Well Seismic Combined With Channel Sand Body Prediction In The Coring Well Area Of A Block In Daqing Changyuan

With the gradual deepening of exploitation and tapping potential,the requirements for the fine quantitative description of the longitudinal and plane heterogeneity of the remaining oil reservoirs are getting higher and higher.We cannot simply rely on the well data to solve the problem of multiple solutions to the understanding of the sand body in the well and the multiple solutions of the combination of the typical sand body plane microfacies.The Pul-3 oil layer which in the block of Daqing Changyuan has now entered the follow-up water drive development stage.Some coring wells have been drilled in the local area,which is mainly used to study the distribution of residual oil after chemical flooding.In this paper,the small area coring wells is as the target area.First,the interface of sedimentary unit demarcated by well logging data is calibrated and verified by various interfaces of cores,determine the vertical distribution of reservoir characteristics.Then,on the premise of guaranteeing the accuracy of the contrast boundary,the surface Q Compensation,Pulse Deconvolution and Viscoelastic Pre-stack Migration are applied to pre-stack seismic data,exploration and application of various methods,such as seismic attributes,waveform inversion and geostatistical inversion,focus on understanding the distribution of channel sand bodies,research on the development of interwell sand body and the prediction of the relationship between the plane sand body composition and so on.Finally,a set of reliable well seismic combined reservoir fine depiction method suitable for this block is formed.It provides geological basis for following up the distribution of residual oil and guiding the adjustment and tapping of oil fields.It is more accurate to depict the facies map of the data in the study area.Well seismic combination further deepens the reservoir understanding.In general,the sand body is more scattered,especially the discontinuity of the underwater distributary channel,the sand distribution area in the water on the river,the river sand and the river boundary clearer.The seismic attribute slice technique has certain limitations under the condition of the specific reservoir distribution and reservoir structure in this area,and the curve reconstruction geo statistical inversion technique is more adaptable in this area;the effect of waveform inversion technique is better than the attribute slice,but it is excessively dependent on the dense well network material and is strongly restricted by the well data.It is also needed to be applied and verified in other low density well pattern blocks.