摘要
以天然气的产状为主要标准,考虑到勘探程度和实用性,将渤海海域天然气藏划分为3种类型,即气层气藏、凝析气藏和气顶气藏.研究了不同类型气藏的地质、地球化学特征和形成条件.气层气藏主要分布在渤南地区浅层(上第三系),均为干气气藏.气层气藏中的天然气是来源于深部的石油伴生气,运移分馏作用使得甲烷富集而形成干气气藏.气顶气藏主要分布在下第三系,是在高饱和油藏的基础上,由于不能溶解于石油中的天然气的溢出而形成.凝析气藏存在原生、次生两种类型,分别具有不同的成藏机制.探讨了渤海海域天然气勘探的前景和方向.
According to occurrence of natural gas and in combination with exploration degree and study convenience, gas pools in Bohai Sea are divided into three types, i. e. condensate pool, gas cap pool and gas interval pool, and their geologic and geochemical characteristics and formation conditions are investgated. The gas interval pools are mainly distributed in shallow sequences (Neogene) in Bonan area, which, though coming from deep associated gas of oil, are all dry gas because of methane enrichment by migration fractionation. The gas cap pools, mainly distributed in Paleogene, are formed by spillover of undissolved gas in high saturated oil pools. The condensate pools can be subdivided into primary and secondary types with different origin mechanisms. Finally, the paper discusses exploration potential and targets of natural gas in Bohai Sea.
出处
《中国海上油气（地质）》
2001年第1期72-78,共7页
China Offshore Oil and Gas(Geology)
关键词
渤海海域
天然气藏
类型
形成条件
Bohai Sea
gas pool type
migration fractionation
primary pool
secondary pool
