Exploration (Petroleum) : Any well-drilling or associated activity undertaken for the purpose of identifying petroleum, or petroleum-bearing or petroleum-generating strata, where the depth of the well is 10 m or greater
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}