井—震联合下厚层辫状河三角洲前缘储层构型精细表征OA

The Ⅱ₁ of the upper member of the second member of the Dongying Formation,the main producing layer of X Oilfield,is characterized by braided river delta front deposits.With multi-stage stacked sandbodies,the prediction of sandbody boundaries is challenging,accompanied by complex remaining oil distribution and high development difficulty,thus requiring fine characterization of the reservoir architecture for this layer.Based on logging and seismic data,fine characterization of the 4th-5th order architectural elements in the study area was performed using seismic frequency-division multi-attribute fusion and natural gamma ray inversion techniques.The results indicate that the underwater distributary channel complex can be divided into three phases of channels and sand bars.A single channel has a width of 96.67-471.58 m and a thickness of 1-7 m.A single sand bar ranges from 580.50 to 2 199.57 m in length,151.31 to 733.84 m in width,and 2-7 m in thickness,with an aspect ratio of 1.01-3.84.Four stacking patterns are identified,namely vertical incision,lateral incision,vertical superposition,and lateral splicing.Verification of the distribution of architectural elements in and between wells shows that the well-seismic integrated method provides important data support for predicting the distribution of interwell sandbody architecture,which can serve as theoretical references and technical guidance for the efficient development of remaining oil in similar oilfields.