关键词: 水驱油田, 剩余油预测, 岩石物理, 时间推移地震, 叠前反演

Abstract:

Yan’an Formation has great potential for oil and gas exploration in Mahuangshan area of western Ordos Basin．Based on the analysis of seismic data，well cores，well logging and cast slice，it is believed that Yan’an Formation experiences evolvement of incised valley filling,delta plain，prodelta，and delta plain-meandering river,so it is a whole transgression and regression cycle．Low system tract is composed of filling sandstones of incised valley，of which the distribution is controlled by Early Jurassic palaeogeomorphology，and the sandstone deposited in lower places． Transgressive system tract consists of delta plain，and maximum flooding surface lies in black mudstones of prodeha．High system tract is composed of delta plain and meandering river． Outside．source play and distal-source play are distinguished by maximum flooding surface．Filling sandstones of incised valley of low system tract have thick sandstones，high reservoirs，near resources and plentiful traps，so outside—source can trap petroleum easily ． However, distal-source plays BYe secondary reservoirs which form in high system tract and are estroyed from outside-source play.

Key words: water flood field, remaining oil prediction, rock physics, time-lapse seismic, pre-stack inversion