基于地下单位体积岩石含气率的录井解释方法研究

Mud logging interpretation method based on subsurface per unit volume of rock gas-bearing rate

在油田勘探开发系统工程中油气水层解释评价是重中之重,录井解释常用的手段是利用气测录井对储集层进行含油气性评价。基于地下单位体积岩石含气率的解释方法研究以常规录井数据、气测数据为基础,用地层取样、地层测试等结论来验证,通过整合不同区块、层组已钻探井的储集层流体结论信息,对不同流体类型的常规录井气测数据进行计算及特征统计,消除井筒环境参数、钻井工程参数的影响,建立地下单位体积岩石含气率的储集层评价方法及标准。经录井现场实例验证,地下单位体积岩石含气率解释评价方法适用于南海西部各盆地中不同地层的各种流体类型,取得了较好的应用效果。该方法将理论与实际相结合,从地下单位体积岩石含气率计算入手,从还原地层真实含油气信息的角度进行储集层解释评价,逐步提高了录井资料解释应用的精准度和可信度,具有一定的创新性。

In oilfield exploration and development system engineering,the evaluation and interpretation for oil,gas and water layers is the top priority,and common method used in mud logging interpretation is to use gas logging to evaluate the oilbearing property of the reservoirs.The study of interpretation method based on subsurface per unit volume of rock gasbearing rate takes conventional mud logging data and gas logging data as bases,uses the formation sampling and formation testing results to verify,through the integration of reservoir fluid conclusion information from drilled wells in different blocks and bed set,the authors made calculation and characteristic statistics for different fluid types of gas logging data of conventional mud logging,established the reservoir evaluation method and standards for subsurface per unit volume of rock gas-bearing rate by eliminating the influence of wellbore environment parameters and drilling engineering parameters.Tested by mud logging practice,the evaluation and interpretation method for subsurface per unit volume of rock gas-bearing rate is applicable to all kinds of fluid types of different formations of basins in the west of South China Sea,and has achieved good application effects.The method combines the theory with practice,starting from the calculation of subsurface per unit volume of rock gas-bearing rate,the authors carried out the reservoir evaluation and interpretation from restoring the true formation oil and gas information,which has gradually increased the precision and credibility of mud logging data interpretation and application and has a certain innovation.