鄂尔多斯盆地米兰科维奇旋回在延长组发育的一致性

Uniformity of the Milankovitch Cycle developed in the Yanchang Formation in east Gansu with the Milankovitch Cycle developed in other areas in Ordos Basin

通过高分辨率基准面旋回和测井曲线的频谱分析研究,认为在鄂尔多斯盆地陇东地区延长组湖相碎屑岩地层中,沉积旋回的周期变化可以反映米兰科维奇旋回.该旋回与鄂尔多斯盆地靖安油田和陕北地区延长组中的米兰科维奇旋回相对比,存在着较好的一致性,表明同时期的米兰科维奇旋回沉积记录,可以在鄂尔多斯盆地相距很远的不同沉积区同时发育.由于受区域性乃至全球性气候的制约,该旋回同时发育于鄂尔多斯盆地延长组的不同沉积地点及不同沉积相区,从而进一步支持米兰科维奇理论.

According to the study on the high-resolution base-level cycle and the spectrum analysis of logging curves,it is held that the sedimentary cycles in the Yanchang Formation in east Gansu,Ordos Basin is uniform with Milankovitch cycles.There is the uniformity between the sedimentary cycles and the Milankovitch cycles developed in Jing'an oilfield and the Yanchang Formation in north Shaanxi,Ordos Basin.This shows that the coetaneous sedimentary record of Milankovitch cycles may be found in different areas from long distance.Because of the restriction of regional and even global climate,Milankovitch cycles are developed in the Yanchang Formation in different sedimentary sites and sedimentary facies areas,Ordos,which further supports Milankovitch Theory.