涠洲W油田复杂流体性质测井定量识别技术

Logging quantitative identification method for complex fluid property in Weizhou W Oilfield

南海西部海域北部湾盆地涠洲W油田四井区的油层中常有"气层"出现,给该油田的开发调整规划造成一定困难。通过地层组分分析模型和最优化理论计算储层条件下天然气和可动油的含量,由此计算产层的气油比,根据计算得到的气油比识别储层流体性质。实际应用表明,该研究方法对区分油气同层和油层有较明显的地质效果,并且与地层测试的结果较吻合,对其他盆地复杂流体性质的测井评价具有一定的指导意义。

Gas-bearing layer is frequently appeared in oil reservoir of Weizhou W Oilfield in Beibu Gulf Basin of the western South China Sea,and leads some difficulties in the development adjustment of the Oilfield. According to the analysis model of formation components and the optimization theory,it was calculated the contents of solution gas and movable oil under the reservoir condition,and then the gas-oil ratio of producing pay. Based on the calculated gas-oil ratio,the reservoir fluid property was identified. The field application showed that the method has significant geological effect on distinguishing gas-bearing oil pay zone from oil pay zone,and the calculation results have good agreement with formation testing. It can provide a successful experience for the logging evaluation of the complicated fluid property in other oilfield.