摘要
为了搞清青藏高原多年冻土区黑海盆地天然气水合物成藏条件及其资源前景,通过实地勘查、样品采集及测试和资料二次开发等方式,开展了物源探究、地温统计、水源追索、冻土和储集运移条件的调查等工作.研究结果表明:1)物源充足,希里可特组烃源岩具有较高的有机质丰度和成熟度,Ⅲ型有机质类型是主要物源,八宝山组烃源岩提供次要物源;2)地温适宜,平均温度为一5～1℃;3)地下水水源较充足,补给源主要是大气水和冰雪融水;4)冻土发育,冻土厚度为10～250 m;5)储集运移条件良好,希里可特组、八宝山组和第四系中的砂岩层,各岩层中发育的裂缝、孔隙以及次级高角度断裂是天然气水合物储集、运移的空间和通道;6)天然气水合物成藏前景较好,在黑海盆地优选出成藏远景区1处.以上成果认识,对整个东昆仑乃至青藏高原地区天然气水合物远景区预测具有指导意义.
Abstract
In order to clarify the conditions and resource prospects of natural gas hydrate accumulation in the permafrost area of Heihai Sea Basin in Qinghai-Tibet Plateau,the author conducted the matter source exploration,ground temperature statistics,water source tracing,and investigation of frozen soil and storage and transportation conditions through field exploration,sample collection and testing,and data secondary development,The results indicated as follow:1)The sources are abundant,and the source rocks of Xilikete Formation are the main sources due to their high organic matter abundance,maturity,and type Ⅲ organic matter,while the source rocks of the Babaoshan Formation provide secondary sources;2)The ground temperature is suitable,with an average temperature of-5～1 ℃;3)The ground water source is relatively sufficient,and the main sources of supply are the atmospheric water and the deliquation water of ice and snow;4)The frozen soil is developed,with a thicknesses ranging from 10 to 250 m;5)The storage and migration conditions are good,and the sandstone layers in Xilikete Formation,Babaoshan Formation,and Quaternary System,as well as the fractures,pores,and secondary high angle faults developed in each layer,are the spaces and channels for the storage and migration of natural gas hydrates;6)The natural gas hydrate has a good prospect for accumulation,and one prospective reservoir area has been selected in Heihai Sea Basin.The above achievements have guiding significance for the prediction of natural gas hydrate prospects in the entire East Kunlun and even Qinghai-Tibet Plateau region.
基金项目
青海省地质矿产勘查开发局地质勘查项目(青地矿科[2020]61号)
维普
万方数据