一种提高波阻抗反演建模精度的方法

A Method of Improving Modeling Precision of Wave Impedance Inversion

波阻抗反演是储层预测的重要手段之一。反演按计算方法可分为递推法和模型法两大类。其中模型法反演具有分辨率高、抗干扰能力强等优点,但具有多解性却是其致命点,反演结果依赖于初始模型。为了解决多解性问题,提高了一种新的建模方法,在常规建模的基础上,利用波形对比方法对模型进行修正,克服了由于地震层位解释不准以及地层与解释层位关系复杂造成的模型出现的偏差现象。此外,在模型上加上地震道积分信息,使模型融入了更加丰富的地震信息,从而提高建模精度和反演质量。

Wave impedance inversion is one of the most important measures of reservoir prediction. According to calculating methods it can be divided into two types： recursion method and model method. Model method has the advantage of high resolution and anti--jamming ability. But multi--solution is its fatal problem. And the inversion result depends on the initial models. To solve the multi--solution problem, this article presents a new modeling method that waveform comparison method is used to modify the model on the base of conventional modeling, which corrects the moder deviation caused by incorrect seismic layer interpretation and the complicated relations between strata and interpretation layers. Furthermore, seismic channel integral information added into the model makes our model contain richer seismic information,thus improving modeling precision and inversion quality.