High Resolution Sequence Stratigraphy Feature For the Upper Ganchaigou Formation in West Qaidam Basin
ZHANG You2),3) DENG Rongjing2) LIU Nianzhou2),4) XU Bei2) (2)School of Earth and Space Science, Peking University, Beijing,100871; 3)CNOOC Ltd. (Tianjin), Tianjin, 300452; 4)Research Institute of Exploration and Development, CNPC Xinjiang Oilfield Company, Xinjiang Karamay, 834000 )
Based on Cross T.A. genetic sequence stratigraphy theory, the high resolution sequence stratigraphy for the upper Shangganchaigou Formation in West Qaidam Basin is analyzed. Through key interface recognition and logging data integrated with core analysis, the aimed segment is divided into one long term base level cycle, five intermediate term cycles and about 17 to 20 short term cycles.The deposition structure and stacking patterns,depositional faces of different level cycles in braid river-delta environment are analyzed,and also the important function of these analysis to reservoir evaluation is discussed.