埕岛油田的结晶基底为太古界花岗片麻岩，沉积基底为古生界碳酸盐岩和中生界碎屑岩。
Chengdao oil field has a crystalline basement of Achaean granite gneiss and a sedimentary basement of Paleozonic carbonate rock or Mesozonic clastic rock.
长石石英云母片岩、石英岩和大理岩的原岩为沉积岩，与副变质的长英质片麻岩和基性火山岩—起构成了古老的表壳岩组合。
The quartz-mica schist, quartzite and marble were metamorphosed sedimentary rocks, and, together with paragneiss and mafic rock, constituted the old supracrustal series.
磁铁矿片麻岩的泥质矿物特征和碎屑锆石的存在表明，原岩不是一个纯化学沉积体。
The pelitic mineralogy of the magnetite gneiss and presence of detrital zircon demonstrate that the protoliths were not a pure chemical sediment.
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