Construction of the high-resolution sequence framework in the Qigequan region,Qaidam Basin,Qinghai

The high-resolution sequence framework is constructed for the Qigequan region,Qaidam Basin,Qinghai on the basis of both the classical theory and fundamentals of sequence stratigraphy by Vail and high-resolution sequence stratigraphic theory and method by Cross.The division and correlation of the high-resolution sequences show that the lower member of the Lower Ganchaigou Formation(E₃¹) is built up of five 5th-order sequences from SSC1 to SSC5 in a descending order,and the upper member of the Lower Ganchaigou Formation(E₃²) consists of six 4th-order sequences from MSC1 to MSC6 in a descending order.The results of research in this study may deliver important geological information for the petroleum exploration in the Qigequan region.