Seismic Sedimentology And Its Application Of Putaohua Oil Formation Of Daqingzijing District In South Songliao Basin

Daqingzijing district is located in the southern part of central depression in the south Songliao basin,which is the center of Fuyou depression in Changling.The inferior quality of formation division and comparison and the misunderstanding of facies characteristics and sandbody distribution hinder the further development of oil field.Therefore,under the guidance of sedimentary background,sequence stratigraphy and seismic sedimentology are applied to construct the high-resolution isochronal formation framework and to carefully depict sedimentary microfacies.Spatial heterogenity exists in the formation distribution in the research area,which makes it difficult for Putaohua oil formation to be divided.Data including cores,well-logging and seismic and technologies including well and seismic combination,sequence stratigraphy,time-frequency analysis and frequency division are utilized to recognize and track isochronal horizon,which aims to construct the isochronal formation framework in the Putaohua oil formation.The sedimentary terrain was gentle and the formation was stable with relatively small change in the thickness,and the local thickness change resulted from the existence of fluvial sandbody.The wells are non-uniform located,exploration wells are scattered while development wells are densely dispersed in the small area,which makes it difficult to make comprehensive researches on the sedimentary facies characteristics and sandbody distribution simply depending on drilling and well-logging data.Therefore,seismic data are applied to research the microfacies within isochronal formation framework.Technologies including 90° phase shifting,strata slicing,seismic facies analysis,seismic attribute analysis and frequency division are utilized on the high-resolution seismic data and frequency division data.Combined with the result of single well facies classification,the efforts are applied to conduct the research on sedimentary facies characteristics and sandbody distribution,aiming to construct reticular fluvial delta sedimentary pattern of the research area.On the basis of distribution of favorable reservior of the target area,factors such as the reservior-forming rule,reservior forming strutrual parts,favorable traps,extant testing well and the proof of adjacent developing wells are researched to predict the favorable zone of the Putaohua oil formation.Seismic sedimentology is applied to construct the high-resolution isochronal formation framework and to carefully depict sedimentary microfacies and sandbody distribution,providing scientific basis of further development of oil field.