摘要
西山—金鸿山地区赋存较厚的侏罗系泥页岩层,厚度40～280 m,部分区域暗色泥页岩有效厚度达到100～200 m。为了解该泥页岩的有机地化特征,通过观察分析地表侏罗系泥页岩层,系统的采集样品,对采集的泥页岩样品进行室内测试分析,并对研究区泥页岩的总有机碳(TOC)、镜质组分射率(Ro)、干酪根显微组分、干酪根元素、干酪根同位素测试成果数据进行综合分析。结果表明:该区茫崖煤矿以及黑石山地区TOC含量相对较低(1. 0%～3. 0%),中部地区TOC含量较高(超过2. 0%～3. 0%),泥页岩为好的烃源岩;采用氢碳原子比、干酪根类型指数及干酪根碳同位素指标确定该区的泥页岩干酪根类型为Ⅱ2型;泥页岩镜质组反射率(Ro)较高(1. 3%～2. 2%),基本达到成熟阶段及以上,生烃潜力较大。该区泥页岩的有机地化特征各项目测试值满足陆相页岩气有利区优选的标准,由此优选出以西山煤矿北—柴水沟—小西沟—月牙山一线为南界,阿尔金山前断裂带为北界的页岩气有利区。
The Xishan- Jin Hongshan area is rich in Jurassic shale with thickness of 40~280 m, and the effective thickness of dark shale in some areas reaches 100~200 m.Through the observation and analysis of Jurassic shale in the research area, shale samples were systematically collected and analyzed. The total organic carbon（TOC）, vitrinite reflectance （R o）, kerogenmacerals, kerogen elements, kerogen isotope test results of comprehensive analysis of data show that the TOC in Heishishan and Mang-ai Coal Mine is relatively low （1.0%~3.0%）, but it is high （2.0%~3.0%） in central region. The dark shale is good hydrocarbon source rocks. The atomic ratio of hydrogen to carbon, kerogen type index and kerogen carbon isotope indicate the shale kerogen type is Ⅱ 2 type in the area. Shale vitrinite reflectance （R o） values are high enough（1.3%~2.2%） to reach the mature stage.The shale hydrocarbon potential is still large. The test values of each project of the geochemical characteristics of mud shale in the area meet the criteria for the optimization of the favorable zone of terrestrial shale gas. Xishan Coal Mine-Chaishuigou-Xiaoxigou-Yueya Mountain is the south boundary of the optimized shale gas favorable zone. The front of Aerjin faults zone is the northern boundary.
作者
刘达成
祝铠甲
保玉莲
刘腾
陈磊
LIU Dacheng;ZHU Kaijia;BAO Yulian;LIU Teng;Chen Lei(Qinghai Coal Geological Exploration Institute,Xining 810000,China)
出处
《青海大学学报（自然科学版）》
2018年第5期89-96,共8页
Journal of Qinghai University(Natural Science)
基金
青海省地质勘查基金项目(2017042109kc059)
