基准面旋回原理在储层研究中的应用——以川中公山庙构造沙一油藏为例

Application of the base-level cycle principle in reservoir characterization:A case study of Sha1 Reservoir in Gongshanmiao structure in middle Sichuan

以川中公山庙构造沙一油藏为例,以高分辨率层序地层学的基准面旋回原理为指导思想,在储层沉积学特征研究的基础上,从“沉积作用—基准面旋回—非均质性研究”的思路出发,较详细地分析了沙一油藏不同级次的基准面旋回的特点及其对储层宏观非均质性的控制。在沙一油藏滨浅湖—三角洲相沉积体系中共划出1个长期、6个中期和29个短期旋回层序。在此基础上指出沙一油藏储层宏观非均质性受控于基准面的旋回变化,一般在中期基准面旋回上升半旋回的下部砂体比较发育,非均质性弱;各中期基准面旋回上升半旋回末期和下降半旋回期泥质沉积较发育,非均质性强;同时探讨了基准面旋回原理在储层表征和油气田开发中的应用前景。

Taking Sha1 member of Gongshanmiao formation in the middle of Sichuan as an example,this paper analyzes the characteristics of different base-level cycles and its control on macro heterogeneity under the guidance of high-resolution sequence stratigraphy,on the basis of reservoir sedimentology study,and starting with the research thinking'from sedimentation to base-level cycle to heterogeneity '.Sha1 shallow shore lake-delta sedimentation system are divided into one long term,six medium terms and twenty-nine short terms of cyclic sequences.It is pointed out that reservoir heterogeneity was subjected to the change of base-level cycle.The lower section of the rising cycle of the medium cycles has developed sandstones and weak heterogeneity;the end of the rising cycle and the falling cycle have well-developed argillaceous sedimentation and strong heterogeneity.The application of base-level cycle principle in reservoir characterization and oilfield development is also discussed.