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基于PVTX模型对库车坳陷古压力恢复与压力演化分析

Paleo Pressure Recovery and Pressure Evolution in Kuqa Depression
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摘要 据超压盆地古压力恢复和重建研究油气富集规律,对库车坳陷不同区带9口井共20个流体包裹体样品均一温度、冰点温度、激光拉曼光谱等进行系统测试。由于5 Ma以来的快速烃类充注过程,导致油包裹体捕获较少,以单一气相包裹体及含烃流体包裹体为主。应用流体包裹体PVTX法对库车坳陷25 Ma关键油气充注期的古压力进行定量化恢复。原油包裹体主要捕获于4~5 Ma,白垩系主力储层为弱超压背景,压力系数为1.23。当储层埋深最大时,含烃流体包裹体恢复的古压力系数明显低于构造抬升期,表明构造抬升期为天然气的主充注期,亦是超压的主要发育期。因此,库车坳陷的超压成因,除早期欠压实作用外,晚期构造挤压作用亦非常重要。 In recent years,the study of paleo-pressure in sedimentary basins has become a key area in basin analysis and reservoir accumulation dynamics research,and its role in oil and gas resource exploration and prospect prediction has become increasingly prominent.The Kuqa Depression is a typical ultra-high pressure oil and gas area in western China.Overpressure has a significant controlling effect on hydrocarbon accumulation.Based on the systematic tests of homogenization temperature,freezing point temperature and laser Raman spectrum of 20 fluid inclusion samples from 9 wells in different zones of Kuqa depression,PVTx method of fluid inclusion and laser Raman displacement measurement method were used to recover the Paleopressure of key oil and gas filling period since 25Ma in Kuqa depression,and the evolution process of paleo-pressure in the Kuqa depression has been established,which is of great significance for the study of oil and gas accumulation in overpressured basins.
作者 吴楠 蔡忠贤 王健 Wu Nan;Cai Zhongxian;Wang Jian(College of Geosciences,Yangtze University,Wuhan,Hubei,430100,China;School of earth resources,China University of Geosciences(Wuhan),Wuhan,Hubei,430074,china)
出处 《新疆地质》 CAS CSCD 北大核心 2020年第4期508-511,共4页 Xinjiang Geology
基金 国家自然科学基金项目库车坳陷超深层多幕压力调整所导致的相分馏演化(41772145)资助。
关键词 库车坳陷 超压演化 古压力恢复 Kuqa depression Overpressure evolution Paleo-pressure recovery
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