An early identification method for gas reservoir driving energy

By plotting apparent geological reserves curves for gas reservoirs and pressure recovery curves from time-lapse well tests in single wells, and combining these with the material balance equation, the problem of early identification of energy supply sources for complex sandstone gas reservoirs was solved, ensuring the accuracy of dynamic reserves calculation and the reliability of development policies.

CN122311037APending Publication Date: 2026-06-30HAINAN BRANCH OF CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HAINAN BRANCH OF CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD
Filing Date
2026-03-17
Publication Date
2026-06-30

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Abstract

This invention discloses an early identification method for driving energy in gas reservoirs, including steps such as plotting the apparent geological reserve curve of the gas reservoir; obtaining the time-lapse well test results of gas wells in the research target area and plotting the pressure recovery curve of a single well during the time-lapse well test; and using the apparent geological reserve curve of the gas reservoir in combination with the pressure recovery curve of a single well during the time-lapse well test to identify the energy supply source of complex sandstone gas reservoirs in the early stage. This invention, by utilizing the apparent geological reserve curve and combining it with the interpretation results of time-lapse well tests, solves the problem of traditional methods struggling to determine whether the energy supply source is water intrusion or gas conduction in the early stages of development. It addresses the problem of multiple solutions in the calculation of dynamic reserves in material balance from the source, thereby avoiding the risk of development policy errors caused by cognitive biases.
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