The Construction of Paleogene-Neogene Drilling and Seismic Matching Sequence Stratigraphic Framework in South-West Qaidam Basin

Key words: 
• sequence stratigraphic framework

Abstract: Paleogene and Neogene in Southwest Qaidam Basin are the most important oil and gas exploration and development strata of the basin. Based on the detailed sequence stratigraphy study of 54 drilling and logging data, a first flooding surface and 6 maximum flooding surfaces were identified in Paleogene-Neogene Ganchaigou and Shizigou Formations, and these surfaces can be divided into 6 third-order sequences and 17 quasi-sequence groups. Sequence correlation was done in 10 well-to-well profiles. In corresponding to these well-to-well profiles, seismic profiles were sliced in 3D seismic data, and sequence boundaries were also identified in the seismic profiles. Then the identified sequences from well-to-well profiles were projected on seismic profiles, through correlation and adjustment, high-resolution Paleogene-Neogene drilling and seismic matching sequence stratigraphic framework was constructed in south-west Qaidam Basin. This work may give insights to explore lithologic oil and gas reservoirs in this area.