Accumulation Conditions and Model of Deep Oil and Gas in Southern Raoyang Sag of Bohai Bay Superimposed Basin
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摘要: 为明确饶阳凹陷南部深层油气成藏条件与富集规律，破解资源潜力不清、储层非均质性强及成藏模式不明等勘探难题，系统分析了构造背景、烃源岩特征及储层发育机制，并建立成藏模式加以验证.结果表明，沙三下亚段发育半咸湖相优质烃源岩，辫状河三角洲砂体经有机酸溶蚀及早期油气充注形成有效储层，大型拆离滑覆构造控制多个有利背斜带，据此建立了源内、近源两种成藏模式.依据近源模式部署的Q104X井获高产工业油流，实现深层勘探重大突破.饶阳凹陷深层具备规模成藏条件，为冀中坳陷及类似陆相断陷盆地深层油气勘探提供了重要借鉴，对老油区资源接替与增储上产具有重要意义.Abstract: To clarify the hydrocarbon accumulation conditions and enrichment patterns in the deep strata of the southern Raoyang Sag, and to address the exploration challenges of unclear resource potential, strong reservoir heterogeneity, and unknown accumulation models, this study systematically analyzed source rock characteristics, reservoir development mechanisms, and structural settings, and subsequently established and validated accumulation models. The results show that the lower submember of the third member of the Shahejie Formation (Es3下) developed high-quality source rocks in a semi-saline lacustrine environment. Braided river delta sand bodies formed effective reservoirs through organic acid dissolution and early hydrocarbon charging. A large-scale detachment and decollement structural setting controlled multiple favorable anticlinal belts. Based on these findings, two accumulation models (intra-source and near-source) were established. Following the near-source model, Well Q104X was drilled in the Yangwuzhai structural belt and yielded high-yield industrial oil flow, achieving a major exploration breakthrough in the deep strata. This study confirms that the deep strata of the Raoyang Sag possess conditions for large-scale hydrocarbon accumulation. The results provide an important reference for deep petroleum exploration in the Jizhong Depression and similar continental rift basins, and are of great significance for resource replacement and reserve/production growth in mature oil regions.
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图 1 饶阳凹陷构造纲要图（a）及综合柱状图（b）
Fig. 1. Structural outline map (a) and composite columnar section (b) of the Raoyang Sag
图 2 饶阳凹陷南部T5反射层构造图（相当于沙三段顶面）
Fig. 2. Structural map of the T5 reflection layer (corresponding to the top surface of the Es3 member) in the southern Raoyang Sag
图 4 饶阳南部沙三上亚段（a）和沙三下亚段（b）烃源岩等厚图（TOC > 1%）
Fig. 4. Isopach map of source rocks of Es3上 (a) and Es3下（b）in the southern Raoyang Sag (TOC > 1%)
图 5 饶阳凹陷南部烃源岩实测参数
Fig. 5. Measured parameters of source rocks in the southern Raoyang Sag
图 7 饶阳凹陷南部沙三下亚段岩相古地理图
Fig. 7. Lithofacies paleogeographic map of Es3下 in the southern Raoyang Sag
图 8 饶阳凹陷南部沙三段沉积相联井剖面图
Fig. 8. Correlation profile of sedimentary facies ofEs, in the southern Raoyang Sag
图 9 饶阳凹陷南部沙三下亚段储层储集空间特征照片
Fig. 9. Photographs showing reservoir space characteristics of Es3下reservoirs in the southern Raoyang Sag
图 10 饶阳凹陷南部沙三下亚段烃类包裹体显微照片（左：透射光；右：荧光）
Fig. 10. Photomicrographs of hydrocarbon inclusions of Es3下in the southern Raoyang Sag (left: transmitted light; right: fluorescence)
图 11 CS1井4 296.57、4 541.45 m沙三下亚段包裹体均一温度分布
Fig. 11. Homogeneous temperature distribution of fluid inclusions in the Es3下 at depths of 4 296.57 m and 4 541.45 m in Well CS1
图 12 饶阳凹陷南部CS1井埋藏史及烃类流体充注期
Fig. 12. Burial history and hydrocarbon fluid charging stages of Well CS1 in the southern Raoyang Sag
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