Wave Characteristics and Tectonic-Sedimentation Evolution of Chuxiong Basin in Yunnan Province

Chuxiong basin is a Mesozoic-Cenozoic petroleum basin in the southwestern margin of the Yangtze plate, which has a complex tectonic and sedimentation history. By using the analysis method of wave processes, major evolution cycles of the Chuxiong basin have been studied. This study shows that there are three first-order sedimentary cycles (220 Ma), six second-order sedimentary cycles (100 Ma), nine and a half third-order sedimentary cycles (45 Ma) and high-frequency cycles (10 Ma, 5 Ma). By comparison of the wave curves in different wave units, we gained the tectonic-sedimentation regularity: the sedimentation center in Paleozoic was in the Yunlong Depression in the eastern part of the basin. Early in the Mesozoic, the sedimentation center migrated from southwest to northeast and from basin margin to basin center. In late Mesozoic, the sedimentation center displayed a reversed migration trend from northeast to southwest.