Analysis of reservoir characteristics and main controlling factors of Chang 6 member in Yuele area,Ordos Basin
This study seeks to clarify the characteristics and factors controlling the reservoirs of the Chang 6 member of the Triassic Yanchang Formation in the Yuele area of the Ordos Basin.We combined data on the core,thin-slice identification,scanning electron microscopy,high-pressure mercury injection,and geophysical logging-based explanations to examine the importance of sedimentation and diagenesis for the storage of the reservoir of the Chang 6 member in terms of its petrological and physical characteristics as well as its pore structure.The results showed that the lithology of the Chang 6 member in the Yuele area was dominated by lithic feldspar sandstone,and mainly contained intergranular and feldspathic pores.The average porosity of the Chang 6 member in the Yuele area was 9.27％and its average permeability was 0.142 × 10-3 pm2.It thus had ultra-low-porosity and permeability.We used standards of categorization of reservoirs to divide reservoirs of the Chang 6 member into categories Ⅰ,Ⅱ and Ⅲ in order from best to worst.The depositional environment provided the material basis for the Chang 6 member.Diagenesis was a vital process in the formation of the dense reservoir in the study area.Cementation can be used to fill the pore space and block the throat of the pores to alter the physical properties of the reservoir,while dissolution can enhance its properties.The research here provides guidance for further exploration and development in the area.
Or dos BasinYuele areaChang 6 memberreservoir characteristicssedimentationdiagenesis
万方数据
维普
