4. The data summarized in Table Q4 (a) are from a build up test of oil well Y. Estimate the effective permeability to oil, skin factor and wellbore storage coefficient with the Bourdet et al type curve. Additional reservoir and fluid properties are given in Table Q4 (b). Table 4 (a) Oil Well Y nrescure build un survev Table Q3(b): Reservoir and fluid properties [30 marks]