微幅度构造解释及变速成图方法——以泌阳凹陷梨树凹地区为例

Micro-relief structures interpretation and variablevelocity mapping method:case study on Lishuao area of Biyang Depression

(1.中国石油化工股份有限公司河南油田分公司石油勘探开发研究院,河南南阳473132；2.长江大学地球物理与石油资源学院,湖北荆州434023)

Exploration and Development Institute,Henan Oilfield Company,Nanyang 473132,China

泌阳凹陷梨树凹地区成藏条件复杂,主要的油藏类型为岩性油气藏和构造—岩性油气藏。岩性油气藏与微幅度构造油气藏规模小,识别和预测难度大。针对隐蔽小断层和微幅度构造，利用高精度三维地震资料,并结合测井资料,通过精细层位标定,采用综合解释技术,对古近系核桃园组目的层进行了精细解释；在此基础上,通过建立精细速度场,采用变速成图方法落实了微幅度构造。对比分析了由变速成图方法得到的结果和钻井结果,表明变速成图方法的绝对误差小,精度高。根据预测结果部署钻探的井在目的层段获得了一定的石油产量。

The pooling conditions are complex in Lishuao area of Biyang Depression. There are lithologic reservoir and structural-lithologic reservoir at the area. Lithologic reservoir and micro-relief structural reservoir are small scale,which are difficult for identification. By using high-precision 3-D seismic data,combined with log data,aiming at subtle small faults and micro-relief structures,the target intervals of Paleogene Hetaoyuan formation were fine interpreted. On this basis,by building detailed velocity field,variable-velocity mapping method was applied to ascertain micro-relief structures. Compared with drilling results,the result shows that the absolute error of variable-velocity mapping method is small,while its accuracy is high. The well deployed by prediction results has obtained some production.