大王北洼陷沙二段成藏模式探讨

Preliminary discussion on accumulation mechanismof the second member of Shahejie
Formation in Dawangbei Sag

徐刚 国梁

胜利油田分公司河口采油厂，山东 东营 257200

Hekou Oil Production Plant, Shengli Oilfield Company，SINOPEC，Dongying 257200, China

根据3次资源评价结果，济阳坳陷车镇凹陷的石油总资源量为5.6×108 t，而实际探明资源量则不足1.5×108 t，因此，车镇凹陷仍具有较大潜力。大王北洼陷是车镇凹陷的一个重要次洼，属于油气较为富集的构造带。通过对大王北洼陷带沙二段油藏构造、地层、沉积及成藏系统的分析，建立了大王北洼陷的层序地层格架，明确了层序Ⅱ是该区带沙二段的主力含油层序。提出大王北洼陷带沙二段油藏具有2套差异较大的成藏系统，即大65成藏系统和英雄滩复合成藏系统，阐述了大王北洼陷带控制沙二段油气的主要因素，揭示了该区带沙二段的成藏规律和成藏模式，指明了该区下一步的勘探工作方向。

According to the Third Resource Appraisal result，the total amount of petroleum resources in Chezhen Sag of Jiyang Depression is 0.56×10⁹ tons，but only less than 0.15×10⁹ tons has been found in the area, and it is expected a great potential in the area. Dawangbei Sag is an important subsag of Chezhen Sag in Jiyang Depression and it is a structure belt with oil and gas concentration. Through the analysis to the reservoir structure, the stratum，the deposition and the accumulation system, the paper elaborates the primary factor controlling oil gas pools in the second member of Shahejie Formation. It also shows the rules of oil accumulation，and indicates the direction of exploration potential in the lower section