利用岩芯、测井等资料，对鄂尔多斯盆地定边东仁沟地区延长组顶部及延安组底部进行初步的地层划分对比，划分的过程中对延安组延9、延10的煤层或炭质泥岩、侏罗系与三叠系之间的不整合面等不同类型的标志层进行识别，并对其电性特征进行阐述，研究其沉积成因，从而进一步指导研究区的地层精细划分工作。延10顶部的标志层与延9顶部分布不稳定的辅助标志层将两层分开，延10底部大段砂岩与长1顶部的不整合面将三叠系一侏罗系分开。在此基础一上又将延9、延10分别分为上下两个小层。%Based on well cores and logging data, the stratum of the Dongrengou study area in Dingbian of Ordos Ba- sin is divided and correlated preliminary. During this process, it recognizes the diverse key beds, including the coal bed and carbonaceous mudstone of Yan 9 and Yan 10 and the plane of unconformity between Jurassic system and Triassic system, and states the electrical property characteristic, and studies its depositional factor, consequently fur- ther guides the fine division of the study area. The two formations, the key bed of upper Yanl0 and the auxiliary marker bed of upper Yan 9 which is unstable, distinguish the two stratums, and the large sandstone of bottom Yan 10 and the plane of unconformity of upper Changl separate Jurassic system and Triassic system. Based on these stud- ies, each of Yan9 and Yanl0 is divided into two substratums.
展开▼
