鄂尔多斯盆地任山井区延10~1储层地质建模研究

Research on geological modeling of Yan10~1 reservoir in Renshan well area of Ordos Basin

鄂尔多斯盆地志丹油田任山井区延安组成藏条件及油气分布特征较复杂,为了掌握优势储层空间的发育规律及寻找有利的储层聚集区,利用变差函数结合储层的微相模型,构建并优化了延101储层的构造模型、沉积相模型和属性模型。通过概率分布一致性检验及储量核算验证,发现属性模型误差较小,可较准确地模拟储层参数的三维空间分布规律。同时采用三维网格法,计算出随机性模型下研究区原油地质储量为58.17×10~4 t,计算结果可信。通过地质建模预测出研究区延101的2个Ⅰ类储层,该研究为油田中后期剩余油开采提供了地质依据,同时为同类油田开发提供参考。

The Yan'an formation conditions and oil and gas distribution characteristics in the Renshan well area of the Zhidan Oilfield in the Ordos Basin are relatively complex.In order to explore the development laws of advantageous reservoir spaces and find favorable reservoir accumulation areas,the structural model,sedimentary facies model,and attribute model of the Yan101 reservoir were constructed and optimized using a variation function combined with the microfacies model of the reservoir.Through probability distribution consistency testing and reserve accounting verification,it was found that the error of the attribute model is relatively small,which can accurately simulate the three-dimensional spatial distribution of reservoir parameters.At the same time,using the three-dimensional grid method,the geological reserves of crude oil in the study area under the randomness model were calculated as 58.17×10~4 t,which was a reliable result.Two class I reservoirs in Yan10~1 of the study area were predicted through geological modeling.This study provides reliable geological basis for residual oil extraction in the middle and later stages of the oilfield,and also provides reference for the development of similar oilfields.