Method for determining air/water relation by using compact sandstone microscopic aperture structure

Abstract

The invention discloses a method for determining air / water relation by using a compact sandstone microscopic aperture structure. The method comprises the following steps: according to pore throat median radius, porosity and permeability of a compact sandstone sample on each storage layer of a sampling well, establishing a calculating model of pore throat median radius, porosity and permeability; according to the porosity and permeability of the compact sandstone sample on each storage layer of the sampling well by the calculating model, calculating the pore throat median radius of the compact sandstone sample on each storage layer of the adjacent well, according to power condition and porosity change of a compact sandstone gas reservoir with different depth or reservoir dynamic evolution, establishing a change model of a storage state of compact sandstone air / water on each storage layer; according to the change model and the pore throat median radius, predicting the air water distribution characteristic and output state of compact sandstone on each storage layer. The above technical scheme can predict air water distribution characteristic and output state of compact sandstone, so that oil gas drilling success rate can be increased.

Description

technical field [0001] The invention relates to the technical field of oil and gas resource exploration, in particular to a method for determining the gas-water relationship by using the microscopic pore structure of tight sandstone. Background technique [0002] At present, scholars at home and abroad have realized that the microscopic pore structure plays an important role in controlling the distribution of gas and water. The distribution of gas and water is related to the tightness and strong heterogeneity of the reservoir. The collective is water-bearing, but it is very weak to clarify the control effect of microscopic pore structure on the distribution of fluid properties from the microscopic mechanism, and the research and prediction of fluid properties and distribution on the complex gas-water distribution relationship and production state are very weak, especially in tight sandstone reservoirs There is no relevant report on the scientific issue of the relationship be...

AI Technical Summary

Problems solved by technology

[0002] At present, scholars at home and abroad have realized that the microscopic pore structure plays an important role in controlling the distribution of gas and water. The distribution of gas and water is related to the tightness and strong heterogeneity of the reservoir. The collective is water-bearing, but it is very weak to clarify the control effect of microscopic pore structure on the distribution of fluid properties from the microscopic mechanism, and the research and prediction of fluid properties and distribution on the complex gas-water distribution relationship and production state are very weak, especially in tight sandstone reservoirs There is no relevant report on the scientific issue of the relationship between microscopic pore structure and gas-water distribution.

[0003] For tight sandstone gas reservoirs, due to the urgent need to solve the scientific problem of complex gas-water distribution variation law in the microscopic mechanism, it is impossible to carry out objective and scientific quantitative prediction and effective synthesis of tight sandstone gas reservoirs. evaluation, seriously affecting the exploration and development results of this type of unconventional gas reservoirs

Images