Define exploration in each area as long as each cross line, 25 yards, and defined the area preserve, for example, a circle with a radius of 5 metres long and four corner of exploration: images.
Be the block in each area is crossed by the line length of 25 meters and set in the same sample in a circle with a radius of 5 meters at the 4 corners of the block as shown below.
Determining petroleum in each area is a cross each long 25 meters. The area of sample is a circle with a radius 5 meters long corners 4 of petroleum as shown below.