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大庆油田曲流河沉积厚油层聚合物驱油后进一步提高采收率面临着含水高、剩余油高度分散等难点。为了准确描述剩余油分布特征,需要精细刻画曲流河沉积厚油层非均质性。本文以北一区断东“二三结合”试验区葡Ⅰ2沉积单元为例,按照平面非均质性、层内非均质性两个方面对葡Ⅰ2单元非均质性进行了精细刻画。提出聚驱后厚油层非均质性的主要研究内容,即:平面上开展单砂体分布特征研究;层内开展对曲流河侧积夹层的定量描述。该研究成果不仅增加了储层非均质性研究的深度和精度,而且为精细刻画聚驱后剩余油分布特征奠定了地质基础。
In Daqing Oilfield, meandering river sedimentary thick oil layer polymer flooding further enhanced oil recovery is facing high water content, residual oil highly dispersed and other difficulties. In order to accurately describe the distribution of remaining oil, it is necessary to finely characterize the thick reservoir anisotropy of meandering rivers. In this paper, taking the Ⅰ 2 sedimentary unit in the east Ⅱ “combined experiment” area of Bei 1 area as an example, the inhomogeneity of PI 2 was refined according to the plane heterogeneity and in-layer heterogeneity Portrayed The main research contents of thick oil layer heterogeneity after the polymer flooding are proposed, that is: the study on the distribution characteristics of single sand body in the plane; and the quantitative description of the meandering interlayer in the meandering river. The research results not only increase the depth and accuracy of reservoir heterogeneity research, but also lay a geological foundation for the fine characterization of remaining oil distribution characteristics after polymer flooding.