Evidences of Multi-Episodically Paleo-Fluid Flow and Its Significance in Ordovician of Guchengxu Uplift,Tarim Basin
Lu Ziye
Chen Honghan
Feng Yong
Wu You
Xiong Wanlin
Shang Pei
Abstract：There is significant relationship among deep paleo-fluid flows and modification of carbonate reservoirs and hydrocar-bon migration and accumulation.In this study,11 samples of the Ordovician in Guchengxu uplift have been employed to make diagenetic observation and fluid inclusion measurement.The analyzed results indicate that there are three events of paleo-fluid flows in the Middle and Lower Ordovician of Guchengxu uplift.(1)The first event of paleo-fluid flows is represented by the first generation of calcite cement filling in high angle and meshy fractures.It is estimated that the calcite cement precipitated during late Caledonian tectonic movement.(2)The second event of paleo-fluid flows is represented by the second generation of hydrothermal dolomites.It is estimated that the saddle dolomite precipitated during the Permian volcanic activities.(3)The third event of paleo-fluid flows is represented by the third generation of calcite cement filling in the central residual spaces of the fractures and vugs.It records the gas accumulation during the later Himalayan.The bitumen distributed along the side of first generation calcite cement implies that the early charging oil accompanied with the first event of paleo-fluid flow had been dam-aged.The second event of paleo-fluid flow played a role of dolomitization which was in favor of the Ordovician reservoir im-provement.The third event of paleo-fluid flow is associated with natural gas filling.It is concluded that the later Himalayan charging natural gases are the favorable exploration target in this area.
Keywords：Tarim basinGuchengxu upliftOrdovicianpaleo-fluid flowfluid inclusionpetroleum geologystratigraphy
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 1529-1537 )