Trend judgment of abandoned channels and fine architecture characterization in meandering river reservoirs: A case study of Neogene Minhuazhen Formation NmⅢ2 layer in Shijiutuo bulge, Chengning uplift, Bohai Bay Basin, East China

NIU Bo,ZHAO Jiahong,FU Ping,LI Junjian,BAO Zhidong,HU Yong,SU Jinchang,GAO Xingjun,ZHANG Chi,YU Dengfei,ZANG Dongsheng,LI Min

Fig. 5. Different combination relationships between sand-mudstone interface and horizon well trajectory. (a) Well trajectory ascends from sandstone to mudstone, and the tendency of sand-mudstone interface is consistent with well trajectory; (b) Well trajectory descends from sandstone to mudstone, and the tendency of sand-mudstone interface is consistent with well trajectory; (c) Well trajectory ascends from mudstone to sandstone, and the tendency of sand-mudstone interface is consistent with well trajectory; (d) Well trajectory descends from mudstone to sandstone, and the tendency of sand-mudstone interface is consistent with well trajectory; (e) Well trajectory ascends from sandstone to mudstone, and the tendency of sand-mudstone interface is opposite to well trajectory; (f) Well trajectory descends from sandstone to mudstone, and the tendency of sand-mudstone interface is opposite to well trajectory; (g) Well trajectory descends from mudstone to sandstone, and the tendency of sand-mudstone interface is opposite to well trajectory; (h) Well trajectory ascends from mudstone to sandstone, and the tendency of sand-mudstone interface is opposite to well trajectory.