从类比中探索Muglad与Melut两大盆地勘探潜力与转型

Study Exploration Potential and Transformation of Muglad Basin and Melut Basin on Basis of Analogy

Muglad盆地和Melut盆地是中非裂谷系中油气资源最丰富的两个盆地,中国石油自1995年介入苏丹地区的油气勘探以来,在两大盆地迅速发现了一批大油田,使苏丹地区快速发展成为中国石油"海外大庆"的重要支柱。目前两大盆地已进入高成熟勘探阶段,需要进行勘探上的转型,以实现油田的平稳、可持续发展。以Muglad和Melut两大盆地石油地质条件和勘探实践为基础,论述了两大盆地进行勘探转型的必然性;同时,通过与国内渤海湾、松辽等相似裂谷盆地的类比研究,明确了新层系、主力产层岩性油气藏、近岸水下扇、扇三角洲及深层天然气是两大盆地重点潜力领域,可以从"三个勘探转移"来实现两大盆地的勘探转型,即"从主力产层向非主力产层转移,实现多层系勘探,立体勘探;从构造油藏向岩性地层油藏转移,实现勘探目标多样化,充分挖潜地下资源;从单一油藏勘探转向深浅层整体部署,油、气藏统一评价"。通过类比研究,坚定了Muglad和Melut两大盆地勘探信心,同时也明确了未来勘探方向。

Muglad and Melut are the two basins richest in oil and gas resources in the Central African rift system. CNPC has found a large number of large oil fields in the two basins since its involvement in Sudan＇s oil and gas exploration in 1995. Currently, the two basins are in their mature exploration stage and need to have a new pattern of exploration to keep the oilfields for stable and sustainable development. Based on the petroleum geological conditions of Muglad and Melut basins and exploration activities, this paper elaborates on the necessity of exploration transformation in the two basins. Meanwhile, based on analogy with the similar domestic rift basins like Bohai Bay Basin and Songliao Basin, a new series of strata, lithological oil and gas reservoirs, offshore subaqueous fan, fan delta and deep-layer natural gas are clarified as the key areas in the two basins for potential oil exploration and development. Transformation of exploration in the two basins can be realized in three ＂shifts＂ - shift from the main producing horizons to non-main producing horizons for multi-layer exploration, shift from structural oil reservoir to lithological oil reservoir for diversification of exploration targets to fully tap underground resources, and shift from single-reservoir exploration to overall deployment for deep-layers for unified appraisal on oil and gas reservoirs. The analogy research makes CNPC confident about exploration of Muglad and Melut basins and clear about the future exploration targets.