岩性油气藏 ›› 2023, Vol. 35 ›› Issue (5): 120130.doi: 10.12108/yxyqc.20230512
魏嘉怡1,2, 王红伟1,2, 刘刚1,2, 李涵1,2, 曹茜1,2
WEI Jiayi1,2, WANG Hongwei1,2, LIU Gang1,2, LI Han1,2, CAO Qian1,2
摘要: 根据钻井、录井、测井及地震资料,结合岩石矿物特征、古生物化石以及地球化学特征,对鄂尔多斯盆地西缘石炭系羊虎沟组沉积相特征和展布规律进行了系统研究。研究结果表明: ①鄂尔多斯盆地西缘羊虎沟组岩性以泥岩、炭质泥岩、煤层为主,间夹泥质粉砂岩、砂岩,形成于海陆过渡相沉积环境,沉积期古气候为温暖潮湿气候。靖远组—羊虎沟组沉积期,湖盆水体盐度逐渐增大,古气候从早期的温湿气候向干热气候过渡,沉积环境由早期的氧化环境向中、晚期的氧化—还原环境过渡,相对古水深由小向大过渡,至羊虎沟组沉积晚期,发生快速水退。②研究区羊虎沟组以混合沉积为主,发育三角洲—障壁海岸—滨浅海等沉积体系,属于典型的海陆过渡相。韦州—石沟驿地区发育澙湖—障壁岛沉积相带,总体可分为两大区域性海进、海退旋回,下部海进旋回以海湾—潮坪沉积为主,上部海退旋回以三角洲沉积为主。③羊虎沟组沉积水体较浅,周边发育三角洲,内部障壁砂坝较发育,形成了有利沉积相带,垂向上靖远组—羊虎沟组为海湾—潮坪—障壁岛—澙湖—沼泽相的区域海进—海退沉积旋回。
中图分类号:
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