Analysis on Seismic and Sedimentation of Devonian System of South Tuoputai Area in Tahe Oilfield

In combination with the characteristics of seismic reflection events of configuration on the time section, its interval structure, continuity, oscillation amplitude, frequency and velocity, a seismic facies interpretation is carried out on the seismic data from the south Tuoputai of Tahe Oilfield. Five kinds of main seismic types of medium amplitude and medium continuity progradation facies, medium amplitude and medium continuity wedge facies, disorderly weak amplitude and weak continuity facies, sub-parallel and high amplitude medium-high continuity sheet facies, high amplitude high continuity hummocky facies are summed up. According to the characteristics of the seismic facies and in combination with structural background and drilling information are summed up. Devonian sedimentary facies is explained, the delta front, littoral facies and the neritic facies of the sedimentary facies are divided. According to the single well sedimentary facies analysis result,the north-west Donghe sandstone section littoral facies and the neritic facies deposition field and the southeast area of Donghe sandstone sharp surface end in delta front deposition are predicted as the advantageous reservoirs, by which a useful suggestion is put forward for expanding the exploration and finding beneficial target of exploration.