| Penglai 19-9 oilfield is located in the south-central part of Bohai Sea.The oilfield has well developed faults,complex structure,fast lateral change,many thin single reservoirs.For the above reason seismic reservoir prediction is very difficult.Guided by the sequence stratigraphy theory,this paper established a sequence stratigraphic framework of well-seismic integration with high resolution,and studied the sedimentary characteristics and sedimentary microfacies characteristics of the study area by comprehensive application of core,logging,seismic,analytical testing and dynamic data.The sensitivity of sandstone and mudstone in the study area was analyzed by forward simulation,and the characteristics of different types of attributes are summarized,the mudstone barrier identification char was made.Stratum slices,frequency division stratum slices and multi-attribute analysis method based on neural network are used to predict the horizontal distribution of sand bodies in the study area,and the vertical distribution and connectivity of sand bodies in the study area are depicted.Braided River delta front deposits are developed in Guantao Formation of Penglai19-9 oilfield.The main sedimentary microfacies are underwater distributary channel and bay,and estuary bar is rare.The Guantao Formation sand body in the study area is lobular in plane and extends from northwest to southeast.The width of underwater distributary channel is between 80 m and 150 m,and the thickness of sand body is between 4m and13 m.Sand bodies are well connected along the source direction.They are flaky.And the sand bodies in the vertical source direction are lenticular.Through frequency division stratigraphic slicing,seismic multi-attribute analysis and other techniques,horizontal section interaction,well-seismic integration,the favorable reservoir zones of different layers are divided,which effectively guides well location deployment and provides geological basis for further development of oilfields. |
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