Sedimentary Facies Characteristics And Reservoir Evaluation Of Leikoupo Formation In Southwestern Sichuan

Leik-oupo formation in Mid-Triassic in southern slope of western sichuan is important back-up for natural gas exploration of oil and gas field of the northwest sichuan gas field and southwest oil and gas field company.after years of exploration,there is not bigger breakthrough;Reservoir characteristics and reservoir development types which are no clear knowledge,and complexity of reservoir control factors become the difficulties of exploration.Much of Predecessors' research data concentrated on the northern section of western sichuan and sinopec blocks to discuss the characteristics of Leik-oupo formation,the study will make full use of the latest information of single well in southern Sichuan,including Sangyuan 1,Guankou 003-5,Qionglai 1 and so on,more than 20 Wells,identify the area of reservoir development characteristics and control factors,which has the vital significance to guide the next exploration direction.The analysis of wells?field sections?rock debris?core sample?formation testing,We hold the opinion that Strata in the researched area mainly distribute in daxing field-chengdu area as the depocenter and denudate inconformity,formation intact Relatively in Longmen Shan anterior margin on the whole as a whole,the sedimentary facies is given priority to with development restricted-evaporate platform and more or less Platform inner shoals development but which is not large,salt depocenter is Daxing area,reservoir lithology is mainly granular and gain dolostones,reservoir property Performance as low porosity and low permeability,local area developed high permeability zone,fracture is varying degrees growing in the study area,but many were filled of calcite?anhydrite,Limited the constructive reconstruction of the reservoir,reservoir development is layered,the main development in the three-five sections of Leik-oupo formation,Give priority to with beach facies reservoir,meanwhile,more development of intergranular dissolved pore,intergranular dissolved pore,grain-superposition of karst reservoir is the best types of reservoirs,Leik-oupo formation's reservoir distribution is mainly affected by beach facies control,in the late diagenesis modification is an important factor of reservoir formation,Supergene karst role to the region of reservoir development has a certain effect.