A tight sandstone gas reservoir forming probability determination method and device

Abstract

The invention provides a tight sandstone gas reservoir forming probability determination method and device. The method comprises the steps of: according to sedimentary facies distribution data of a to-be-measured reservoir, determining a first reservoir forming probability; based on the relation between the porosity critical value and the depth in conversion of a gas layer to a dry layer in the to-be-measured reservoir, determining a second reservoir forming probability; determining a third reservoir forming probability by using the vertical distance between the to-be-measured reservoir and source rock; based on the distribution of cap rock in the to-be-measured reservoir, determining a fourth reservoir forming probability; calculating a reservoir forming probability of the to-be-measured reservoir according to the first reservoir forming probability, the second reservoir forming probability, the third reservoir forming probability and the fourth reservoir forming probability. In the embodiments, sedimentary facies, interfacial potential, source rock and cap rock are important geological factors controlling distribution and development of tight sandstone gas reservoir, so that the reservoir forming probability of the to-be-measured reservoir can be comprehensively calculated according to the reservoir forming probabilities under the four conditions; the new method is provided for quantitative prediction of a tight sandstone gas reservoir forming probability under complicated development conditions, and the exploration efficiency is increased.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a method and device for determining the probability of tight sandstone gas accumulation. Background technique [0002] Tight sandstone gas reservoirs can refer to low-permeability oil and gas reservoirs with low porosity, low permeability, low gas saturation, high water saturation, and slow natural gas flow in sandstone layers. Among them, tight sandstone gas reservoirs are mostly continuously distributed in basins. The structural depth of the center or basin. The exploration and development of conventional oil and gas reservoirs has been difficult to meet the increasing energy demand, so the current exploration targets have gradually shifted from conventional oil and gas reservoirs to unconventional oil and gas reservoirs, especially deep tight sandstone gas reservoirs. [0003] Since the accumulation process of tight sandstone gas will be affected by various geo...

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Problems solved by technology

[0004] The present invention provides a method and device for determining the probability of tight sandstone gas accumulation, so as to solve the problem of tight sandstone gas accumulation being affected by various geological factors in the prior art only based on the reservoir to be measured. The problem of low probability of tight sandstone gas accumulation determined by physical parameters

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