井震结合反演技术识别河道砂体在朝阳沟油田的应用

Application of identification of channel sand body by logging-seismic combination inversion technology in Chaoyanggou oilfield

针对朝阳沟油田基于井进行储层刻画存在多解性、无法准确地描述井间砂体变化的难题,提出了在平面上采用井震结合反演技术来预测河道砂体的分布。在精细井震标定、高精度三维构造模型及准确变差函数模型的基础上,进行反演运算,输出岩性体、波阻抗体及岩性概率体。并利用反演平面属性图,刻画了PI1层井间的砂体分布变化,弥补了基于井进行储层刻画的不足,提高了储层砂体的认识程度,显示了井震结合方法的适用性。

Aiming at the problems that reservoir depiction has ambiguity and can not describe interwell sand body variation accu- rately, prediction of channel sand body distribution by logging-seismic combination inversion technology on plane was proposed. On the basis of meticulous logging-seismic calibration, high-precision 3D structural models and accurate variation models, inver- sion operation was carried on to output lithosome, wave impedance cube and lithologic probability cube. Meanwhile, inversion plane attribute graph was used to depict the interwell sand body distribution variation of layer PI 1, make up the disadvantage of res- ervoir depiction, improve the knowledge of reservoir sand body and improve the applicability of logging-seismic combination meth- od.