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。
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.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2002年第4期372-375,共4页
Oil & Gas Geology
