Characteristics and sensitivity of Chang 2 reservoir in Block Z of Q Oilfield
In order to improve the development effect of Block Z of Q oilfield,make clear the basic reservoir characteristics,filling the gap in reservoir sensitivity analysis,and strengthen reservoir protection,the pe-trology,pore structure,physical properties,and reservoir sensitivity analysis were carried out for Chang 2 low-permeability reservoir.The results show that the main rock type in the study area is arkose sandstone,the porosity is 5.8～19.8%,with average of 15.9%.The main distribution range is 15～19%,accounting for 66.8%of the total samples.The permeability is 0.038～319.56×10-3μm2,with average of 24.63×10-3 μm2,the main distribution range is 1～100×10-3 μm2,accounting for 86.6%.The reservoir belongs to medium porosity and low permeability reservoir.The reservoir sensitivity analysis shows that there are weak velocity sensitivity,medium-strong～strong water sensitivity,strong salt sensitivity,medium-weak～no acid sensitivity,medium-weak～weak alkali sensitivity.The above results provide an important basis for reservoir protection and reasonable reservoir development policies in Block Z.
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