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The Evolution Characteristics of Palaeo-Uplifts in Tarim Basin and Its Exploration Directions for Oil and Gas

WU Guanghui1,2,LI Qiming1,XIAO Zhongyao2,LI Honghui1,ZHANG Liping1 and ZHANG Xianjun2(1.Research Institute of Exploration and Development,CNPC,Beijing 100083,China;2.Research Institute of Exploration and Development,Tarim Oilfield Company,PetroChina,Korla 841000,Xinjiang,China)  
Based on the structure interpretation and the analysis of regional tectonic setting controlling on oil,it indicates that multi-cycle tectonic movement and migration of palaeo-uplifts had occurred in Tarim basin.It includes six stages of evolution:the commence of basement lift in the Precambrian,the formation before the end of Early Ordovician,completion before the end of Ordovician,modification during Silurian-Devonian,local regulation during the end of Permian,tectonic station during Mesozoic.The evolution of palaeo-uplift was characterized by multiple epoches,inheritance,migration and modification and formed three large Palaeozoic palaeo-uplifts which were dominated by the lower Palaeozoic carbonate,including the central uplift,the northern uplift and the southwestern uplift.The uplifts forming in the Palaeozoic controlled the hydrocarbon distribution in the platform-basin region.The polycyclic tectonic movements together with three stages of hydrocarbon migration and accumulations,resulted in the vertical overlap of the producing layer,reservoir rock,multi-phase and multi-type of oil reservoir,and then formed a complex petroleum accumulation zone in the palaeo-uplifts.The slopes of the Palaeozoic uplifts are the main exploration orientations in Tarim basin.The Paleao-uplifts evolution analysis showed that there exists a large Palaeozoic uplift which submerged in the late Himalayan in Migaiti slope,southwestern Tarim basin.The Ordovician karst reservoir and the Carboniferous mud cap rock formed a high-quality reservoir-cap assemblage in the uplift with the Hercynian hydrocarbon and oil accumulation and the Himalayan gas accumulation.Thus,the southwestern uplift is a potential exploration domain after the discovery of the big oil/gas fields in the uplift in the north and centrel of Tarim basin.
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