摘要
渐新统下干柴沟组(E3g)是柴达木盆地西部南区主力烃源岩。以其为中心,陆续发现了以尕斯、昆北、英东等大型油气田为代表的一系列新生新储油气聚集单元。利用最新处理解释的二、三维地震资料,钻、测井数据以及地球化学分析和高温高压生烃模拟实验,对该套烃源岩中高丰度层段在三维空间上的分布进行了重新落实,并探索了咸化背景下烃源岩的特点和生烃机制。结果表明该套烃源岩具有高含盐量、高有机质丰度和低成熟度的特点,咸化背景下盐类矿物和放射性矿物的参与,促使烃源岩具有低熟、高效的生烃模式,而这些正是柴西南富油气坳陷油气高丰度富集的主要原因。
Xiaganchaigou Formation acts as the chief source rocks for the southwestern Qaidam Basin.Around it,a series of Cenozoic generation and accumulation reservoirs are discoved.This discovery leads to the question why such young source rocks have so much hydrocarbon supplying ability.Based on the 2D and 3D seismic data,well data,the paper firstly redefines the space distribution of high quality source rocks,and then ascertains the characteristics of source rock and its hydrocarbon generation mechanism.Finally the paper concludes that hydrocarbon source rocks in the study area have the characteristics of high salinity,high abundance of organic matter and low maturity,and the participation of saline minerals and radioactive minerals causes the hydrocarbon source rocks to have low and efficient model of hydrocarbon generation.This is exactly the foundation of hydrocarbon accumulation in southwestern Qaidam Basin.
作者
马新民
王建功
石亚军
黄成刚
李翔
王科
南喜祥
Ma Xinmin;Wang Jiangong;Shi Yajun;Huang Chenggang;Li Xiang;Wang Ke;Nan Xixiang(Northwest Branch,Research Institute of Petroleum Exploration and Development,Petrochina,Lanzhou 730020,China;Research Institute of Petroleum Exploration and Development,Petro China Qinghai Oilfield Company,Dunhuang Gansu 834000,China;Qinghai Division of PetroChina Logging CO.LTD.,Dunhuang Gansu 834000,China)
出处
《地质科技情报》
CSCD
北大核心
2018年第6期96-104,共9页
Geological Science and Technology Information
基金
国家科技重大专项"柴达木复杂构造区油气成藏
关键勘探技术与新领域目标优选"(2016ZX05003-006)
关键词
咸化湖泊生烃
富油气凹陷
柴达木盆地
saline lakes hydrocarbon generation
oil-rich depression
Qaidam Basin
