Developmental Characteristics of Turbidite and Its Implication on Petroleum Geology in Late-Triassic Ordos Basin
Developmental Characteristics of Turbidite and Its Implication on Petroleum Geology in Late-Triassic Ordos Basin
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发表时间：
2008
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通讯作者：
Liu Yong-dou
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作者：
Liu Yong-dou
鄂尔多斯盆地三叠系延长组Ch 7、Ch 6段深湖区发育不等厚的浊积岩砂体，通过对Ch 6-Ch 7钻孔岩芯的沉积相特征、岩石结构、构造产状等的综合研究，认为浊积岩是三角洲前缘滑坡的产物，浊积岩主要有两种类型：粗粒滑塌浊积岩主要发育于辫状河三角洲前缘，碎屑物源来自西南方向;细粒滑塌浊积岩主要发育于曲流河三角洲前缘，其碎屑物源来自西北方向，弄清鄂尔多斯三叠系湖盆浊积岩的发育分布及规律，不仅对深湖相浊积岩储层的勘探具有指导意义，而且对深湖相浊积岩油气成藏规律的研究也具有重要意义。
Unequal thickness of turbidite sandbodies are found in the deep-lake area of Triassic Yanchang Formation Ch7 and Ch6 member of Ordos Basin.Based on the integrated study of the sedimentary facies features,rock texture,structural attitude of the Ch6-Ch7 drilling core,the turbidite was caused by the delta-front landsliding.The turbidite is concluded into two types:the coarse grains fluxoturbidite was mainly developed with braid river delta-front which the clastic source was from southwest;the fine grains fluxoturbidite was mainly developed with meandering river delta-front which the clastics source was from northwest.Figuring out the developmental distribution and regular pattern of turbidite in the Ordos Triassic lake-basin not only directs the exploration of the turbidite reservoir in the deep lake,but also benefits the study on hydrocarbon accumulation of the turbidite on the deep-lake facies.