农安扶余地区油页岩测井识别与总含油率计算

Log Identification and Total Oil-cut Calculation of Oil Shale in Nongan and Fuyu Area

针对吉林省农安扶余地区油页岩的测井响应特征,提出利用曲线幅差法识别油页岩的岩性,对于扶余伊家店A井,幅差法的油页岩识别率高于交会图法,扶余伊家店A井和农安哈拉海B井的油页岩识别率分别为90.59%和87.61%。针对较为成熟的油页岩,提出将油页岩的含油率分为2个部分,即有机质在低温干馏后可以产生的含油率Ta1和孔隙中游离态的含油率Ta2。Ta1的求取通过建立岩心与测井数据之间的拟合关系式获得;Ta2的求取需要在确定出相关组分的体积分数之后借助油页岩导电方程。根据油页岩组分特征,建立起简化的油页岩四组分体积模型,在现有数据基础之上提出间接求取的方法。对该地区2口油页岩井的总含油率进行计算的含油率与岩心含油率之间的平均相对误差分别为0.245和0.279。

Based on the logging response characteristic analysis of the oil shale in Nongan and Fuyu area in Jilin Province, curve difference method is proposed to identify oil shale＇s lithology and compare its result with the double parameters crossplot method. For the well A in Fuyu, the oil shale identification precision of curve difference method is higher than that of crossplot method, the identification rate of well A and B is 90. 59% and 87.61% respectively. Aimming at relatively mature oil shale, we divide the oil content into two parts.the potential oil content Tal after organic matter retorting under low temperature and the dissociative oil content Ta2 in pore. The Tal is calculated based on the fitting relation between the core and log data, and the Ta2 is calculated by oil shale conductive equation after determining the volume fraction of related components. According to the characteristics of the oil shale components, a simplified four component volume model is built for oil shale, and a indirectly calculated method is proposed based on the limited datum. The total oil cut of the two oil shale wells in the area are calculated respectively, the average relative errors are 0. 245 and 0. 279 respectively between the calculated results and core datum.