辽河坳陷页岩油和页岩气聚集条件及富集机理

Shale oil and shale gas are hydrocarbon accumulations that mainly store in shale strata.Its exsitence and discovery greatly enlarge the hydrocarbon exploration areas. Shahejie Formation dark shale with abundant organic materials was widely developed in Liaohe Depression, which was considered as one of most favourable shale oil and shale gas accumulations, having great scientific significance. Based on the geological conditions and formation analysis of shale hydracarbon generation, continental shale oil&gas acccumulations geological conditions are researched with adaption of exprimental test, integration logging with productive materials and analogy. Analyzing test data of shale gas and shale oil content,we investigate the hydrocarbon content changing characteristic and its main influence factors. establishing geological model of shale oil, shale gas and relationship between them. Liaohe Depression shale oil and shale gas enriching geological model are also established combining with geological conditions, which predicts the distribution characteristic of shale oil and shale gas. What's more, China continental shale oil and shale gas accumulation conditions and its enriching mechanism are discussed. The research achievements will provide as reference for other similar areas of shale oil and shale gas exploration, and will also provide basic supports for geological theory and related technologies development of continental shale oil and shale gas.

页岩油和页岩气是赋存于泥页岩层系中的石油或天然气，它们的存在和发现极大地拓展了油气勘探开发领域。辽河坳陷新生界沙河街组湖相暗色泥页岩发育且有机质条件好，是我国陆相页岩油和页岩气勘探的最有利区域之一，具有重要研究意义。项目基于页岩生油、生气地质条件和页岩油、页岩气形成条件分析，采取实验、测井及生产资料结合以及类比手段，探讨陆相页岩油和页岩气发育地质条件。结合含气量及含油率测试数据分析，探讨页岩含油率和含气量变化特点及其主要影响因素，建立页岩油、页岩气及相互关系地质模型。结合研究区地质条件分析，建立辽河坳陷页岩油、页岩气富集地质模型，并预测研究区页岩油和页岩气分布特征。进一步，探讨中国陆相页岩油和页岩气的聚集条件及富集机理。研究成果将为其它相似地区的页岩油和页岩气勘探研究提供参考，为中国陆相页岩油和页岩气地质理论及相关技术的发展提供基础支撑。

辽河坳陷（包括西部凹陷、东部凹陷和大民屯凹陷等）古近系沙河街暗色泥页岩地层的分布比较广泛，沉积相为深湖～半深湖相，泥页岩厚度大且有机质条件好，页岩油和页岩气富集地质条件优越，已分别在西部凹陷的曙古165井、大民屯凹陷的沈224井以及东部凹陷的于102井沙河街组三段和四段泥页岩地层中获得了工业油气流，证实页岩油和页岩气具有良好的勘探前景，是中国最好的页岩油和页岩气发育有利区域之一。项目以辽河坳陷古近系沙河街组页岩层系为主要对象，通过研究陆相页岩生油和生气地质条件，综合分析了页岩的含油和含气特点及其相互关系，剖析了页岩油和页岩气的聚集条件及富集机理。通过探索研究，在陆相页岩广泛发育，有机质丰度高、有机质类型多样和有机质热演化程度跨度大的辽河地区确定了页岩油和页岩气有效聚集的地质条件，模拟了不同地质条件下页岩生油和生气过程、分析了页岩含油量和含气量及其变化特点，摸清了不同因素对页岩含油和含气性的影响作用，厘定了页岩油和页岩气富集评价关键参数，建立并完善了陆相页岩油和页岩气富集地质理论。项目研究所取得的成果，为相关地区的页岩油气勘探提供了指导、借鉴和参考。