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

A technology of tight sandstone gas reservoir and density, applied in the field of oil and gas exploration, can solve the problem of difficult quantitative prediction of critical exhaust intensity

Inactive Publication Date: 2015-04-01
CHINA UNIV OF PETROLEUM (BEIJING)
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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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  • Method and device used for determining critical exhaust strength of tight sandstone gas reservoir exhaust source rocks
  • Method and device used for determining critical exhaust strength of tight sandstone gas reservoir exhaust source rocks

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Embodiment Construction

[0066] The inventors considered the force balance condition in the process of filling the pore throats of tight reservoirs with the natural gas generated in the source rock: when the natural gas generated in the source rock reaches a certain amount, the gas expansion force generated is sufficient to overcome the capillary force and the upper Overlying water column pressure, establishing a method to determine the critical venting strength of effective gas source rocks, so as to determine the critical venting strength of natural gas charging into tight reservoirs under different burial depths, formation temperatures, and pressures, so as to solve the problem of tight sandstone gas The problem of quantitative evaluation of whether the gas source rocks have gas supply availability provides an accurate and feasible method for predicting the critical hydrocarbon expulsion strength of effective gas source rocks in tight gas reservoirs, and then can determine the total amount of gas sup...

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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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V9/00
Inventor 姜福杰庞雄奇白静沈卫兵
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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