Target drilling sites include areas where the mantle has been brought closest to the surface by tectonic action or where the crust is relatively thin , such as the nankai trough off japan ' s pacific coast 鉆探的目標包括了某些因板塊運動而使地函接近地表的區(qū)域,或是地殼相對較薄的地方,例如日本太平洋海岸外的南海海槽。
Bozhong area has different oil - gas accumulation characteristics from the adjace nt onshore oil fields . because of the latter thermal event and tectonic action , bo zhong area became the subsidence center and depo - center of the bohai bay basin 其具有不同于周邊陸地油田的油氣成藏特點,晚期的熱沉降和構造活動使其成為渤海灣盆地的沉降和沉積中心,上第三系具有優(yōu)于周邊陸地油田的良好的儲蓋條件,晚期的構造活動與油氣主要排烴期相匹配,為油氣向上第三系圈閉中運聚提供了良好條件。