双方的协议还规定，初期的勘探期还可以再延续两个阶段，每个阶段各为两年。
The agreement enables this initial exploration period to be extended by two subsequent periods, each of two years.
南堡凹陷火山岩最有利的勘探区带位于北堡构造带的沙3期和沙1-3期，其次为南堡2号构造带东营组。
Nanpu depression volcanic rocks most beneficially reserviors develop in Beipu structural belt of Es3 period and Es1-3stage , secondly for the Nanpu No. 2 structural belt in Ng formation.
油气勘探支出包括钻井勘探支出和非钻井勘探支出。非钻井勘探支出于发生时计入当期损益。
Oil and gas exploration costs include drilling exploration costs and the non-drilling exploration costs. The non-drilling exploration costs are recorded in the income statement when incurred.
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