CAJ | 학술논문

通过采集青海木里三露天天然气水合物钻孔岩心样品，对该区天然气水合物赋存层段的中侏罗统和上三叠统烃（气）源岩的有机地球化学特征进行了分析。结果显示：研究区中侏罗统和上三叠统烃（气）源岩有机质丰度较高，TOC含量多在0.6％以上，即整体上为中等、好、很好烃源岩；有机质类型两套地层均主要以Ⅱ2型、Ⅲ型为主；两套地层样品镜质体反射率多数介于0.7％～1.3％之间，只有少部分样品镜质体反射率低于0.7％，故有机质演化整体处于成熟阶段，或处于凝析油阶段，还没有达到湿气和干气阶段，可能只为该区天然气水合物提供一定量的气源条件，其主力气源岩可能来自更深部层系；研究区上三叠统烃（气）源岩有机质成熟度整体不高甚至低于中侏罗统，可能受断层逆推作用而出露地表的影响。
통과채집청해목리삼로천천연기수합물찬공암심양품，대해구천연기수합물부존층단적중주라통화상삼첩통경（기）원암적유궤지구화학특정진행료분석。결과현시：연구구중주라통화상삼첩통경（기）원암유궤질봉도교고，TOC함량다재0.6％이상，즉정체상위중등、호、흔호경원암；유궤질류형량투지층균주요이Ⅱ2형、Ⅲ형위주；량투지층양품경질체반사솔다수개우0.7％～1.3％지간，지유소부분양품경질체반사솔저우0.7％，고유궤질연화정체처우성숙계단，혹처우응석유계단，환몰유체도습기화간기계단，가능지위해구천연기수합물제공일정량적기원조건，기주력기원암가능래자경심부층계；연구구상삼첩통경（기）원암유궤질성숙도정체불고심지저우중주라통，가능수단층역추작용이출로지표적영향。
The organic geochemical indicators were analyzed emphatically on the hydrocarbon (gas)source rocks of the Middle Jurassic and the Upper Triassic in gas hydrate occurrence interval in Sanlutian area of Muli, Qinghai.Results showed that the organic matter contents are at high levels in hydrocarbon (gas)source rocks of the Middle Jurassic and the Upper Triassic in the study area.Most TOC contents are more than 0.6%,that is medium,good and very good source rocks.The main organic matter is typed II2 and Ⅲ.The vitrinite reflec-tance of most samples are between 0.7% to 1.3% and only a small part of the vitrinite reflectances are less than 0.7%.So the organic matter in most samples are at mature levels,or at condensate levels,not reach the level of wet to dry gas.This kind of gas source rocks may not produce large amounts of hydrocarbon gases to meet the prerequisite formation conditions for gas hydrate in the study area.The maturity of organic matter in the Upper Triassic is not high,even lower than that in the Middle Jurassic in the study area,which is probably caused by ground or shallow occurrence of the Upper Triassic reversed by faults.