基于多元线性回归的地层平均速度分析及应用——以渤海A油田为例  

Analysis and application of formation average velocity based on multiple linear regression:A case study from A oilfield in Bohai Sea

作　　者：谷志猛 明君 刘传奇 王腾 GU Zhimeng;MING Jun;LIU Chuanqi;WANG Teng(Bohai Oilfield Research Institute,Tianjin Branch,CNOOC,Tianjin 300452,China)

机构地区：[1]中海石油(中国)有限公司天津分公司渤海石油研究院,天津300452

出　　处：《岩性油气藏》2021年第4期121-127,共7页Lithologic Reservoirs

基　　金：国家科技重大专项“近海隐蔽油气藏勘探技术”(编号:2011ZX05023)资助。

摘　　要：为了反映地下构造特征,通常采用地层平均速度进行时深转换,而影响地层平均速度的因素很多,要得到准确的速度值并不容易。在稳定的沉积条件下进行地层平均速度公式推导,通过分析影响地层平均速度的敏感因素,将其转化为包含流体信息的含气比、含油比和砂地比的多元线性拟合公式,利用已知钻井信息通过最小二乘法求解未知项,得到最终的地层平均速度表达式。数值模拟结果和在渤海A油田的应用实例表明,多元线性回归的平均速度公式的计算结果与真实值的相对误差低于0.5%,具有较高的预测精度。该方法对类似地质条件地区具有一定的借鉴意义。Formation average velocity is often used for time depth conversion to reflect the real characteristics of underground structures,however,there are many factors that affect formation average velocity and it is not easy to get the accurate velocity value.The formation average velocity formula was derived under stable deposition conditions,and it was transformed into a multiple linear fitting formula of gas-sand ratio,oil-sand ratio and sandstrata ratio by analyzing the sensitive factors affecting the formation average velocity of the study layer.The known drilling information was brought into the formula and the unknown term was solved by the least square method,then the final average velocity expression was obtained.The results of numerical simulation and application in A oilfield in Bohai Sea show that the calculated value of average velocity formula based on multiple linear regression has high prediction accuracy,the relative error between the calculated value and the real value is less than 0.5%.This method can be used for reference in areas with similar geological conditions.

关 键 词：平均速度 多元线性回归 砂地比 最小二乘法 低幅度构造 

分 类 号：P631.8[天文地球—地质矿产勘探]