辫状河储集层夹层发育模式及其对开发的影响--以准噶尔盆地风城油田为例

Intercalation pattern and its impact on development of braided river reservoirs: A case of Fengcheng Oilfield, Junggar Basin, NW China

通过对露头原型模型、岩心和测井综合分析,基于砂体构型,研究准噶尔盆地风城油田辫状河储集层内部夹层类型、形成机理和分布模式,并对夹层进行井间分布预测。风城油田辫状河储集层内部夹层分为4类:坝内夹层、坝间夹层、道坝转换夹层和串沟,岩性上可分为泥质砂岩夹层和细粒夹层两种类型。利用岩心刻度测井进行单井夹层识别,应用多点统计学方法建立夹层训练图像,进行井间夹层分布预测,结果表明,夹层整体上大小不一、分布零散,呈薄厚不等的透镜状分布。应用夹层三维模型指导B试验区水平井设计,实践表明夹层预测对提高原油产量具有重要意义。

Through comprehensive analysis of outcrops, core data and well logs, the type, formation mechanism and distribution pattern of intercalations in the braided river reservoirs of Fengcheng Oilfield, Junggar Basin are studied based on the reservoir architecture, and the inter-well distribution is predicted. The intercalations in Fengcheng Oilfield are divided into four types： intercalation in a bar, intercalation between bars, channel-bar transitional intercalation and chute. The intercalations include two lithologic types： argillaceous sandstone and fine grains. The intercalations are recognized in each individual well by core scale logging. Inter-well prediction is achieved by training image of intercalations established by multi-point statistics. The result indicates that the intercalations are not the uniform size and are scattered with lentoid distribution of various thicknesses. The horizontal wells in test area B are designed by the guidance of intercalation 3-D model, and practice indicates that the intercalation prediction is of great importance for improving oil production.