浅层油气运聚理论与渤海大油田群的发现

发布时间：2018-05-06 02:07

本文选题：渤海油区 + 浅层油气藏　；参考：《石油学报》2017年01期

【摘要】：渤海油区年产原油3 000×10~4t,约占中国海洋石油产量的70%。渤海油区位于渤海湾新生代陆内裂谷盆地的中东部,勘探面积约4.5×104km2。渤海油区具有鲜明的石油地质特征:著名的郯庐大断裂纵贯渤海,新近纪断裂活动强烈,促进石油的纵向运移,但不利于油藏的保存;中新世—上新世发育河湖相沉积,上部储-盖组合广泛分布,为浅层石油富集创造了条件;古近系生油岩埋藏深,新近系储-盖层较浅,石油垂向运移距离远,运移途径复杂。针对渤海复杂的石油地质条件,经过20年认识—实践—再认识的探索,提出1大断裂-砂体"中转站"模式运移能力强、2小断层及走滑断裂运移油气能力弱、3地层—断层组合关系控制油气富集部位、4临界盖层控制断裂活动带油田形成、5圈闭汇油面积大小决定油田规模、6主力油田展布可分为凸起与凹陷富集型、7小凸起上的披覆背斜利于形成大油田7项创新学术思想,构成了浅层油气运聚理论并指导勘探,渤海勘探团队在短期内高效发现了7个大油田、17个中型油田,共27×10~8 m~3地质储量,奠定了中国第二大油区的储量基础。
[Abstract]:The Bohai oil region produces 3 000 脳 10 ~ (4) tons of crude oil per year, accounting for about 70% of China's offshore oil production. The Bohai oil area is located in the central and eastern part of the Cenozoic intracontinental rift basin in the Bohai Bay. The exploration area is about 4.5 脳 104 km2. The Bohai oil area has distinct petroleum geological characteristics: the famous Tan-Lu fault runs across the Bohai Sea, the Neogene fault activity is strong, which promotes the vertical migration of oil, but is not conducive to the preservation of the reservoir, the Miocene to Pliocene developed fluvial and lacustrine facies deposits, The upper reservior-cap assemblage is widely distributed, which creates conditions for shallow oil enrichment, the Paleogene source rocks are buried deep, the Neogene reservoirs and caprocks are shallow, the vertical oil migration distance is long, and the migration path is complex. In view of the complex petroleum geological conditions in the Bohai Sea, after 20 years of cognition, practice and recognition, It is put forward that 1 large fault-sand body "transfer station" mode migration ability is strong and small fault and strike slip fault migration ability is weak. The relation between formation and fault assemblage controls the oil field shape of fault active zone controlled by critical caprock in oil and gas enrichment site. The size of the trap area determines the size of the oil field and the distribution of the main oil fields can be divided into uplift and drape anticline on the small uplift of the enriched type of depression, which is conducive to the formation of seven innovative academic ideas in large oil fields. The shallow oil and gas migration and accumulation theory has been formed and guided exploration. In the short term, the Bohai exploration team has found 7 large oil fields and 17 medium oil fields, with a total geological reserves of 27 脳 10 ~ (8) m ~ (-3), which has laid the foundation of reserves in the second largest oil region in China.
【作者单位】：中海油研究总院;中海石油(中国)有限公司天津分公司;
【基金】：国家重大科技专项“近海富烃凹陷资源潜力再评价和新区、新领域勘探方向”(2008ZX05023-001)资助
【分类号】：P618.13

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