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鄂尔多斯盆地红河地区长8段沉积相与砂体展布

Keywords: 长8段,沉积相,砂体展布,三维地震,古流向,储层预测

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Abstract:

?三叠系延长组长8段是鄂尔多斯盆地西南部主要产油层之一.前人根据露头、钻井资料的矿物成分和含量统计认为长8段为南西—北东走向的三角洲前缘分流河道沉积.以往通常是将有利的河道砂岩储层描述为南西—北东向延伸的直线状.但首次获得镇泾地区南部红河三维地震资料后,综合钻井资料得出了多种方向、形态的主河道砂体展布.结合区域长8段地层的展布、古构造和湖泊发育状况,认为红河三维地震区的长8段为辫状河—曲流河沉积,河道砂体宽厚比为1/500~1/1000,长8段河道呈南东、南北、近东西多种方向,优质储集体为心滩式纵坝砂体,漫滩及河道边部砂体物性较差.镇泾地区长8段湖相及三角洲相沉积不发育.

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