适用于水平井轨迹设计的深度域随机模拟反演技术

大牛地气田储层横向岩性变化剧烈、纵向砂泥叠置，具有非常强烈的非均质性，为典型低渗特低渗油气田。为进一步提高储量动用率，2012年针对大牛地气田实施水平井规模化整体部署。水平井整体部署成功率的提高所面临的难题是在单砂体精细刻画的基础上进行水平井轨迹设计。通过攻关研究，形成了适用于水平井轨迹设计的深度域随机模拟反演技术，通过利用测井资料的准确深度信息，有效解决了A靶点及导眼井测井数据测深不够，无法准确标定的难题。经数百口水平井部署及跟踪证实，该技术不仅极大提高了目标砂体埋深预测精度，同时有效降低了井间合成记录标定的误差，地层对比关系正确可靠，反演外推能力明显提高，有力地支撑了大牛地气田2012年10×10⁸ m³及2013年9×10⁸ m³天然气产能建设任务的圆满完成。

As a typical low permeability gasfield,the Daniudi Gasfield is characterized by strong heterogeneity,dramatically variable lateral lithology with vertically overlaying sand and mud.In 2012,in order to produce nature gas effectively,the overall deployment of horizontal wells has been carried out in Daniudi Gasfield.Since that,the stochastic stimulation inversion in depth domain for horizontal well is developed,which can be used for the design of well trajectory based on fine characterization of single sandstone.By technical research,we proposed stochastic stimulation inversion in depth domain for horizontal well trajectory design.With our method,the accurate depth information of logging data can be applied to compensate the deletions measured depth of the logging data for A point-target and pilot hole,and eventually to obtain precise calibration results.With the verification of hundreds of horizontal wells in the area,the technology can improve the accuracy of depth prediction and reduce the crosswell synthetic seismogram calibration error.Meanwhile,the extrapolation ability of inversion resultsis enhanced obviously.Based on the technology,1 billion and 900 million cubic meter nature gas production capacity have been established in 2012 and 2013.