Seismic forward modeling of tight sandstone reservoir
Seismic forward modeling is an essential part of seismic reservoir prediction.There are relatively few for-ward modeling studies for tight sandstone reservoirs and insufficient understanding of reflection characteristics.With the concealment of exploration and development,it is necessary to strengthen the understanding of the development characteristics of tight sandstone reservoirs.In response to this problem,this paper takes C8 oil formation of H oil-field as an example to carry out the forward modeling research of tight reservoir,and the following results are ob-tained:1)The relationship between sandstone thickness and seismic attributes is affected by the impedance difference between sand sandstone and mudstone.The amplitude obviously changes with the thickness when the impedance difference is large,and the amplitude variation with sand thickness decreases when the impedance difference decrea-ses.2)There is a critical porosity of 0.08 when the porosity is less than 0.08,the sandstone corresponds to wave crest and wave trough,and the amplitude decreases with the increase of porosity;the impedance of sand and mud-stone is equal,and the amplitude is zero when the porosity is equal to 0.08;the polarity reverses when the porosity is greater than 0.08,the sandstone corresponds to the trough peak,and the amplitude increases with the increase of porosity.3)The seismic phase axises of the forward modeling results of the river channels show that a single com-posite river channel is characterized by undercutting with flat top and convex bottom and edge convergence;the lon-gitudinal cutting and overlapping of the two river channels is characterized by undercutting and edge convergence in late river cutting;the lateral cutting and overlapping of the river channels shows that the early composite river chan-nel is cut by the late river channel,and the late composite river channel is completely preserved.4)The forward modeling results of the prograding complex show that the top and bottom plate reflections and the reflections on both sides form a parallelogram shape.The research results were used to predict the reservoir sand body of C8 oil forma-tion,and seven river channels were identified,laying a foundation for further reservoir prediction.
NETL
NSTL
万方数据
维普
