Cenozoic Sedimentation And Structure Of Tainan 9 Well Area In Sanhu Depression, Qaidam Basin

For Tainan 9 Well Area of SanHu Depression in Qaidam Basin has undergone the Himalayan movement and the late Quaternary Neotectonics, and controlled by the distribution of the basement structure in the basin, it can form the structural styles at present, and the tectonics are mainly synsedimentary anticline structures.This thesis deals with the sedimentary facies through logging, paleontology, petrophysical data, core sampling data and so on. The author, in this thesis, has tried the seismic interpretation in the high-resolution seismic lines, finished the fine structure modeling and established the fine structural model for the research area. The major characteristics of Cenozoic sedimentation and Structures in the Tainan 9 Well Area are:Lake formation phase (E₁₊₂-N₂³): from Paleocene to the Pliocene, three lakes depression has not yet formed; the late Pliocene (N₂²), Qaidam Basin by the early Himalayan movement began to uplift to the northwest, deposition center changed from a YiLiping to the Three Lakes, so the lake formed.Lake peak phase (N₂³-Q₄): In the late Pliocene to early Pleistocene, due to the subduction of the Indian plate and the Tibetan Plateau increased substantially, resulting in the center of Qaidam basin rapidly eastward to three lake areas, for strike-sliping occurs by the extrusion subsurface, mid-Pleistocene lake basin reached its peak, accepted the thick lacustrine deposits, the lake reached its peak phase.Lake extinction phase (Q₄-now): The Holocene tectonic movement caused the Qaidam Basin to uplift, and shallow the lake water, only residual salt lakes, swamps, over time, the lake will disappear.