基于双重孔隙理论的各向异性致密油砂岩地震岩石物理模型

致密油砂岩储层低孔低渗、矿物组分多样以及孔隙结构复杂,为岩石物理建模带来了较大挑战。基于致密油砂岩的特殊性,从岩石固体组分和孔隙结构2个方面对致密油砂岩地震岩石物理模型做了改进,实现了基于双重孔隙理论的各向异性致密砂岩油储层的岩石物理建模方法,并系统研究了新理论模型下泥质含量和泥质类型、孔隙连通性以及孔隙类型4种因素对岩石物理建模的影响。研究结果表明,泥质、孔隙连通性和孔隙类型对致密油砂岩均会产生较大的影响,证实了所提出的岩石物理建模方法的合理性。

Anisotropic seismic rock physics model of tight oil sandstone based on double-porosity theory

Tight oil sandstone reservoirs are characterized by low porosity, low permeability, diversified mineral components and complex pore structures, leading to a great challenge for rock physics modeling. Based on the specialty of tight oil sandstone, seismic rock physics model of tight oil sandstone was improved from two aspects, i.e., solid components and pore structures of the rocks, so as to achieve the rock physics modeling for anisotropic tight oil sandstone based on double-porosity theory. Moreover, the influences of four factors, i.e., clay content and type, pore connectivity and type, on rock physics modeling were studied systematically using the new theoretical model. The results show that the clay, pore connectivity and pore type will have great impacts on tight oil sandstone, proving the rationality of rock physics modeling.