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Trap preparatory prospecting wells can be divided into independent wells, auxiliary wells and backup wells according to their tasks.

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For traps that have not been drilled, the Class I traps in the evaluation of trap geological confidence refer to the low-yield oil and gas flow obtained after drilling and formation testing. Compared with the traps that have obtained industrial oil and gas flow, the various geological conditions of accumulation are More favorable.

For traps that have not been drilled, Class I traps in the evaluation of trap geological confidence refer to the traps that are reliable and have favorable geological conditions for accumulation, which can provide preparatory prospecting.

In the evaluation of trap geological confidence, the trap can be qualitatively graded and evaluated according to the reliability of the trap implementation and the results of the geological validity evaluation.

The basis of trap geological confidence evaluation is the results of trap reliability evaluation and geological validity evaluation. Only the traps evaluated as reliable or more reliable can be comprehensively evaluated and become drilling targets.