A Case Study of Facies-Control Geostatistical Inversion Method in Bohai Bay
X.Y. Duan · 83rd EAGE Annual Conference & Exhibition · 2022
Summary Because of fluvial facies and shallow delta facies sedimentary environments, over 95% Neogene oilfields of Bohai Bay are complex lithology reservoirs with the phenomena of serious channel sand bodies overlaying and rapid reservoir thickness variation. It is a big challenge to recognize reservoirs’ thickness and forms in common reservoir characterization results, which will then have large effect on the following exploration evaluation and oilfield development. Normal seismic stochastic inversion (SI) can effectively integrates priori statistical information, seismic and well-logging data to obtain a higher resolution reservoir characterization result, but it requires a considerable large number of wells and accurate frame model. Because of the special well distribution of offshore oilfield, it is hard to obtain nice SI results using without accurate interpretation horizons or in sparse well area. So a frequency division constraint seismic stochastic inversion method is presented in this paper, which can characterize reservoir thickness and predict the overlapping relationships of channel sands accurately. Its successful application in Bohai Bay indicates that it is an effective reservoir characterization method in complex area of offshore oilfield, and it can provide important reference for the following exploration well design and oilfield comprehensive adjustment.