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Buried Diagenesis,Structurally Controlled Thermal-Fluid Process and Their Effect on Ordovician Carbonate Reservoirs in Tahe,Tarim Basin

LI Zhong1 HUANG Si-jing2 LIU Jia-qing1 CAI Chun-fang1 LI Yue-jun1LI Kai-kai1 HAN Yin-xue1 ZHAO Yan1(1.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029;2.Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059)  
The understanding for layered weathering crust model once sustained oil and gas exploration of the Lower Paleozoic deep-buried carbonate in the Tarim Basin.However,strong heterogeneous characteristics of the carbonate reservoir types increases exploration risk in the study area.As a case study,The Middle-Lower Ordovician carbonate reservoirs of Tahe area,Tarim basin,are studied in this paper,with focuses on superposition effect of burial diagenesis and structurally controlled thermal-fluid,on reservoir formation.Finally,combined with other elements including epigenetic karst process and so on,a comprehensive explanation on reservoir distribution is given in this research.The main recognition includes:① Normal deep-buried diagenesis of Ordovician carbonates mainly resulted in precipitation rather than dissolution,and constructive modification primarily related to the epigenetic karstification(paleo-karst)or structurally controlled thermal-fluid flow and led to strong heterogeneity of carbonate reservoirs.② From the Lower Ordovician to Upper Ordovician,thermal fluid flow evidence in the lower carbonate strata is stronger than that of the upper carbonate strata.③ The constructive modification of structural-thermal fluid flow in Ordovician carbonate mainly occurred in structural intersection of superimposed faults developed during Middle-Late Devonian and Permian,respectively,and the strong pre-existed epigenetic karstification area formed at Middle-Late Ordovician and pre-Carboniferous periods.The most efficient carbonate reservoirs have limited genetic relation with high-energy depositional facies in the study area.This paper puts forward a conceptual model about structural-geofluid processes and related reservoir formation for the Ordovician carbonates in Tahe area,which provides a new clue for further understanding formation and distribution of the studied reservoirs.
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