三角洲平原亚相储层砂体静态连通性定量表征——以松辽盆地肇州油田扶余油层为例

发布时间：2018-10-21 18:59

【摘要】：为了解决三角洲平原亚相储层砂体分布复杂和静态连通性评价难的问题,以松辽盆地肇州油田扶余油层为例,综合利用岩心、测井等资料,采用沉积成因类比和概率模型的方法,系统的研究了三角洲平原亚相环境下的储层连通概率,提出砂体几何学特征、井网密度、物源方向和地层砂地比是影响储层静态连通性定量评价的主控因素.研究结果表明:储层连通概率与砂体宽厚比和地层砂地比呈正相关,与井距和物源方向偏角的正弦值呈反相关;三角洲平原亚相主要由单期分流河道、复合分流河道和决口扇3种微相组成,其中单期分流河道宽厚比15~30,复合分流河道宽厚比45~60,决口扇宽厚比和长宽比分别约120和75;当前220m井距条件下,单期分流河道为主的FⅠ4小层砂体连通概率为25%,复合分流河道为主的FⅠ7小层砂体连通概率为55%;单期分流河道、复合分流河道和决口扇砂地比‘瀑布区’范围分别为25%~35%,20%~30%,15%~20%.应用上述方法对评价区进行钻井验证,砂体符合率达87.5%以上.
[Abstract]:In order to solve the problems of complex sand body distribution and difficult static connectivity evaluation in delta plain subfacies reservoir, taking Fuyu reservoir of Zhaozhou Oilfield in Songliao Basin as an example, the core and logging data are comprehensively used. By means of sedimentary genetic analogy and probability model, the reservoir connectivity probability in delta plain subfacies environment is systematically studied, and the geometric characteristics of sand body and well pattern density are presented. The direction of material source and the ratio of formation sand to soil are the main factors influencing the quantitative evaluation of reservoir static connectivity. The results show that the probability of reservoir connectivity is positively correlated with the ratio of width to thickness of sand body and the ratio of sand to ground, and is inversely correlated with the sinusoidal value of well spacing and the deviation angle of source direction, and the subfacies of delta plain are mainly separated by single-stage distributary channel. The composite distributary channel and crevasse fan are composed of three kinds of microfacies, in which the ratio of width to thickness is 1530, the ratio of width to thickness is 4560, the ratio of width to thickness and the ratio of length to width are about 120 and 75, respectively. The connectivity probability of F 鈪，

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