Identification of Strike-Slip Faults and Exploration Breakthroughs in the Fuman Area,Tarim Basin
Strike-slip fault zones well-developed in the Fuman area within the Aman transition zone of the Tarim Basin.These faults significantly impact the reservoir characteristics and hydrocarbon accumulation in the Ordo-vician carbonate rocks.However,identifying strike-slip faults in the Fuman area remains challenging.Using new 3D seismic data from the Fuman area,this study has identified and characterized primary and secondary strike-slip faults through multiple filtering,coherence analysis,and signal decomposition techniques.Addition-ally,a quantitative standard for classifying strike-slip faults has been established.Furthermore,the exploration potential of the strike-slip faults has been evaluated using the"three determination"approach.The results show that 70 large-scale strike-slip faults are developed within the Tabei Uplift and Central Uplift belts.Based on their development lengths,activity periods,and intensity,the primary strike-slip faults are classified into ClassⅠ(25 faults)and Class Ⅱ(45 faults).In the Fuman area,34 major strike-slip faults have been identified.Based on fault characterization and drilling data,the"three determination"method,encompassing the determi-nation of faults system,fracture-cavity boundaries,and reservoir units,is proposed for evaluating resources in the Ordovician carbonate reservoirs.The resources associated with the 70 strike-slip faults include 20 x 108 t of oil and 1 x 1012 m3 of gas,with 11 x 108 t of oil located specifically in the Fuman area.Based on detailed char-acterization of the strike-slip faults,three new structural belts with abundant oil and gas resources have been identified and confirmed by wells.The study indicates that strike-slip faults of various scales in the Fuman area hold significant potential for increasing reserves and production.This study not only advances research on strike-slip faults and the exploration of fault-controlled fractured-vuggy carbonate reservoirs in the Tarim Basin platform area but also provide valuable guidance for studying strike-slip faults in other cratons.
万方数据
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