The Study On Reservoir Characteristic Of Chang 4+5 In The West Area Of BaiyuMountain Of Jing'an Oilfield

Logging datas,the core sample and analysis test data of target area have been fully used in the paper,small layer division and contrast of 206 wells were done also,sedimentary microfacies was identified and sedimentary microfacies and sandbody distribution patterns were analyzed.Through thin section identification,property of core analysis,high-pressure mercury injection and scanning electron microscope analysis data,it will focus on the development of reservoir macroscopic and microscopic characteristics,establish a reservoir classification evaluation standard,and divide Chang 4+5 into small layers of reservoir evaluation.Based on the above research,reservoir evaluation of Chang 4+5 in Baiyu Mountain is displayed.According to the reservoir characteristics and the main controlling factors of the reservoir formation,the paper will summarize regularity of oil distribution of Baiyu Mountain.The Chang4+5 reservoir formation thickness changed little overall,subdivision for Chang 4+51,Chang 4+521-1,Chang 4+521-2,Chang 4+522-1 and Chang 4+52-2,developing a nearly NE-SW trending nose shaped uplift structure.The Chang 4+5 reservoir with delta front depositional system developed can be further divided into the underwater distributary channel,the interdistributary bay,the channel side edge and the estuary dam.The reservoir rock is mainly lithic arkose which is grey or light grey,The pore type is mainly primary intergranular pore and feldspar dissolved pores,pore combination to intergranular pass,solution pores,intergranular pass and intergranular pore and dissolved pore mainly,The reservoir type is low porosity and extra low permeability,the heterogencity of reservoir is strong,and the heterogeneity of Chang 4+52-1 reservoir is weaker.And then select the permeability,porosity,oil saturation,shale content and FZI which are the most of representative parameters divide flow units in the study area.The results show that the class ? flow unit is the most.Finally through the source condition,reservoir and set conditions,cap rock and occlusion conditions analyzed,determine the distribution of oil and gas controlling factors and distribution characteristics of reservoirs,conducts the research to the enrichment laws of oil reservoirs.