页岩岩石物理建模研究

Research on Shale Rock Physics Modeling

页岩气是一种非常重要的非常规油气资源,页岩气储层不同于常规油气储层,其具有较强的各向异性、矿物成分复杂、孔隙多样等特征,使得岩石物理建模会更加复杂,很多岩石物理模型对页岩描述不够准确。此文从岩石物理模型的基本理论出发,针对Bakken页岩进行各向异性DEM岩石物理建模,具有较好的预测结果,通过比较发现干酪根作为基质时模型更优。并且在Wu建模流程的基础上,进一步考虑了当页岩存在垂直裂缝时,具有正交各向异性,建立了正交各向异性岩石物理模型,使得岩石物理模型更加接近真实页岩。

Shale gas is a very important unconventional oil and gas resource. The shale gas reservoir is different from the conventional oil and gas reservoir. It has strong anisotropy, complex mineral composition, diverse pores and other characteristics, which makes the rock physics models more complex, and many rock physics models are not accurate enough to describe the shale. Starting from the basic theory of rock physics model, this paper conducts anisotropic DEM rock physics modeling for Bakken shale with better prediction results. It is obvious that the model is better when kerogen is used as matrix by comparison. Moreover, on the basis of Wu modeling process, it is further considered that when there are vertical fractures in the shale, an orthotropic rock physics model is established to make the rock physics model closer to the real shale.