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Trap reliability evaluation is mainly based on the trap plan and the main seismic sections passing through the trap to analyze the reliability of the identified traps and evaluate the reliability of the traps.

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During the trap preparatory prospecting，the number of wildcat well mainly depends on the size of the trap, the type of oil and gas reservoir, the complexity of the trap and the degree of research on regional geology.

During trap preparatory prospecting, the wildcat well are divided into discovery wells, rapid drilling wells, key coring wells, and backup wells according to the order of drilling and the degree of necessity.

When trap preparatory prospecting the exploration wells should be located on the same contour line to facilitate edge exploration.

The purpose of a certain well layout system is to ensure that drilling is done in favorable locations for oil and gas accumulation, so as to facilitate the well drilling underground geological data of research .