基于保幅纯波的多属性模型回归在储层描述中的应用——以准西车排子地区沙一段1砂组为例
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摘要
车排子地区沙一段1砂组储层较薄且结构复杂,受地震资料分辨率的影响难以直接识别与描述。基于保幅纯波数据,尝试以均方根属性描述储层分布范围,以振幅平方差属性描述有利储层的发育范围。同时,结合属性独立性分析与储层厚度-属性相关性分析,优选出多个敏感属性进行储层厚度模型回归,对研究区的有利储层空间展布进行了精细刻画。预测结果认为,研究区存在东北、西北、西南3个可识别的物源。受其影响,沙一段1砂组储层厚度主体自南北向中间逐渐减薄,且平面上存在大面积不同物源砂体的交汇区,造成研究区沉积、储层岩性及组分变化较快。
It's difficult to directly identify and describe Sand Bed 1 of Member S1 of Chepaizi area due to its thin bed,complex structure and the influence of seismic data resolution.The paper presents the efforts of describing reservoir distribution range by using mean square root and describing the development range of favorable reservoirs by using amplitude square difference based on preserved amplitude pure waves.Meanwhile,in combination of the analyses of attribute independence and of the relativity of reservoir thickness and attributes,several sensitive attributes are optimally selected and therefore reservoir thickness model is regressed;and the spatial distribution of favorable reservoirs in the study area is finely depicted.The study result believes that there exist identical sources in EN,WN and WS in the study area.Influenced by this,the thickness of Sand Bed 1 of Member S1 diminishes gradually from SN to middle area;there exists the intersection of sand bodies of different material sources in a large lateral area,therefore causing the rapid variation in sedimentation,lithology and composition in the study area.
It's difficult to directly identify and describe Sand Bed 1 of Member S1 of Chepaizi area due to its thin bed,complex structure and the influence of seismic data resolution.The paper presents the efforts of describing reservoir distribution range by using mean square root and describing the development range of favorable reservoirs by using amplitude square difference based on preserved amplitude pure waves.Meanwhile,in combination of the analyses of attribute independence and of the relativity of reservoir thickness and attributes,several sensitive attributes are optimally selected and therefore reservoir thickness model is regressed;and the spatial distribution of favorable reservoirs in the study area is finely depicted.The study result believes that there exist identical sources in EN,WN and WS in the study area.Influenced by this,the thickness of Sand Bed 1 of Member S1 diminishes gradually from SN to middle area;there exists the intersection of sand bodies of different material sources in a large lateral area,therefore causing the rapid variation in sedimentation,lithology and composition in the study area.
引文
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[2]曹鉴华,张学丰.YQ地区奥陶系碳酸盐岩岩溶储层地震属性预测[J].特种油气藏,2012,19(2):42-46.
[3]沈扬,贾东,赵宏亮,等.准噶尔盆地西部车排子凸起新近系沙湾组成藏体系与富集规律[J].地质通报,2010,29(4):581-588.
[4]汪云家,王兴谋,韩文功.济阳坳陷三维地震资料中亮点气藏的特征及识别方法[J].石油物探,1995,34(4):66-72.
[5]朱桂娟,陶庆学,王娟,等.基于最佳时窗刻画技术的河道相储集砂体识别——以港西油田为例[J].勘探地球物理进展,2009,32(3):207-212.
[6]万琳.地震属性分析及其在储层预测中的应用[J].油气地球物理,2009,74(3):43-46.
[7]詹正彬,姚姚.多波及横波地震勘探[M].北京:地质出版社,1994:12-20.
[8]白宝玲,赵洪州.地震多属性综合分析技术在储层预测中的应用[J].石油天然气学报,2010,32(1):246-249.
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