A study of seismic reflection profiles and stack velocities in Qiangtang basin, northern Tibet

Abstract：This paper deals with the test conducted along two 2-D seismic reflection profiles in Longweicuo area of north Qiangtang basin, Tibet. Flows and parameters of seismic data acquisition and processing are discussed, and the main characteristics of the two profiles are interpreted tentatively. Some conclusions have been reached： there is a large-sized deep depression on the north wedge of the central uplift in Qiangtang basin; there exist obviously different reflections of structural deformation in different directions, with the basement showing strong reflections and Paleozoic strata displaying weak reflections; there also exist apparent differences between Mesozoic strata and Paleozoic strata. The authors studied stack velocity from data-processing and obtained a result consistent with the stack seismic data. Furthermore, some opinions were put forward on the structural background of a drilling hole arranged near one of the seismic profiles.