乌马营奥陶系潜山天然气藏特点及成藏过程  

Natural gas pool in Ordovician reservoir in Wumaying buried-hill and its formation history

作　　者：付立新[1] 陈善勇[2] 王丹丽[2] 刘淑芝[2] 王昕[2] 

机构地区：[1]石油大学 [2]中国石油大港油田

出　　处：《石油勘探与开发》2002年第5期25-27,共3页Petroleum Exploration and Development

摘　　要：乌马营潜山西部乌深 1井在奥陶系顶部钻遇的天然气地球化学特点与黄骅坳陷南区上古生界煤系烃源岩相近 ,证实两者具有亲缘关系 ,并有较明显的多阶混源特征。乌深 1井区天然气注入期为晚第三纪 ,远晚于烃源岩成熟的晚中生代。在分析乌马营潜山古圈闭改造历史的基础上 ,研究了潜山油气的充注、改造过程 ,推测潜山油气曾经历由东向西迁移和凝析油裂解的过程 ,乌深 1井区天然气藏应属于晚中生代形成的古油气藏中的烃类在第三纪晚期再迁移分配的产物 ,现今乌马营潜山可能具有东部为凝析油气、西侧为湿气的油气分布规律。Natural gas in Upper Ordovician system might be related to Upper Paleozoic sources by showing some similar geochemical criterion to coal bearing units in former series. According to component and isotopic ratios of gaseous alkanes, the gas, which was drilled by Well Wushen 1 on the western Wumaying buried hill, might be experienced multi stage charging. The accumulation of gas pool in western Wumaying buried hill was evidently influenced by succeeding tectonic evolution. And natural gas in Ordovician system in Well Wushen 1 was newly gathered through remigration of hydrocarbon which accumulated during latter Mesozoic era, after the former hydrocarbon trap being altered with dramatic faulted block rotation during latter Oligocene. The forming time of which was inferred roughly during latter Tertiary according to fluid inclusion datum in cores of Wushen 1, delayed than critical moment of Paleozoic petroleum system in Wumaying district. Hydrocarbon generating history of Wumaying buried hill was discussed in this paper based on analyzing process of ancient trap reconstruction by using paleostructure restoration technique. According to analyses, hydrocarbon in Ordovician carbonate reservoir in Wumaying buried hill has undergone complicated remigration from northeastern to southwestern buried hill, and hydrocarbon distribution changed from eastern condensate relic to western 'wet gas', owing to limitation of heterosphere of carbonate reservoir.

关 键 词：奥陶系 乌马营潜山 天然气 充注史 古构造恢复 圈闭重组 碳酸盐岩储集层 成藏过程 

分 类 号：P618.130.2[天文地球—矿床学] TE12[天文地球—地质学]