柴达木盆地西部油泉子油田超压形成机制  

Mechanism of Overpressure Formation in the Youquanzi Oilfield in western Qaidam Basin

作　　者：韩天华 刘成林[1,2] 田继先[3] 杨韬政 冯德浩 李国雄 Han Tianhua;Liu Chenglin;Tian Jixian;Yang Taozheng;Feng Dehao;Li Guoxiong(National Key Laboratory of Petroleum Resources and Engineering of China University of Petroleum(Beijing),Beijing 102249,China;China University of Petroleum(Beijing),Beijing 102249,China;China Petroleum Exploration and Production Research Institute,Beijing 100083,China)

机构地区：[1]中国石油大学(北京)油气资源与工程全国重点实验室,北京102249 [2]中国石油大学(北京),北京102249 [3]中国石油勘探开发研究院,北京100083

出　　处：《特种油气藏》2024年第2期37-46,共10页Special Oil & Gas Reservoirs

基　　金：国家自然科学基金“咸化湖盆条件下盐类对地层超压的作用机制研究”(41872127)。

摘　　要：柴达木盆地西部油泉子油田新生界地层超压广泛发育,超压成因的判别对于油气运移、成藏等方面的研究具有重要意义。通过对油泉子油田的实测压力、测井曲线、声波速度-密度交会图、超压成因综合分析法和超压封存箱模式的综合分析,对研究区超压形成机制进行研究。结果表明:油泉子油田新生界地层纵向上发育负压、常压、超压和强超压系统,超压系统压力系数普遍大于1.3。部分超压点压力系数大于1.73,表现为强超压的特点;该区超压主控因素为不均衡压实、构造挤压作用和生烃作用,油气运移符合超压封存箱模式,由于超压的作用导致油气向南翼山地区运移。该研究成果明确了油泉子油田油气的运移方向,对柴西地区及相似区域油气的成藏研究工作具有指导意义。Overpressure is widely developed in the Cenozoic formation of the Youquanzi Oilfield in western Qaidam Basin,and the identification of overpressure genesis has great significance for the study of oil-gas migration and reservoir formation.The measured pressures,logging curves,acoustic velocity-density cross plot,overpressure genesis comprehensive analysis method and overpressure compartment mode for the Youquanzi Oilfield were comprehensively analyzed.The results show that the negative pressure,normal pressure,overpressure and strong overpressure systems were longitudinally developed in the Cenozoic Formation of the Youquanzi Oilfield;the pressure coefficient of the overpressure system was generally greater than 1.3,and the pressure coefficient of some overpressure points was greater than 1.73,showing the characteristics of strong overpressure;overpressure in this area,the main controlling factors were the uneven compaction,tectonic extrusion and hydrocarbon generation;the oil-gas migration was in line with the overpressure compartment mode;the oil and gas were migrated to the Nanyi Mountain Area due to overpressure.The study result clarifies the oil-gas migration direction of the Yauquanzi Oilfield and is of guiding significance to the study of oil and gas reservoirs in western Qaidam Basin and similar regions.

关 键 词：超压封存箱 压力系数 不均衡压实 生烃作用 构造挤压 油泉子油田 

分 类 号：TE121.2[石油与天然气工程—油气勘探]