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SEISMIC FACIES OF PALEOGENE-NEOGENE IN THE QAIDAM BASIN

Haidong Li

Abstract

Paleogene-Neogene in the Qaidam basin can be divided into 7 level Ⅲ sequences based on the seismic reflections terminal relations and geological background in Tertiary Period. According to internal reflection texture and external geometric configuration, there are 7 seismic facies identified, with the help of amplitude and continuity, on the Paleogene-Neogene seismic reflection profile of studying area including parallel sheet seismic facies, sub-parallel wave seismic facies, progradational reflection facies, filling facies, hummocky facies, lens seismic facies and wedged facies. The distribution and evolution of seismic facies are controlled by evolution of depositional system and the seismic facies interpretation bounded by logging and drilling data can show the evolution of ancient depositional system in the western Qaidam basin again.

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Key concepts: Facies, Paleogene, Geology, Neogene, Structural basin, Sedimentary depositional environment, Paleontology, Reflection (computer programming)