To divide the depression into seven seismic reflection layers according to the main seismic reflection nature and well-drilling data of Lishu and Dehui depressions.

• 根据梨树、德惠凹陷主要地震反射层特征，结合凹陷内钻井所揭示的地质资料，通过对两个凹陷内地震反射层的追踪对比，在凹陷内共划分出7个反射层。