石油与天然气地质 ›› 2002, Vol. 23 ›› Issue (4): 372-375.doi: 10.11743/ogg20020415

• 油气空间 • 上一篇    下一篇

鄂尔多斯盆地上三叠统延长组米兰科维奇旋回的确定

张小会, 赵重远   

  1. 西北大学地质系, 陕西西安, 710069
  • 收稿日期:2002-09-24 出版日期:2002-12-25 发布日期:2012-01-16

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

Zhang Xiaohui, Zhao Zhongyuan   

  1. Department of Geology, Northwest University, Xi'an, Shaanxi
  • Received:2002-09-24 Online:2002-12-25 Published:2012-01-16

PDF (PC)

1253

被引次数

43

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。

关键词: 米兰科维奇旋回, 延长组, 沉积速率

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.

Key words: Milankovitch cycles, sedimentation rate, Yanchang Formation

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