利用地震属性分析沉积环境的误区:以辽河盆地滩海东部凹陷东二段为例
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摘要
为了解辽河盆地滩海地区东二段沉积相类型,通过现代河流沉积调研以及岩心、测井、地震相综合分析,结果证明:滩海地区东二段沉积相类型主要以滨浅湖-滩坝相为主,而非地震属性图所反映的河流相沉积,地震属性解释存在误区。古沉积环境解释最重要的因素就是如何理解"保存"的概念。河流在自身演化过程中迁移、改道时常发生,在漫长的地质时间内,难以保存一个完整的河道。沉积环境分析中,应当遵循从岩心相—测井相—地震相的分析过程,而不是单纯依据地震属性直接进行沉积相研究。
To better understand sedimentary types in the Dong2member of offshore in the Liaohe Basin,through the research of modern river deposition and comprehensive analyses of cores,well logs,and seismic profiles,it was proved that the dominant facies in Dong2member is characterized by shore shallow lacustrine-beach-bar facies,instead of the fluvial facies deduced by seismic attributes slices.The key factor in interpreting ancient depositional environment is the concept of"preservation".Migration and divagation often happened during the river evolution,so it is hard to preserve a complete river channel.Analyses of the sedimentary environments should follow the study order of core facies-logging facies-seismic facies,but not only based on seismic attributes.
To better understand sedimentary types in the Dong2member of offshore in the Liaohe Basin,through the research of modern river deposition and comprehensive analyses of cores,well logs,and seismic profiles,it was proved that the dominant facies in Dong2member is characterized by shore shallow lacustrine-beach-bar facies,instead of the fluvial facies deduced by seismic attributes slices.The key factor in interpreting ancient depositional environment is the concept of"preservation".Migration and divagation often happened during the river evolution,so it is hard to preserve a complete river channel.Analyses of the sedimentary environments should follow the study order of core facies-logging facies-seismic facies,but not only based on seismic attributes.
引文
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[15]崔承琦,孙晓霞,施建堂,等.近代黄河三角洲海岸发育体系:黄河三角洲潮滩海岸时空谱系研究[J].海洋通报,2001,20(5):31-39.
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[17]李庆忠.近代河流沉积与地震地层学解释[J].石油物探,1994,33(2):26-41.
[18]孟卫工.辽河滩海地区东营组沉积特征与沉积演化[J].石油天然气地质,2010,31(5):567-575.
[2]Zeng H L,Backus M M,Barrow K T,et al.Stratal sli-cing,PartⅠ:Realistic 3-D seismic model[J].Geophysics,1998,63:502-513.
[3]Zeng H L,Ambrose W A.Seismic sedimentology and regionaldepositional systems in Mioceno Norte,Lake Maracaibo,Vene-zuela[J].The Leading Edge,2001,20(11):1260-1269.
[4]Brown A R.Seismic attributes and their classification[J].The Leading Edge,1996,15(10):1090-1103.
[5]Brown A R,Dabm C G,Graebner R J.A stratigraphic casehistory using thredd-dimensional seismic data in the Gulf ofThailand[J].Geophysical Prospecting,1981,29(3):327-349.
[6]Schlager W.The future of applied sedimentary geology[J].Journal of Sedimentary Research,2000,70(1):2-9.
[7]韩喜.利用地震属性沿层分析方法研究河流相沉积环境[J].石油地球物理勘探,2007,42(1):120-124.
[8]凌云研究组.基本地震属性在沉积环境解释中的应用研究[J].石油地球物理勘探,2003,38(6):642-653.
[9]刘保国,刘力辉.实用地震沉积学在沉积相分析中的应用[J].石油物探,2008,47(3):266-271.
[10]崔永谦,秦凤启,卢永和,等.河流相沉积储层地震精细预测方法研究与应用:以渤海湾盆地冀中坳陷古近系河道砂为例[J].石油与天然气地质,2009,30(4):668-672.
[11]李春光.试论渤海湾盆地油气富集规律与勘探[J].海相油气地质,2006,11(3):4-14.
[12]朱筱敏,王贵文,孙洪斌,等.辽河滩海地区下第三系层序地层学研究[M].北京:石油工业出版社,2000:5-6.
[13]林承坤,陈钦峦.荆江河曲成因与演变[J].南京大学学报:自然科学版,1965(1):97-122.
[14]左东启.黄河河道格局的历史演变及其对现代治黄思路的启示[J].水利水电科技进展,2001,21(4):3-11.
[15]崔承琦,孙晓霞,施建堂,等.近代黄河三角洲海岸发育体系:黄河三角洲潮滩海岸时空谱系研究[J].海洋通报,2001,20(5):31-39.
[16]李庆忠.河道解释中的陷阱[J].石油地球物理勘探,1998,33(3):272-278.
[17]李庆忠.近代河流沉积与地震地层学解释[J].石油物探,1994,33(2):26-41.
[18]孟卫工.辽河滩海地区东营组沉积特征与沉积演化[J].石油天然气地质,2010,31(5):567-575.
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