DEFINITION OF MILANKOVITCH CYCLES FOR YANGCHANG FORMATION OF THE UPPER TRIASSIC IN ORDOS BASIN

Zhang Xiaohui; Zhao Zhongyuan

doi:10.11743/ogg20020415

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DEFINITION OF MILANKOVITCH CYCLES FOR YANGCHANG FORMATION OF THE UPPER TRIASSIC IN ORDOS BASIN
Vol. 23, Issue 4, Pages: 372-375(2002)
Online First：25 December 2002，

Published：2002
DOI： 10.11743/ogg20020415
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DOI：

Zhang Xiaohui, Zhao Zhongyuan. DEFINITION OF MILANKOVITCH CYCLES FOR YANGCHANG FORMATION OF THE UPPER TRIASSIC IN ORDOS BASIN[J]. 2002, 23(4): 372-375. DOI： 10.11743/ogg20020415.

摘要

由天体轨道周期变化引起的气候变化被广泛地记录在沉积地层中。自然伽马曲线很好地反映了气候变化引起的地层旋回。消除高频干扰和低频趋势以后

自然伽马曲线可以用来分析地层中的米兰科维奇旋回。对鄂尔多斯盆地陕 15井中延长组按油层段进行系统分析

得出陕15井由偏心率周期引起的地层旋回厚度在9.6～18.75m之间;地轴倾斜和气候岁差周期引起的旋回层厚度在1.18～6.82m之间。各油层组的沉积速率变化在7.8～14.2cm/ka之间。

Abstract

Climate changes caused by orbital are widely recorded in sedimentary record and reflected by Gamma-ray logging data. The thickness range of stratigraphic cycles in Yangchang Formation is obtained through analyzing the Gamma-ray logging data of Shaan NO.15 in Ordos basin. The thickness range caused by eccentricity is 9.6-18.75m and the thickness range caused by obliquity of the earth's axis and climate precession is 1.18-6.82m.The sedimentation rate of various oil layers in Yangchang Formation ranges from 7.8 to 14.2cm/ka.