CAJ | 학술논문

加蓬海岸盆地为西非盆地群组成部分，自白垩纪以来，盆地经历了裂谷期、过渡期和被动大陆边缘沉积时期。北加蓬次盆油气成藏以盐上层系为主，油气藏分布受区域构造演化影响，油气聚集带与区域构造带走向一致。上白垩统Azile组泥岩为主要源岩，该套烃源岩在中新世达到生烃高峰。上白垩统Anguille组和Pointe Clairette组砂岩为主要储层，盆地成藏模式为下生上储型，油气以近距离侧向运移为主。盆地存在压力封存箱现象。Anguille组大套泥岩形成了异常压力系统，地层压力系数在1.3~1.66。根据盆地浊积砂体分布特征，认为北加蓬次盆西南部地区上白垩统有效烃源岩和浊积扇均发育的地区油气成藏条件优越，是未来勘探的重点地区。
가봉해안분지위서비분지군조성부분，자백성기이래，분지경력료렬곡기、과도기화피동대륙변연침적시기。북가봉차분유기성장이염상층계위주，유기장분포수구역구조연화영향，유기취집대여구역구조대주향일치。상백성통Azile조니암위주요원암，해투경원암재중신세체도생경고봉。상백성통Anguille조화Pointe Clairette조사암위주요저층，분지성장모식위하생상저형，유기이근거리측향운이위주。분지존재압력봉존상현상。Anguille조대투니암형성료이상압력계통，지층압력계수재1.3~1.66。근거분지탁적사체분포특정，인위북가봉차분서남부지구상백성통유효경원암화탁적선균발육적지구유기성장조건우월，시미래감탐적중점지구。
Gabon coast basin is one of the West Africa group basins. Since Cretaceous, Gabon basin undergoes lift period, transi?tion period and passive continental margin period. Oil reservoirs in North Gabon sub-basin mainly locate in post salt layers, which are controlled by regional tectonic framework, and regional structural belt is identical with oil and gas concentration zone. Azile mudstone of Upper Cretaceous which reaches generate-oil and gas peak in Miocene Period of Tertiary is the main source rock in this area. Anguille of Upper Cretaceous and member Clairette of Pointe sandstone are the main reservoirs in this district, of which the type of oil and gas reservoirs is upper source rocks and lower reservoir rocks, and the oil and gas migration is in a short dis?tance. There is pressure close box in oil reservoir. Because Anguille sandstone is limited by surrounding mudstones, abnormal pres?sure system appears in Anguille oil reservoirs whose pressure coefficient reaches 1.3~1.66. According to Anguille sandstone distri?bution, the developed effective source rocks and turbidite fan areas in this district with the favorable accumulation conditions are the key areas of future exploration.