基于正演模拟分析叠后反演预测薄储层的能力

ABILITY TO PREDICT THIN RESERVOIRS BY ANALYZING POST- STACK INVERSION ON THE BASIS OF FORWARD MODELING

依据勘探地质目标以及大庆长垣油田北部薄互储层的地质、测井信息建立正演模型。首先采用波动方程正演模拟得到地震合成记录，然后分别进行确定性反演和随机反演，进而分析利用叠后地震信息进行储层预测的潜力。结果表明，常规叠后确定性反演对薄层的刻画能力有限，而充分利用开发阶段井网密度大的优势并采用随机反演能够提高地震资料对井间薄储层的预测能力。

According to the geological targets and the informations of both geology ＆ well logging, the forward models are established for the thin interbeds in the northern part of Daqing Placanticline. First of all, adopting the forward modeling of wave equation, the seismic synthetic traces are obtained, and then the determined and random inversions are respectively conducted. And furthermore with the help of the post-stack seismic information, the potentials of the reservoir prediction are analyzed. The results show that the describing capacity for the thin reservoirs by conventional post-stack inversion is limited, on the contrary, through making full use of the superiority of big well spacing density at development stage and random inversion, the prediction ability to the thin reservoirs among the wells can be enhanced a great deal.