The present invention relates to a method of locating oil and gas exploration prospects. The key comprises a swingable key body formed with an embedding hole which extends through a front plate in the vertical direction to reach the key body, and a weight made of an alternative material other than lead. The formulated oil has a composition including a major amount of a lubricating oil base stock and a minor amount of metal phosphate nanoplatelets. The motion of the second end of each spring model is prescribed using positioning parameters andor properties of each spring model are specified using spring parameters so that each attachment point is pulled to its final position through tension on the spring models.