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地质学报  2006 

鄂尔多斯盆地南部延长组浊积岩体系及油气勘探意义

, PP. 656-663

Keywords: 鄂尔多斯盆地南部,坡移浊积扇,滑塌浊积扇,形成机制,油气勘探意义

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Abstract:

鄂尔多斯盆地南部的浊积岩体系主要发育于三叠系延长组长7、长6油层组。按其沉积特征可分为坡移浊积扇和滑塌浊积扇,前者相带发育相对齐全,垂向上多期互相叠加,可划分为:斜坡―槽道―内扇相、辫状水道、辫状水道间、辫状水道前缘―中扇相、外扇相和盆地平原相,后者多呈透镜状夹于较深湖亚相的深灰色泥岩中,相带分异不明显,仅可分为中心相和边缘相。两类浊积扇主要分布在近源斜坡带及远源末梢斜坡带。滑塌浊积岩主要由阵发性的偶然因素诱发而成,规模相对较小,储集物性较差;而坡移浊积扇则与地形坡度的有利配置和较稳定的物源补给有关,其沉积厚度大,分布广,储集物性好,是深湖区岩性油藏勘探的主要目标。

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