Research On Putaohua Reservoir In PuPB Block Of Putaohua Oilfield

Putaohua Oilfield is geographically located near the junction of Daqing City and Zhaoyuan County,and structurally located in the tertiary structure of the southern Daqing Placanticline secondary structural belt in the central depression of the Songliao Basin-Putaohua Structure.It is an old oilfield that has been developed for decades.In recent years,continuous water injection development has gradually increased the comprehensive water content of the oilfield,making it difficult to maintain stable production due to rapid decline in oil production.In order to identify favorable target areas for well layout and effectively improve the drilling success rate,research was conducted on Pu PB Block in Putaohua Oilfield.This study adopts the method of combining seismic data and well point data,and uses seismic data to carry out prediction and analysis of reservoir seismic attributes in the study area,in order to find potential zones for external expansion of oil and gas accumulation.Firstly,seismic forward modeling,seismic coherence processing,and seismic phase analysis are used to study the seismic attributes in the target area.Through seismic attribute extraction and seismic attribute processing techniques,11 seismic attributes such as seismic arc length,amplitude average energy,and average instantaneous frequency are extracted for the upper,middle,and lower segments of the oil layer in the target block,Through seismic attribute optimization and correlation analysis,it is found that the seismic reflection coefficient in this area has the highest relative resolution and the best reliability.After conducting seismic attribute accuracy analysis with 21 evaluation wells with representative sandstone interpretation thickness in the study area,the average accuracy obtained through comparative analysis is relatively high,meeting the requirements for seismic attribute prediction accuracy in this study.Then,study the sedimentary microfacies of the target block,and simulate the thickness plan of each small layer through the prediction of the small layer reservoir plane.Using the ratio of the thickness of the small layer sandstone to the thickness of the small layer stratum,prepare a plane distribution map of the small layer sand to ground ratio.The characteristics of the sedimentary evolution history are summarized through research on the terrain,climate,provenance,and other sedimentary environments of the main reservoir forming periods.Finally,based on the previous geological research results,determine the potential for oil reservoir expansion and select multiple favorable potential blocks.