Types of the Cambrian platform margin mound-shoal complexes and their relationship with paleogeomorphology in Gucheng area, Tarim Basin, NW China

ZHANG Junlong,HU Mingyi,FENG Zihui,LI Qiang,HE Xiangxiang,ZHANG Bin,YAN Bo,WEI Guoqi,ZHU Guangyou,ZHANG You

Table 1 Sedimentary models of three types of mound-shoal complexes developed on different ancient landforms in the Gucheng area.

Type of mound-shoal complex Seismic facies characteristics Characteristics of paleogeomorphology and accommodation space Sedimentary structure characteristics Sedimentary model Gentle slope symmetric accretion Uniform gentle slope Large vertical+horizontal accommodation space Symmetric accretion ''small mound and large shoal" small mound core, large mound flat, relatively large mound front + mound back Steep slope asymmetric accretion Folded steep slope Large vertical+horizontal accommodation space Asymmetric accretion ''large mound and large shoal" large mound core, relatively large mound flat, small mound front Steep slope asymmetric progradation Monoclinic steep slope Accommodation space is large in front Asymmetric progradation ''small mound and large shoal" small mound core, small mound flat, large mound front