深水湖盆层序地层单元识别方法——以Muglad盆地Fula坳陷为例
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摘要
以Muglad盆地Fula坳陷的Abu Gabra组上段为例,探讨了深水湖盆层序地层单元的识别方法。地震反射终止类型和地震相分析有助于划分大级别的层序界面,对地震资料的时频分析指导了三级层序及其体系域的识别,放射性测井资料的应用则可在钻井剖面上较精确地确定各级层序地层单元的界面。最终在Abu Gabra组上段划分了4个三级层序,其中层序二为三分层序,包括低位体系域、湖侵体系域和高位体系域,其他均为TR层序,分为湖侵体系域和湖退体系域。
By taking the upper member of Abu Gabra Formation in Fula depression of Muglad basin as an example,methods for identifying sequence section of reservoir in deep-water basins are discussed.Analyses of seismic reflection termination forms and seismic facies can be used to identify high-leveled sequence boundaries.Seismic time-frequency analyses can be applied to the identification of third-level sequences and other system domains.The application of nuclear logging curves can be used to accurately determine boundaries of sequence reservoir sections.Finally,the upper member of Abu Gabra Formation is divided into four third-level sequences,and Sequence 2 is subdivided into three parts as low order system domain,lake transgressive system doamin and high order system domain,and the other sequences are all TR sequences which can be subdivided into lake transgressive system domain and lake regressive system doamin.
By taking the upper member of Abu Gabra Formation in Fula depression of Muglad basin as an example,methods for identifying sequence section of reservoir in deep-water basins are discussed.Analyses of seismic reflection termination forms and seismic facies can be used to identify high-leveled sequence boundaries.Seismic time-frequency analyses can be applied to the identification of third-level sequences and other system domains.The application of nuclear logging curves can be used to accurately determine boundaries of sequence reservoir sections.Finally,the upper member of Abu Gabra Formation is divided into four third-level sequences,and Sequence 2 is subdivided into three parts as low order system domain,lake transgressive system doamin and high order system domain,and the other sequences are all TR sequences which can be subdivided into lake transgressive system domain and lake regressive system doamin.
引文
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[2]汪望泉,窦立荣,张志伟,等.苏丹福拉凹陷转换带特征及其与油气的关系[J].石油勘探与开发,2007,34(1):124-127.
[3]姜在兴,杨伟利,操应长.东营凹陷沙河街组三段—二段下亚段沉积层序及成因[J].石油与天然气地质,2002,23(2):127-129.
[4]张明学,蒋波,文瑞霞.层序地层学在齐家北地区的应用[J].大庆石油地质与开发,2006,25(5):24-26.
[5]张军华,王永刚,杨国权,等.地震旋回体的概念及应用[J].石油地球物理勘探,2003,38(3):281-284.
[6]陈中红,查明.铀曲线在沉积盆地古环境反演中的应用[J].石油大学学报(自然科学版),2004,28(6):11-15.
[7]张占松.测井资料识别层序的方法及问题讨论[J].石油勘探与开发,2000,27(5):117-121.
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