楚雄晚三叠世前陆盆地沉积-剥蚀特点

Characteristics of deposition and erosion in Chuxiong Late Triassic foreland basin

运用沉积波动分析等技术,对楚雄盆地的祥云小青坡、安龙堡、元谋洒芷、禄丰一平浪以及乌龙1井、云参1井等典型剖面进行了沉积-剥蚀特征分析,并分别建立了沉积波动方程。经分析,楚雄晚三叠世前陆盆地主要存在4种沉积-剥蚀类型,即界面型、早沉积晚剥蚀型、沉积型和早剥蚀晚沉积型。4种沉积-剥蚀类型与前陆盆地结构有很好的对应关系,造山带、逆冲推覆带、前陆凹陷带和前陆隆起带分别为界面型、早沉积晚剥蚀型、沉积型和早剥蚀晚沉积型沉积-剥蚀分布区。

Depositional wave analysis technique has been used to analyze the deposition and erosion characteristics of several typical profiles in Chuxiong basin, such as Xiaoqingpo in Xiangyun, Anlongbao, Sazhi in Yuanmou, Yipinglang in Lufeng, Wulong 1 well and Yuncan 1 well, and to establish their wave equations. There are mainly 4 depositlon-erosion types in Chuxiong Late Triassic foreland basin, including boundary type（ SB type） , early deposition-late erosion type（ T type）, deposition type （TH type）and early erosion-late deposition type（ H type）. These four deposition-erosion types are in good correlation with the architecture of foreland basin. The boundary type（ SB type）, early depsotion-late erosion type（ T type）, deposition type （ TH type） and early erosion-late deposition type（H type） are distributed in orogenic belt, overthrust belt, foreland hollow zone and foreland uplift zone, respectively.