新疆吐哈盆地侏罗系旋回地层的初步研究

PRELIMINARY STUDY ON THE HIGH-RESOLUTION CYCLOSTRATIGRAPHY OF THE JURASSIC SYSTEM IN TURPAN-HAMI BASIN, XINJIANG

应用新疆吐哈盆地侏罗系 4口井 7个组的伽玛测井资料 ,进行高分辨率旋回地层的研究。结果表明 :依据412 .9ka的偏心率旋回 ,7个组旋回堆积速率 ( AR)的平均值为 0 .15 2 9m/ka,它与北美东部上三叠统 4个组合的Mc L aughlin旋回 AR平均值 0 .16 39m/ka相接近。本区与准噶尔盆地郝家沟八道湾组的野外剖面旋回地层对比 ,两者的优势旋回量度时间大体一致。吐哈盆地侏罗纪地层中在大约 3～ 10 m厚度、相当 2 0～ 6 0 ka时间的范围内有小规模的气候变化 ;而在 5 0～ 75 m厚度、约相当 10 0和 42 0 ka的时间中 ,又会出现较大的气候变化。

Based on the high-resolution cyclostratigraphic research of the Gr logging data of 7 formations of the Jurassic System from 4 wells in the Turpan-Hami Basin, the average value of the accumulative rates of 7 formations, which have been computed according to the 412.9ka period of eccentricity, is 0.1529m/ka. It is rather near to the AR average value of Mclaughlin (0.1639m/ka), obtained from 4 associations of Upper Triassic in the eastern North America. Comparison of the results of the Badaowan Formation based on logging data in Turpan-Hami Basin with the same formation based on the field work in Haojiagou, Junggar Basin, shows that many cycles in both locations have rather common time measurements. Of the Jurassic formations in the Turpan-Hami Basin, it will have a small-scale climatic variation at ca. 3~10m, equal to the scope of 20～60ka; and a larger scale at ca. 50～75m, equal to the scope of 100ka and 420ka.