石油物探2018，Vol.57Issue(1)：122-128,139,8.DOI:10.3969/j.issn.1000-1441.2018.01.016
基于综合信息的三维层速度场建立及其在涪陵页岩气田应用研究
Three-dimensional interval velocity building based on comprehensive data analysis and its application in Fuling shale gas field exploration
摘要
Abstract
The velocity field produced by conventional methods does not meet the accuracy requirement for the detection of struc-ture and formations in horizontal well drilling in shale gas exploration.In this paper,we present a 3D interval velocity field building method based on comprehensive analysis of the following data:stacking velocity,logging data,structural interpretation results and seismic data.We adopted several techniques for estimating the interval velocity for the proposed method,namely,the Dix formula, the constrained Dix formula,model tomography,and wave impedance inversion.First,we divided the formation into upper and low-er strata according to the initial depth of logging data.Then,for the upper strata,we use the first three conventional techniques mentioned above to estimate its interval velocity based on stacking velocity and structural interpretation results.We use the wave impedance inversion for the lower strata to obtain its interval velocity based on 3D post-stack seismic data,logging data,and struc-tural interpretation results.Finally,we combine the upper velocities estimated via the three techniques and the inverted lower veloc-ity.We then select the best combined interval velocity in the study area.This method takes advantage of the high-resolution wave impedance inversion.The test results of seismic data in the Fuling shale gas field showed the decrease in depth error between the depth structure map from the velocity field obtained using the proposed method and the shale formation depth measured by drill-ing,which indicates that this method is practical for the exploration and development in the Fuling shale gas field.关键词
层速度/页岩气/变速成图/反演/涪陵页岩气田/深度误差Key words
interval velocity/shale gas/variable velocity mapping/inversion/Fuling shale gas field/depth error分类
天文与地球科学引用本文复制引用
张水山,熊晓军,刘阳,李翔..基于综合信息的三维层速度场建立及其在涪陵页岩气田应用研究[J].石油物探,2018,57(1):122-128,139,8.基金项目
国家科技重大专项"高精度页岩气地层压力预测方法研究"(2016ZX05060-006)资助. This research is financially supported by the National Science and Technology Major Project of China (Grant No.2016ZX05060-006). （2016ZX05060-006）
