Fine Prediction Of Well Seismic Combined Reservoir In Pubei Fault Block In The South Of Daqing Placanticline

With the long-term development of the oilfield,Pubei Oilfield has entered the stage of high water cut development.In order to further explore effective ways to improve the development effect of the oilfield in the super high water cut stage in the old area,alleviate the problems gradually exposed in the oilfield development,such as the poor control degree of the well pattern on sand body and the poor potential tapping effect of the measures,etc.,in order to do a better job in the fine potential tapping demonstration area and deepen the understanding of reservoir geological characteristics The deployment of exploration and evaluation wells and infilling wells in fault blocks can improve the utilization of recoverable reserves.Taking the 4th to 6th fault blocks in Pubei as an example,this paper describes the spatial distribution law of interwell sand bodies under dense well pattern by optimizing and analyzing seismic attributes,and establishes the seismic recognition model of channel sand bodies.Firstly,the fine horizon calibration of synthetic records is made,and various seismic attribute prediction techniques are discussed.Among them,instantaneous amplitude,instantaneous frequency and Q value can effectively describe sandstone thickness variation and transverse discontinuity.Based on seismic records and attribute characteristics,the seismic response model of sedimentary facies is established,and the post-stack joint inversion prediction sand body technology is further improved.The accuracy of reservoir prediction is 85% when the thickness of reservoir is over 2 m.Secondly,through the fine characterization of 26 sedimentary units of Pu I group,the combined structure and drilling results of each unit are analyzed and evaluated.From the effective sandstone thickness map,it can be seen that the effective thickness of the whole Pu I group in this block is more than 5meters,and the current spacing of well pattern is 300 meters,larger than that of channel microfacies.this study considers that in the west of Pu 9-6-42 well area and south of Pu10-8-44 well area,many sedimentary units in the two blocks develop favorable sedimentary microfacies,and the well control degree has not reached 300 meters,and the wells around the two blocks still have good development effect,so the next step is in these two blocks.Assessment of edge enlargement of fault blocks deployed within blocks.Finally,combined with the distribution characteristics of remaining oil in the study area,the adjustment potential is evaluated to provide geological research basis for fine development of other oilfields.