【摘要】 四川盆地川东北高陡复杂构造区地表多深沟、陡崖,地下断裂系统异常复杂,基于多轮二维地震解释成果始终不能很好地查清工区构造之间的接触关系及断层的组合规律,导致多口钻井不能顺利钻遇地质目标。为此,开展了三维地震精细构造解释研究:1通过单井和连井精细标定地质层位,充分利用大斜度井的井斜数据,严格按照实钻井轨迹准确标定层位;2在结合地面地质露头剖面进行地震剖面"地质戴帽"的基础上,对钻遇复杂断块的实钻井进行地质剖面恢复,确定其合理构造解释模式,从而对数据体进行三维立体可视化多方位综合解释;3针对不同断块,采用合理的速度场,利用同层或串层层速度模型进行变速成图。基于三维地震解释构造成果部署并钻探了10余口井(大部分为水平井),目前已完钻的8口井均获得高产工业气流,钻探成功率达到100%。更多还原

【Abstract】 The northeast of Sichuan Basin is complex high-steep structure zone,where underground fault systems are very complicated and deep valleys and steep cliffs are throughout the surface.When drilling geological target,more than one well drilling didn’t get along smoothly,because the multiple 2Dseismic interpretation results can not clearly reveal the structural relationship and the combination rule of faults.Therefore,3Dseismic fine structural interpretation was carried out.Geologic horizons were fine calibrated through single well and well tie,well deviation data of a highly-deviated well is sufficiently utilized,and the horizon is accurately calibrated in strict accordance with the practical wellbore trajectory.Based on "geologic capping"of seismic sections in combination with outcrop sections,actual trajectory of drilling wells met with complicated fault blocks were geologically restored,and its reasonable structure interpretation patterns was determined,so that the data volume was subjected to 3Dvisual comprehensive interpretation.Reasonable velocity fields were adopted for different fault blocks,and variable velocity mapping was implemented by using a same-stratum or serial-stratum interval velocity model.Based on the 3Dseismic fine structural interpretation,more than 10wells(the majority are horizontal wells)were deployed.Currently,8completed wells obtain natural gas with high yields with success rate of 100%.更多还原