CAJ | 학술논문

对青海聚乎更钻探区含天然气水合物岩心气体组成特征进行研究，有助于弄清钻探区天然气水合物的气体成因及来源，对于区内天然气水合物的勘探开发具有重要的指导意义。对 DK8-19、DK10-17、DK11-14、DK12-13和 DK13-11等5个钻孔获得的18个含水合物岩心样品，开展了气体组成和同位素特征及 Cl ／（C2＋C3）－δ13 CC1、δDC1－δ13 CC1和δ13 CC2－δ13 CC1等关系图解的综合研究。结果显示：青海聚乎更钻探区含水合物岩心气体以轻烃为主，具湿气特征，其同位素表现为正碳同位素系列特征。除 DK8-19孔浅层岩心烃类气体可能含有少量生物成因气外，钻探区其余各孔所有样品的气源组成均以热解成因气为主，为典型的有机成因烃类气体，且来源于淡水环境下形成的天然气。
대청해취호경찬탐구함천연기수합물암심기체조성특정진행연구，유조우롱청찬탐구천연기수합물적기체성인급래원，대우구내천연기수합물적감탐개발구유중요적지도의의。대 DK8-19、DK10-17、DK11-14、DK12-13화 DK13-11등5개찬공획득적18개함수합물암심양품，개전료기체조성화동위소특정급 Cl ／（C2＋C3）－δ13 CC1、δDC1－δ13 CC1화δ13 CC2－δ13 CC1등관계도해적종합연구。결과현시：청해취호경찬탐구함수합물암심기체이경경위주，구습기특정，기동위소표현위정탄동위소계렬특정。제 DK8-19공천층암심경류기체가능함유소량생물성인기외，찬탐구기여각공소유양품적기원조성균이열해성인기위주，위전형적유궤성인경류기체，차래원우담수배경하형성적천연기。
Studying the composition characteristics of gases dissociated from hydrate-bearing cores in Juhugeng drilling area in Qinghai can be helpful for finding out the gases genesis and origin of natural gas hydrates,and can provide scientific guidance for gas hydrates exploration and exploitation.The gas molecular and stable iso-topic compositions are analyzed for the totally 18 hydrate-bearing cores from 5 drilling holes (DK8-19,DK10-17,DK11-14,DK12-13 and DK13-11).The relevant diagrams of Cl /(C2 +C3 )-δ13 CC 1 ,δDC1 -δ13 CC1 andδ13 CC 2-δ13 CC 1 are investigated in this paper.The results show that gases dissociated from hydrate-bearing cores mainly composed of light hydrocarbons with features of wet gas in Juhugeng drilling area in Qinghai and the iso-topes are characterized as normal carbon isotopic series.In the drilling area,gases from most hydrate-bearing cores are mainly thermogenetic gas origin,and typical organic genetic gases formed in freshwater environment.However,it contains probably a small amount of biogenic gases in the shallow cores of DK8-19 hole.