐蔽输导通道[J].地质学报,2007,81(2):250-254.CHEN Dongxia,PANG Xiongqi,ZHANG Jun,et al.Application of quantitative grain fluorescence techniques to study of subtle oil migration pathway of lithological pool[J].Acta Geologica Sinica,2007,81(2):250-254.
[15]李素梅,庞雄奇,刘可禹,等.一种快速检测油包裹体的新方法——颗粒包裹烃定量荧光分析技术及其初步应用[J].石油实验地质,2006,28(4):386-390.LI Sumei,PANG Xiongqi,LIU Keyu,et al.A new approach to discriminate oil fluid inclusions quickly:Quantitative grain fluorescence(QCF)techniques and its application[J].Petroleum Geology&Experiment,2006,28(4):386-390.
[16]李卓,姜振学,李峰.应用定量颗粒荧光技术恢复塔中地区石炭系油气充注历史[J].石油学报,2013,34(3):427-434.LI Zhuo,JIANG Zhenxue,LI Feng.The application of quantitative grain fluorescence technique to restore the hydrocarbon charge history of Carboniferous reservoirs in Tazhong area,Tarim Basin[J].Acta Petrolei Sinica,2013,34(3):427-434.
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