三维地震速度建模技术在川南页岩气随钻地质导向中的应用  

Application of 3D seismic velocity modeling technology to geosteering of shale gas while drilling in southern Sichuan

作　　者：张明 李润川[2] 余兆才 于学勇 王熊飞[4] 陈怡仁 ZHANG Ming;LI Runchuan;YU Zhaocai;YU Xueyong;WANG Xiongfei;CHEN Yiren(Tarim Institute of Geophysical Exploration,Research Institute of BGP INC.,CNPC,Korla,Xinjiang 841000,China;Development Enterprise of PetroChina Southwest Oil&Gas Field Company,Chengdu,Sichuan 610066,China;EISC Southwest Branch,Materials and Equipment Company,China National Logging Corporation,Guanghan,Sich-uan 618300,China;Southwest Institute of Geophysical Exploration,Research Institute of BGP INC.,CNPC,Chengdu,Sichuan 610000,China)

机构地区：[1]中国石油集团东方地球物理勘探有限责任公司研究院塔里木物探研究院 [2]中国石油西南油气田分公司开发事业部 [3]中国石油集团测井有限公司物资装备公司EISC西南分中心 [4]中国石油集团东方地球物理勘探有限责任公司研究院西南物探研究院

出　　处：《录井工程》2024年第2期80-90,共11页Mud Logging Engineering

基　　金：中国石油集团油田技术服务有限公司科学研究与技术开发项目“EISC平台完善与数据治理技术研究与应用”(编号:2023T003001)。

摘　　要：四川盆地川南地区地质构造复杂,地层变形强度不一,精细三维地震速度建模难度较大。以往地震速度建模更多侧重于深层目的层水平段的迭代校正,但丛式平台井在浅层非目的层段复杂工况(气侵、溢流、漏失、掉块等)频频发生,严重影响了钻井时效和施工安全,亟需建立深、浅层兼顾的精细地震速度模型进行时深转换。基于三维时间域地震数据,通过精细人工合成地震记录标定,结合层位数据和井数据,建立初始地震速度模型,并参考实钻邻井数据设置虚拟控制井,采用最小曲率插值和反距离加权插值相结合的方法,对初始地震速度模型进行优化,可快速实现深、浅层同时迭代校正,最终得到符合构造沉积特征的精细三维地震速度模型。在川南地区现场随钻地质导向过程中应用校正后的三维地震速度模型可以及时、准确地为钻井工程提供全层系风险预警和地质导向建议,效果显著,可推广应用。In southern Sichuan region of the Sichuan Basin,the geologic structure is complex and the formation deformation strength is different,so it is difficult to model the fine 3D seismic velocity.In the past,seismic velocity modeling focused more on the iterative correction of the horizontal section of the deep target bed,but the complex working conditions(gas invasion,overflow,leakage,casting,etc.)frequently occurred in the shallow non⁃target bed of the cluster platform well,which seriously affected the drilling time and construction safety,it is urgent to establish a fine seismic velocity model that takes into account both deep and shallow layers for time⁃depth conversion.Based on 3D time domain seismic data,the initial seismic velocity model is established by precise artificial synthetic seismogram calibration,combining horizon data and well data,and then the virtual control well is set up by referring to the actual drilling data of adjacent wells.The initial seismic velocity model is optimized by combining the minimum curvature interpolation with inverse distance weighted interpolation,which can quickly realize the simultaneous iterative correction in deep and shallow layers.Finally,a fine 3D seismic velocity model conforming to the tectonic sedimentary characteristics is obtained.Using the corrected 3D seismic velocity model,the time⁃depth conversion data can provide timely and accurate risk warning and geosteering suggestions for the whole strata in drilling engineering.This technology has remarkable effect in on⁃site geosteering while drilling in the southern Sichuan region and can be widely applied.

关 键 词：页岩气 三维建模 地震速度 随钻地质导向 四川盆地 川南地区 

分 类 号：TE132.1[石油与天然气工程—油气勘探]