岩性油气藏 ›› 2024, Vol. 36 ›› Issue (6): 8997.doi: 10.12108/yxyqc.20240609
苟红光1, 林潼2, 房强3,4, 张华1, 李山3,4, 程祎1, 尤帆1
GOU Honguang1, LIN Tong2, FANG Qiang3,4, ZHANG Hua1, LI Shan3,4, CHENG Yi1, You Fan1
摘要: 根据自然伽马测井数据,对吐哈盆地胜北洼陷沁探1井中下侏罗统水西沟群开展旋回地层学分析和沉积噪声模拟,并利用识别出的地层中的米兰科维奇旋回信号来研究地球轨道周期对湖平面变化的驱动作用,进而进行天文旋回地层划分。研究结果表明:①吐哈盆地胜北洼陷中下侏罗统水西沟群在自然伽马曲线中可识别出12.8~51.1 m,3.0~11.9 m,1.1~3.6 m和1.3~2.4 m的沉积旋回,比例关系为21.0∶5.0∶1.5∶1.0。根据天文调谐与相关系数估算出水西沟群沉积速率为3.3~11.7 cm·ka-1。②天文调谐后的时间域序列显示水西沟群长偏心率周期为405 ka、短偏心率周期为99~131 ka、斜率周期为32.6~35.0 ka、岁差周期为20.0~24.8 ka,证明吐哈盆地中下侏罗统沉积过程受到米兰科维奇旋回控制。沁探1井八道湾组(未钻穿)、三工河组和西山窑组的持续时间分别为3.0±0.1 Ma,4.1±0.1 Ma和9.0±0.1 Ma。③地球轨道旋回对陆相湖盆的湖平面升降具有明显的驱动作用,沁探1井水西沟群的沉积噪声模拟证明了~1.5 Ma超长周期可控制台北凹陷早—中侏罗世湖平面的变化。
中图分类号:
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