石油与天然气地质 ›› 2018, Vol. 39 ›› Issue (6): 1201-1212.doi: 10.11743/ogg20180610
李向东1, 阙易1, 郇雅棋2, 陈海燕1
收稿日期:
2017-10-11
修回日期:
2018-08-20
出版日期:
2018-12-28
发布日期:
2018-10-22
作者简介:
李向东(1973-),男,博士、讲师,沉积学。E-mail:lixiangdong614@163.com。
基金资助:
Li Xiangdong1, Que Yi1, Huan Yaqi2, Chen Haiyan1
Received:
2017-10-11
Revised:
2018-08-20
Online:
2018-12-28
Published:
2018-10-22
摘要: 鄂尔多斯盆地西缘桌子山地区中奥陶统克里摩里组普遍发育深水等深流沉积,其中石峡谷剖面发育完整,岩性变化明显,为达瑞威尔期等深流沉积的理想剖面。以石峡谷剖面克里摩里组中段为研究对象,在详细的野外观察基础上,结合室内岩石薄片研究、相关地球化学测试和已有的研究成果,探讨石灰岩岩组与页岩互层的形成机制。结果表明:克里摩里组中段共发育10个石灰岩岩组可划分为3个旋回;单层石灰岩以不同的透镜体形态及样式尖灭于页岩之中;石灰岩中发育平行层-均匀层-平行层序列和平缓微波状条纹构造,在显微镜下表现为交替的灰泥和粉晶聚集带。结合已有研究成果综合判断认为:克里摩里组中段石灰岩与页岩组成混积层系,包含有陆源碎屑与碳酸盐混积层系及碳酸盐(陆源碎屑岩)与混积岩混积层系2种类型,可能为受天文旋回控制的深水等深流周期性溢岸混合沉积所致。克里摩里组中段深水等深流成因混积层系的发现对于鄂尔多斯盆地西缘奥陶系页岩气的勘探具有重要意义。
中图分类号:
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