风城油田重32井区SAGD试验区储层构型研究

Reservoir Architecture in SAGD Area of Wellblock Zhong 32 of Fengcheng Oilfield

采用"层次约束、模式指导"的储层构型分析方法,对风城油田重32井区蒸汽辅助重力泄油(SAGD)试验区密井网条件下辫状河砂体构型模式、夹层类型和夹层延伸规模进行了精细描述。通过对露头考察,结合沉积微相精细研究以及生产动态资料分析得出,SAGD试验区的辫状河心滩坝构型具有水平及对称斜列式夹层分布特征,据此建立研究区的辫状河构型分布模式。将与研究区具相似沉积环境的露头夹层规模进行统计,拟合了辫状河心滩坝内部夹层的预测公式,利用区内单井夹层厚度,得到其延伸范围。将构型分析得到的地质认识以参数的形式加入模拟过程,对若干模型进行优选,再通过人机互动的方式,结合构型模式,应用虚拟井完善构型模型,最终建立了符合辫状河砂包泥沉积特征的构型模型。

The reservoir architecture analysis method of'hierarchical constraint and mode guidance'was used for fine describing the architecture mode,intercalation type and scale of the braided river sand body under dense well pattern of SAGD test area in Zhong 32Wellblock of Fengcheng Oilfield.Based on the outcrop investigation and combined with fine description of sedimentary microfacies and production performance data,it was indicated that the architecture of braided channel bar in the studied area had distribution of horizontal and symmetrical diagonal intercalation,based on the study,the distribution pattern of braided river architecture was established.Through statistic analysis of the intercalation scale of the outcrops whose sedimentary environment is similar to the study area,aprediction formula within the intercalation of the braided river mid-channel bar was matched.The interlayer thickness of single well in study area was used to derive its extension range.The geologic recognition obtained from architectural analysis is added as parameter to the simulation process for selecting various models,based on the man-machine interaction and architectural mode,the mode is completed by using virtual wells,eventually the architectural mode of'sand in mud'sedimentary characteristics of braided river is established.