Heterogeneity characteristics of Chang 2 reservoir in Liangmatai unit of Zhangyaoxian block,Dingbian Oilfield
In order to study the heterogeneity characteristics of Chang 2 reservoir in Liangmatai development unit of Dingbian Oilfield,the macroscopic and microscopic heterogeneity characteristics of the study area were studied through methods such as logging data,core analysis,and mercury intrusion experiments.Fur-thermore,the heterogeneity characteristics of the Chang 2 reservoir were analyzed.The results show that the Chang 2 reservoir is mainly composed of gray green fine-grained feldspar sandstone and feldspar lithic sandstone,with good particle sorting and roundness,fine particle size,developed inter-granular pores and residual dissolution pores,and small pore throats.By calculating heterogeneity parameters such as sand to ground ratio,interlayer development status,and coefficient of variation,the widely developed interlayer in-tensifies interlayer heterogeneity and has an important influence on oil and gas migration and accumulation.The shale interlayer of Chang 2 reservoir increases the reservoir heterogeneity,and the permeability is domi-nated by positive rhythm and compound rhythm.The channel sand body affects the horizontal distribution of the reservoir,and the porosity and permeability distribution of Chang 2 reservoir are closely related to the distribution and development of the sand body.
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