无论是在石油地质的理论研究中，还是在油田的勘探过程中，圈闭的封盖条件直接影响着油气成藏的有效性和富集规模。莺歌海盆地重力流水道具有典型的分段性和分期性，水道内气藏分布规律复杂，砂体间存在不同的气水界面，油气选择性成藏现象明显，主要受控于圈闭顶部和侧向封闭能力，构造裂缝对气藏的控制以及盖层水力破裂的风险性。本项目以乐东区轴向水道为解剖对象，明确岩性圈闭的顶封和侧封条件，对封盖体开展系统的分析测试，研究高温热流体对含灰质、白云质泥岩封闭性的影响，分析不同方位封盖体的封闭能力。基于区域构造演化，分析裂缝发育规律，明确地震“模糊带”与裂缝带的发育关系，构建“模糊带”裂缝发育的预测方法，探讨裂缝对油气运移和保存的博弈作用。利用包裹体恢复古流体压力，分析水力破裂的演化过程及其对油气成藏的控制作用。最终建立考虑多因素的高温高压重力流岩性圈闭保存条件定量评价体系，为油田寻找接替储量区提供合理的依据。

Whether in the theoretical research of petroleum geology or in the actual exploration of oil fields, the sealing conditions of traps directly affect the efficiency and enrichment scale of oil and gas accumulation. The gravity flow channels deposited in the Yinggehai Basin are typically segmented and staged. The distribution of gas reservoirs in the channel is complex with different gas-water interfaces between the sand bodies. The selective accumulation of oil and gas is obvious, mainly controlled by the top and lateral sealing capacity of trap, the control of structural fractures to the gas reservoir, and the risk of caprock hydraulic fracture. This project takes the axial channel of Ledong District as the anatomical object, clarifies the top and lateral sealing conditions of lithologic traps, conducts systematic analysis and testing on the capping body, and explore the influence of high temperature thermal fluid on the sealing property of mudstone with limestone and dolomite, analyze the sealing ability of the capping body in different directions. Based on the evolution of regional structures, analyze the law of fractures development, clarify the the development relationship between seismic fuzzy zone and fracture zone, construct the prediction method of fracture development in fuzzy zone and discuss the the game effect of fractures on hydrocarbon migration and preservation. Using inclusions to restore paleofluid pressure, analyze the evolution process of hydrofracture of the trap and its control effect on hydrocarbon accumulation. Finally, a multi-factor quantitative evaluation system for the preservation conditions of high-temperature and high-pressure gravity flow lithologic traps is established to provide a reasonable basis for the oilfield to find replacement reserves.