12 / 2021-05-30 22:23:08

砂质滨岸相储层构型建模方法

滨岸相 储层构型 三维地质建模 定量刻画 水平井

储层构型研究以及构型的三维地质建模，对于油藏精细描述、剩余油挖潜等研究都具有重要意义。本文以哈得逊油田东河砂岩砂质滨岸相储层为例，建立砂质滨岸相储层构型建模方法。国内外对于滨岸相储层构型的研究较少，对其构型建模缺乏成熟的研究方法，同时该区东河砂岩油藏具有埋深大，储层薄等特点，增加了地质建模的难度。针对以上问题，首先利用取心井资料，筛选出GR、DEN曲线对滨岸相储层构型界面进行分类识别。以沉积成因模式为约束条件，确定其构型模式。采用直井与水平井相结合的方法对滨岸相储层构型界面分级次进行定量刻画，得出平行和垂直古岸线方向上其厚度与延伸长度的定量关系。在构型模式与定量公式的约束下，采用多级次耦合的方法建立三维地质模型。研究结果表明，该区三级、四级构型界面对油水起主要控制作用。四级构型界面在平行于古岸线方向上的延伸长度为516~4560m，垂直方向上延伸长度为439~2549m，长宽比为1.8:1；三级构型界面在平行于古岸线方向的延伸长度为344~1509m，垂直方向上延伸长度为265~974m，长宽比为1.7:1。利用生产动态资料对构型模型进行检验，证明该方法建立的构型模型具有合理性强、可靠性高等优势。



Reservoir architecture research and 3D geological modeling are of great significance for reservoir fine description and remaining oil exploration. Taking Donghe sandstone shore reservoir in Hudson oilfield as an example, this paper established the modeling method of sandy shore reservoir architecture. At home and abroad, there is little research on the architecture of shore facies reservoir, and there is no mature research method for its architecture modeling. At the same time, Donghe sandstone reservoir in this area has the characteristics of large buried depth and thin reservoir, which increases the difficulty of geological modeling. In view of the above problems, first of all, GR and DEN curves are selected by using coring well data to classify and identify the architecture interface of shore facies reservoir. Taking the sedimentary genetic model as the constraint condition, the architecture model is determined. By using the method of combining vertical well with horizontal well, the quantitative relationship between the thickness and the extension length in the direction of parallel and vertical paleoshoreline is obtained. Under the constraints of architecture model and quantitative formula, a multi-level coupling method is used to establish a 3D geological model. The results show that the third-order and fourth-order configuration interfaces play a major role in controlling oil and water. The extension length of the fourth-order architecture interface is 516-4560m parallel to the paleoshoreline, 439-2549m vertically, and the length-width ratio is 1.8:1; The extension length of the third-order architecture interface is 344-1509m parallel to the paleoshoreline, 265-974m vertically, and the length-width ratio is 1.7:1. It is proved that the architecture model established by this method has the advantages of strong rationality and high reliability.