
第29卷第5期 2015年10月
现代地质 GEOSCIENCE
青海木里三露天天然气水合物气源岩
有机地球化学特征
Vol.29No.5
Oct.2015
唐世琪1.2,卢振权2.3,王伟超*,谭盼盼1.3,李清海,刘文进*,李永红*(1.中国地质大学(北京)地球科学与资源学院,北京100083;2.中国地质调查局油气资源调查中心,北京100029:
3.中国地质科学院矿产资源研究所,北京100037;4.青海煤炭地质一0五勘探队,青海西宁810007)
摘要: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Ⅱ,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。
关键词:天然气水合物;气源岩;有机地球化学特征;三露天;青海木里
中图分类号:TE132.2;P632
文献标志码:A
文章编号:10008527(2015)05121409
Organic GeochemicalCharacteristics of Gas Source Rocks in
theSanlutianMineoftheMuliMiningArea,Qinghai TANG Shi-qi',2, LU Zhen-quan 2,3, WANG Wei-chao' , TAN Pan-pan'3,
LI Qing-hait,LIU Wen-jin', LI Yong-hong
(1. School of Earth Sciences and Resources, China Unisersity of Geosciences, Beijing 100083, Chind; 2. Oil & Gas Surey, China Geological Survey, Beijing100029, Chind; 3. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing100037, Chind
4. Qinghai No. 105 Coal Geological Exploration Team, Xining, Qinghai 810007, China)
Abstract: 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 O. 6% , that is medium, good and very good source rocks. The main organic matter is typed II, and II. 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 O. 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
收稿日期:2015-07-25;改回日期:2015-08-28;责任编辑:楼亚儿。
基金项目:神华青海能源开发有限责任公司"青海省天峻县聚乎更煤矿区三露天天然气水合物调查评价"项目(SHQHNY201307001);
中国地质调查局"祁连山冻土区天然气水合物资源勘查"项目(GZH201400302);中国地质调查局“陆域天然气水合物环境监测及效应研究项目(GZH201400308);中国地质调查局"南祁连盆地油气资源战略调查"项目(1211302108021-3)。
作者简介:唐世琪,女,硕士研究生,1991年出生,石油地质学专业,从事烃源岩、轻烃地球化学研究。
Email: 642191779@qq.com。
通信作者:卢振权,男,研究员,1972年出生,地质学、地球化学专业,从事天然气水合物地质地球化学勘查等研究
Email; luzhq@ vip sina com。