冀中坳陷中央断裂构造带潜山发育特征及成藏模式

Development characteristics of buried-hill and reservoir-forming pattern in central faulted structural belt of Jizhong Depression

由于独特的构造演化,冀中坳陷潜山圈闭十分发育,从而成为重要的勘探领域。冀中坳陷潜山构造带可以划分为陡坡、缓坡和中央断裂潜山构造带3种类型。根据中央断裂潜山构造带的构造发育特征、储盖组合特征、封闭保存特征以及油气供给方式,将中央断裂构造带潜山油气成藏划分为3种模式,即:以任丘潜山构造带为代表的早隆-中埋-晚稳定型成藏模式、以河西务潜山构造带为代表的早埋-中隆-晚稳定型成藏模式、以及以肃宁潜山构造带为代表的早隆-中埋-中稳定型成藏模式。研究表明,构造作用控制潜山的规模和油气的供给方式,对潜山储层的发育及油气的保存也有重要的影响。3种模式中以早隆-中埋-晚稳定型各种成藏要素匹配最好,成藏条件最佳。

The buried-hill traps and reservoirs were well developed in Jizhong Depression,because of its particular structural evolution pattern.The buried-hill structural belt in Jizhong Depression can be classified into three types of steep slope belt,gentle slope belt and central faulted structural belt.According to the characteristics of structural development,reservoir-cap rock assemblage,sealing-storage property and hydrocarbon sources in the central faulted structural belt,three reservoir-forming patterns were identified,including the early uplifted,middle buried and late stabilized pattern such as the Renqiu buried-hill structural belt,the early buried,middle uplifted and late stabilized pattern such as the Hexiwu buried-hill structural belt and the early uplifted,middle buried and middle stabilized pattern such as the Suning buried-hill structural belt.The research indicated that tectonics controlled the buried-hill size and hydrocarbon source types and also had the important effects on the development of buried-hill reservoirs and hydrocarbon storage.Among the three reservoirs-forming patterns,the first one is the best in element matching relationship and the most optimal in reservoir-forming conditions.