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Subtle Reservoir Formation Law of Mesozoic in E'erduosi Basin
Author(s): 
Pages: 35-37
Year: Issue:  12
Journal: NATURAL GAS INDUSTRY

Keyword:  鄂尔多斯盆地三角洲河流相油藏规律储集层圈闭古地理;
Abstract: 鄂尔多斯盆地中生界隐蔽性油气藏包括两种类型:三叠系延长组三角洲油藏和侏罗系延安组古地貌油藏.三角洲生、储、盖成油地质格架是形成第一种类型油藏的有利地质条件,半深湖相暗色泥岩为伸入到生油区的三角洲沉积体提供了油源,三角洲河道、河口坝砂体是油气聚集的重要场所,储油砂体上倾方向岩性变致密成为遮挡;第二种类型油藏形成主要受控前侏罗系古地貌形态,深切延长组的古河谷是油气运移的主要通道,古地形高部位是油气运移的指向,其上形成的砂岩局部压实构造成为油气富集场所.
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