Abstract:

Abstract: Seismic sedimentology is an emerging interdisciplinary subject that studies sedimentary rocks with seismic data. It is the current hot spot of international sedimentology study, and is an effective tool for mapping highfrequency sequence and depositional systems. It plays an important role in the exploration and production of thin sandstone reservoirs. There are abundant quality seismic data in Biyang Sag which features in underdeveloped faults but highly developed slump turbidite fans. The Hetaoyuan Formation in Biyang Sag is divided into five thirdorder and eight fourthorder sequences on the basis of the fundamental principles of seismic sedimentology and sequence stratigraphy. Seismic lithology study and seismic geomorphology study within highfrequency sequence stratigraphic framework are performed through 90degree phasing convention, frequency division processing, stratal slicing, and core calibration. It is confirmed that multiple provenances contributed to the development of the braided river deltaslump turbidite fan depositional system in the Hetaoyuan Formation, and the development of slump turbidite fans was controlled by the braided river delta. The geometry and distribution of slump turbidite fan sandbodies and their relation with oil and gas are defined. It is pointed out that SQ2, SQ3 and SQ4 are favorable plays of lithologic traps, and the sandbodies of delta front and turbidite fan are favorable exploration targets.