Reservoir Characterization and Comprehensive Prediction of Nonmarine Deep Water Deposits for Sha-3 Member in Xingma Area

The Xingma area is located in the mid-east of the western sag, Liaohe depression. The stratums above Sha-2 Formation have been confirmed and put into production after 40 years' exploration. With the exploration and research in depth, the gravity flow of deposited sand bodies of Sha-3 member becomes a focus in lithologic reservoirs exploration. Due to low dominant frequency, low signalto -noise ratio, rapid lateral change, and high frequency of layering inter -bedding, the studies are few with respect to reservoir characteristic and spatial distributions. The sequence stratigrapic classification and seismic reservoir prediction skills are two effective methods in the lithologic reservoir exploration for deeper strata. The Sha -3 member is divided into three sequences after the high resolution sequence stratigraphic framework is built up. The sandstone bodies are mainly distributed at the bottom of each sequence and mostly developed in sequence SQ3. On the basis of an isochronous stratigraphic framework, the seismic attribute identification, seismic waveform classification, frequency division technique, post-stack seismic inversion, and the forecasting reservoir technique are used to choose four good lithologic traps. The prediction results are verified by the new well drilling data. The research provides a reference for lithologic reservoir exploration in western sag, Liaohe depression and other areas.