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The basis of the evaluation of the confidence of the trap economy is mainly the PIIP of trap and the results of the economic evaluation of the trap. Generally, a quantitative evaluation method is adopted to calculate the economic confidence coefficient.

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In the quantitative evaluation of trap geological confidence, the trap reliability coefficient and the probability of trap oil and gas are mainly used to quantitatively calculate the trap geological confidence coefficient.

For the traps that have been drilled, the 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.

For the traps that have 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 oil testing. Compared with the traps that obtain industrial oil and gas flow, the various geological conditions for accumulation are More favorable.

According to their tasks, trap preparatory prospecting wells can be divided into three categories: fast drilling wells, stratified oil test wells and key coring wells.