| Reliable tectonic-burial evolution curve is essential for the research on the source rock evolution, reservoirs
origin and hydrocarbon accumulating of target strata of the basin. Previous publications reported the tectonic-burial
evolution curves depending on regional geological setting, formation (denuded) thickness, and tectonic movements, which
are uncertain due to the difference in these geological understandings. For the ancient marine carbonates which went through
multicycle tectonic reformation, it is more difficult to reconstruct tectonic-burial evolution history. In this paper, based on
the identification of carbonate cements and establishment of diagenetic sequence, by coupling carbonate laser U-Pb dating
and clumped isotope（Δ47）thermometer, two understandings were obtained: (1) the tectonic-burial curves of the Sinian
Qigebulak Formation of the Tarim Basin are established under the constraints of absolute age and temperature, avoiding the
problems of uncertainty of tectonic-burial history curves in previous studies; (2) the new tectonic-burial evolution curve
provide critical reference for mapping the diagenesis-diagenetic environment-geochemical characteristics and evolution
curve and the quantitative diagenesis-porosity evolution curve, allowing thequantitative analysis of pores formation and
transformation, revealing that the pores in the Sinian Qigebulak Formation are mainly formed in the supergene environment
and gradually decrease in the burial environment due to the cementation. The proposed method is worthy of popularization
in the study of reservoir-forming and diagenetic geochronology for ancient marine carbonate strata. |
