Method and device used for determining critical exhaust strength of tight sandstone gas reservoir exhaust source rocks

Abstract

The invention provides a method and a device used for determining critical exhaust strength of tight sandstone gas reservoir exhaust source rocks. The method comprises steps that, stratum data of a target interval of a tight sandstone gas reservoir research zone is acquired, stratum hydrostatic pressure, gas water interface tension force under the stratum condition, natural gas compression factors and capillary force are determined according to the acquired stratum data, gas bulging force under the force balance condition is calculated, and the critical exhaust strength is calculated according to the stratum temperature, effective hydrocarbon source rock thickness, hydrocarbon source rock porosity and natural gas substance amount of the acquired stratum data, and the natural gas compression factors and natural gas density acquired through calculation. The method solves a technical problem of difficulty in quantitatively predicting the critical exhaust strength of the tight sandstone gas reservoir exhaust source rocks in an oil gas basin in the prior art, improves exploration efficiency of tight sandstone gas and reduces risks in exploring tight sandstone gas reservoirs.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration, in particular to a method and a device for determining the critical exhaust intensity of exhaust source rocks in tight sandstone gas reservoirs. Background technique [0002] Tight sandstone gas reservoir is an important unconventional gas reservoir. At present, the world's available tight sandstone gas reserves are about 10.5×10 12 ~24×10 12 m 3 , ranking first in unconventional natural gas, with great resource potential. Tight sandstone gas accumulation mechanism and accumulation process are very complex, and many scholars have also studied the formation conditions of tight sandstone gas reservoirs, for example: Berkenpas PG pointed out that the formation of tight sandstone gas reservoirs is not affected by buoyancy, but by hydrocarbons Control of internal pressure of source rocks; Pang Xiongqi proposed that gas expansion force is the main driving force for natural gas to cha...

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Problems solved by technology

[0004] The embodiment of the present invention provides a method for determining the critical exhaust intensity of exhaust source rocks in tight sandstone gas reservoirs, so as to solve the problem of critical exhaust intensity quantification of exhaust source rocks in tight sandstone gas reservoirs in oil and gas basins in the prior art Anticipating difficult technical issues, the method includes:

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