Abstract
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 the quantitative 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.
Key words
laser in situ U-Pb isotopic dating, clumped isotopic thermometry, tectonic-burial evolution, Qigebulak Formation, Tarim Basin
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Reconstruction of tectonic-burial evolution based on the constraints of laser in situ U-Pb date and clumped isotopic temperature:a case study from Sinian Qigebulak Formation in Akesu area,Tarim Basin[J]. Marine Origin Petroleum Geology. 2021, 26(3): 200-210
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