Seismic Attribute Analysis And Reservoir Sedimentary Characteristics Of Heidimiao Oil Layer In Pu A Well Area

Seismic attribute analysis technology is a seismic data processing technology discovered and gradually developed in the 20 th century in the phenomenon of reflection amplitude changes caused by abnormal changes in gas sandstone wave impedance.Overall,seismic attribute analysis is the process of extracting and optimizing the physical and mathematical properties of underground media from seismic data through mathematical methods.Seismic attributes imply formation lithology,reservoir physical properties,fluid types,and fault information.Among various geophysical methods for exploring oil and natural gas,seismic attribute analysis has become a crucial geophysical method.This article takes the seismic data of the Pu A well area in the northern part of the Songliao Basin as an example.Firstly,it combines geological research and well seismic data to study the sedimentary characteristics within the area,and focuses on analyzing the main characteristics of the underground reservoirs in the area,in order to determine the main process and methods for processing the underground thin layers.Secondly,use core samples and logging curves to analyze the sedimentary microfacies and reservoir development status in the study area.Then,seismic attributes are extracted through relevant software,and sensitive attributes of each small layer are selected based on the geological significance of each attribute and logging data.Favorable sedimentary facies zones are determined and divided through single well sedimentary facies comparison.Then,in order to reveal the geometric characteristics and microscopic characteristics of the underground target layer,the sparse pulse impedance inversion is constrained to interpret the blocks with no wells and few wells,and geostatistics inversion is carried out in the blocks with rich well data to identify and improve the vertical resolution.Finally,favorable sedimentary facies are found and the reservoir is precisely predicted by combining the oil testing data,attribute analysis and inversion results.After the above processing,the oil and gas water relationship analysis was conducted on the oil and gas layers of the Heidimiao 1 and Heidimiao 2 formations(with the H I group divided into 6 sub layers and the H II group divided into 4 sub layers)to determine the reservoir formation mode and type.Finally,favorable blocks of the Heidimiao oil layer were summarized,classified,and evaluated for development potential.