Abstract:The exploration and development potential of YingXiongLing shale oil in the Qaidam Basin is huge, but the work on Cyclostratigraphy is relatively weak at present, This article conducts a spectral analysis of four wells in the upper section of the Lower Ganchaigou Formation, which is developed in the YingXiongLing shale, Based on the results of core analysis, logging, and geochemical analysis, multiple sets of Milankovitch cycles in this set of strata have been identified, Based on 404.858ka long eccentricity period, the "floating" astronomical scale of YingXiongLing shale is established. It is estimated that the sedimentary time of the upper member of the Lower Ganchaigou Formation is 4.86Ma, and the average sedimentary rate is 340.44m/Ma, It has been clarified that high sedimentation rate is one of the important characteristics of the YingXiongLing shale. The sedimentary response characteristics of Total organic carbon content based on the long eccentricity period analysis show that the organic carbon enrichment degree of the YingXiongLing shale in the Qaidam Basin is controlled by the sedimentary rate, With the increase of deposition rate, the content of Total organic carbon increases. When the deposition rate exceeds 450m/Ma, Total organic carbon decreases significantly due to the dilution effect of debris. The sedimentary structure response model established based on the precession period found that when the precession parameter is at the minimum value, the main development is poor organic matter layered limestone, while when the precession parameter is at the maximum value, the main development is rich organic matter Laminated limestone. The obvious orbital forced response exhibited by the YingXiongLing shale will help predict favorable sections of shale oil and provide some new ideas for efficient exploration and development of YingXiongLing shale oil in the future.
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