A petrophysical model of dual-porosity medium considering diagenetic consolidation and its application
GAO Qiang1, LI Hongbing1, PAN Haojie2
1. Department of Geophysical Exploration Technology, Research Institute of Petroleum Exploration&Development, PetroChina, Beijing 100083, China; 2. College of Geophysics and Petroleum Resources, Yangtze University, Wuhan, Hubei 430110, China
Abstract：Diagenetic consolidation,pore structure,and pore structure type are important factors affecting the elastic properties of tight oil and gas reservoirs. However,most of the existing petrophysical models,focusing on a single pore type or only considering diagenesis,fail to accurately describe the characteristics of tight oil and gas reservoirs such as low porosity and low permeability,uneven fluid distribution,and complex pore structures and pore structure types. Therefore,in this paper,the differential equivalent medium (DEM) theory and the Pride model are fully used to deduce a petrophysical model of a dual-porosity medium considering diagenetic consolidation. Consolidation parameters and the aspect ratios and volume percentages of soft and hard pores are introduced for the joint characterization of diagenesis and microscopic pore structures. The effects of porosity,consolidation parameters,pore aspect ratio,and volume ratio of soft pores on compressional wave velocity,shear wave velocity,and elastic modulus are quantitatively analyzed with this model. The validity and applicability of the model are verified by the experimental data of sandstone and mudstone under different pressures and the experimental data of the Sulige area. Finally,the model is applied to the prediction of shear wave velocity in Sulige tight sandstone gas reservoirs. Compared with the prediction results of other petrophysical models,the shear wave velocity predicted by this model has the smallest error,confirming that the proposed petrophysical model has high prediction accuracy of shear wave velocity in tight sandstone reservoirs.
高强, 李红兵, 潘豪杰. 考虑成岩固结作用的双重孔隙介质岩石物理模型及其应用[J]. 石油地球物理勘探, 2022, 57(1): 149-158.
GAO Qiang, LI Hongbing, PAN Haojie. A petrophysical model of dual-porosity medium considering diagenetic consolidation and its application. Oil Geophysical Prospecting, 2022, 57(1): 149-158.
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