Abstract:

As to Chang 4+5 formation of special low-permeability Baiyushan reservoir in Ordos Basin reservoir, the hydraulic fracture distribution is not regular and difficult to predict. The method of traditional engineering geology and special logging, conventional well logging, micro facies research were combined. Through the stablishment of three-dimensional rock mass mechanics model of reservoir, the full length fracturing numerical simulation was carried out with the change of stress field. More accurate geometry parameters of fractures were got, stress interlayer insulation could be regarded as a kind of new development of geological property which would play an important role in fracture extension, then the development adjustment measures are put forward. The conclusion would provide an important scientific basis on decision-making efficiency in low permeability reservoir development and improve the residual oil recovery degree.

Key words: Ordos Basin, interlayer insulation, pressure fracture, geological modeling

摘要：

基于鄂尔多斯盆地白于山地区延长组长4+5特低渗储层压裂缝分布规律性不强、预测难度大的问题, 采用传统工程地质方法与特殊测井、常规测井、沉积微相研究相结合的方法, 通过建立油藏三维空间展布的地层岩石力学模型, 开展随井间储层和应力场变化的全缝长压裂数值模拟, 得到较精确的压裂缝全缝长几何形态参数, 据此认为应力隔夹层将作为一种新的开发地质属性对压裂缝纵向延伸和水驱波及范围起主导控制作用, 并提出开发调整措施。研究结果可为提高低渗储层的开发决策效率、提高剩余油采出程度提供科学依据。

关键词: 鄂尔多斯盆地, 隔夹层, 压裂缝, 地质建模