Stress-sensitive compact sandstone reservoir physical model material, stress-sensitive compact sandstone reservoir physical model and preparation method of stress-sensitive compact sandstone reservoir physical model

Abstract

The invention belongs to the technical field of seismic physical models of oil-gas exploration geophysics, and discloses a stress-sensitive compact sandstone reservoir physical model material, a stress-sensitive compact sandstone reservoir physical model and a preparation method. The physical model material comprises quartz sand, kaolin, polyurethane, a curing agent and a diluent. The method comprises the following steps: carrying out heating treatment on polyurethane and a curing agent; performing curing pretreatment on the inner surface of the physical model curing mold; uniformly mixing the quartz sand and the kaolin, adding polyurethane, a curing agent and a diluent, and uniformly mixing to obtain a mixture; and putting the mixture into a physical model curing mold, and carrying out pressing treatment and curing treatment on the mixture to obtain the stress-sensitive compact sandstone reservoir physical model. According to the method, the soft organic material is used for cementing the quartz sand and the kaolin, so that physical simulation research on the ground stress-seismic response change rule of the compact sandstone reservoir is realized.

Description

technical field [0001] The invention belongs to the technical field of seismic physical models for oil and gas exploration geophysics, and in particular relates to a stress-sensitive tight sandstone reservoir physical model material, a stress-sensitive tight sandstone reservoir physical model and a preparation method. Background technique [0002] With the continuous deepening of exploration, unconventional tight sandstone reservoirs have become the focus and hotspot of oil and gas exploration, and the proportion of their oil and gas reservoir reserves in newly proven crude oil and natural gas geological reserves is increasing year by year. Sandstone with porosity below 12% and permeability below 0.1mD is generally considered as tight sandstone reservoir. The exploration and development of tight sandstone reservoirs is closely related to in-situ stress, and determining the magnitude and direction of in-situ stress can provide an optimal solution for reservoir development des...

AI Technical Summary

Problems solved by technology

The existing artificial sandstone materials are made by using organic or inorganic cement to cement quartz sand, which can simulate conventional sandstone with high porosity and high permeability, but it is difficult to simulate the physical properties of tight sandstone

In addition, the two existing physical model materials for sandstone reservoirs are not stress-sensitive, that is, the physical parameters are difficult to change significantly after the simulated stress is applied, and it is difficult to simulate the influence of stress on the actual formation physical parameters.

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