Shale organic porosity detection method

Abstract

The invention discloses a shale organic porosity detection method, and belongs to the technical field of petroleum, geology and mining exploration and development. The shale organic porosity detection method comprises the steps of calculating chemical kinetic parameters of petroleum formation from kerogen, gas formation from kerogen and gas formation from crude oil pyrolysis by utilizing a chemical kinetic method based on the thermal simulation experiment of a shale sample and a crude oil sample with representativeness, and determining the conversion rate of the petroleum formation from kerogen, gas formation from kerogen and gas formation from crude oil pyrolysis of shale at the study layer section by combining with the burial history and thermal history of a target layer; recovering the original hydrogen index and the original organic carbon of shale of the target layer by utilizing residual hydrogen index and data of residual organic carbon of shale of the target layer and combining with the conversion rate of the petroleum formation from kerogen, gas formation from kerogen and gas formation from crude oil pyrolysis; analyzing the organic pore compressibility of shale by utilizing a Ar ion polishing thin sheet of a shale sample of the target layer; calculating the organic porosity of the shale sample of the target layer section. The shale organic porosity detection method has the effects that the organic porosity of the reservoir of shale can be calculated, and the shale organic porosity detection method is high in calculation accuracy, and is easy to operate.

Description

technical field [0001] The invention relates to a method for detecting the organic porosity of mud shale, belonging to the technical fields of petroleum, geology, and mining exploration and development. Background technique [0002] The organic pores of mud shale refer to the pores existing in the organic matter particles of mud shale with a pore diameter of nanometer scale. In the process of exploration and development of shale oil and shale gas, organic porosity is one of the key parameters for calculating shale oil and shale gas resources and making development plans. The organic porosity of shale oil and shale gas reservoirs directly affects the amount of oil and gas resources in the organic part of shale reservoirs, and is an important basis for analyzing the ratio of shale gas adsorption and free states. Shale reservoirs are different from conventional reservoirs in that they are ultra-low porosity, ultra-low permeability and rich in organic matter. Generally, the or...

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Problems solved by technology

[0008] The gas adsorption-desorption method uses nitrogen, carbon dioxide and other gases with different molecular diameters to measure the pore space volume and connectivity of the corresponding pore size. This method analyzes interconnected pores and cannot evaluate the non-interconnected pores in shale reservoirs.

Electron microscopic imaging technology can obtain high-magnification rock photos, which can clearly reflect the pore characteristics of the two-dimensional section, but cannot quantitatively evaluate the porosity

Using the mercury injection method to analyze the porosity of shale requires drilling a standard core column, and the success rate of drilling a core column is low. In addition, the mercury injection method can only measure pores with a diameter greater than 1000nm and interconnected pores

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