测井约束反演技术在不同类型沉积体系中的应用

The application of log-constrained inversion in different kinds of sedimentary system.

为了把测井约束反演技术真正有效地应用到储层预测中,针对不同类型沉积体系,提出了应注意的问题:①针对浅层河流相砂泥岩互层,必须做好测井资料的环境校正,以避免因泥浆浸泡而引起的速度差异;②对于含有碳酸盐岩的冲积扇相砂砾岩体,在建立地质模型的基础上,利用多井多参数约束反演,建立相应的解释模型,以克服反演结果的多解性;③在储层与围岩速度难以区分的湖相沉积体系中,应在波阻抗反演的基础上,找出能区分储层和围岩的其它测井曲线(如自然伽马、视电阻率等)进行反演,以提高分辨率;④在复杂的海相碳酸盐岩裂缝储层中,要以钻井资料为依据,选择以钻井为约束主体的反演方法,以达到反演结果与地质条件吻合的目的。

Applying the well-log-constraint inversion technology to the reservoir prediction effectively, the problems were pointed out in different sedimentary systems: (1)In the sandstone-mudstone interbed of fluvial facies in shallow layer, the environment corrections of acoustic log should be done to avoid the speed error leading by the soak of slurry. (2)In granule gravel reservoir of the alluvial facies,which contains carbonate,based on the geological model, the multi-wells and multi-parameters constraint inversion are applied, and build the corresponding interpretation model to gained the exactitude data of the inversion (3)In the lacustrine system which the speed of reservoir is close to the wall rock, based on the acoustic impedance inversion,finding out the other well log (e. g. Natural gamma, apparent resistivity) to inverse, the resolving rate can be improved. (4)In the complicated carbonate rock reservoir of marine facies, being applied to the drill data, and selected the inversion means in which the well is the constraint main body, the result of inversion accord with geological condition can be achieved.