原油相对密度预测模型研究——以东辛油田辛11断块区为例

Forecasting model of relative oil density—A case study on Xin 11 fault block of Dongxin Oilfield

原油密度是油藏工程计算和石油储量评价中不可缺少的重要物性参数,但目前其模型预测方法还较少。通过对瑞利模型和指数预测模型公式的推导,利用济阳坳陷东辛油田辛11断块区实际流体性质的开发动态数据进行分析,建立了原油相对密度随开采时间变化的地质预测模型。模型研究表明,原油密度随开采时间的变化具有瑞利模型和指数模型2种变化规律,且瑞利模型能够较为准确地预测原油相对密度的开发动态,但2种模型在对原油密度进行预测时均受到油藏构造部位、开采层位以及油源性质等因素的影响。

Oil density is an important parameter in reservoir engineering and reserve estimation, but the forecasting means are limited. Rayleigh model and exponential model are applied to analyze data of development performance in Xin 11 fault block, Dongxin Oilfield, Jiyang depression. A geological forecasting model of relative oil density changing with recovery time has been established. The research indicates that the change of oil density with recovery time shows both the characteristics of Rayleigh model and exponential model. Rayleigh model predicts relative oil density more accurately. Both models are affected by structure location, producing position and oil source property when forecasting oil density.