Control effect of reservoirs on tight oil distribution-a case study of Chang 6 oil layer group in Zhangjiatan area of Ordos Basin
Based on lithology,physical properties,high pressure mercury injection data,casting sheet,scanning electron microscopy data,combined with well logging,oil test and production test data,the control effect of reservoir on Chang 6 tight oil distribution was analyzed.The results show that the oil-bearing li-thology of Chang 6 reservoir in Zhangjiatan is fine sandstone,while the siltstone does not contain oil.There is a positive correlation between the thickness of oil layers and the thickness of sand bodies,which is con-centrated in the central,western,and southern regions on a plane.The pore structure is mainly divided into two categories,with Class Ⅰ being fine pore and micro throat,dominated by oil leaching and oil spot levels,Class Ⅱ being fine-microporous and microfine throat-microthroat,dominated by oil traces and fluores-cent.Various diagenetic processes and sedimentary environments result in strong reservoir heterogeneity,controlling the differential enrichment of oil.Heterogeneity within the layer forms relatively high porosity and high permeability sand bodies and controls the accumulation of tight oil.While planar heterogeneity results in areas with large oil layer thickness mainly distributed in areas with large and stable sand body thickness.
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