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引用本文:杨玉茹,孟凡洋,白名岗,张家政,夏响华,包书景,胡志方,张聪,王玉芳,宋腾,王向华,于伟欣. 世界最古老页岩气层储层特征与勘探前景分析[J]. 中国地质, 2020, 47(1): 14-28.
YANG Yuru,MENG Fanyang,BAI Minggang,ZHANG Jiazheng,XIA Xianghua,BAO Shujing,HU Zhifang,ZHANG Cong,WANG Yufang,SONG Teng,WANG Xianghua,YU Weixin. An analysis of reservoir characteristics, resources and exploration prospects of the oldest shale gas in the world[J]. Geology in China, 2020, 47(1): 14-28(in Chinese with English abstract).
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世界最古老页岩气层储层特征与勘探前景分析
杨玉茹1,2, 孟凡洋1, 白名岗1,2, 张家政1, 夏响华1,2, 包书景1,2, 胡志方1,2, 张聪1,2, 王玉芳1, 宋腾1, 王向华2,3, 于伟欣2,3
1.中国地质调查局油气资源调查中心, 北京 100083;2.中国地质调查局非常规油气地质重点实验室, 北京 100029;3.中国地质大学能源学院, 北京 100083
摘要:
在中国南方海相主要页岩层系中,除已经成为页岩气工业产层的奥陶系五峰组—志留系龙马溪组页岩层系外,还包括寒武系牛蹄塘组及震旦系陡山沱组等海相页岩。目前,震旦系陡山沱组是中国乃至世界上发现的最古老页岩气层。本文在参考前人区域地质研究基础上,依托位于中扬子地区的鄂阳页1井钻井岩心资料,利用多尺度的储层性质表征方法,结合有机质丰度与演化特征开展综合研究,对陡山沱组古老页岩气层进行了储层及生烃潜力分析,并与美国及中国四川盆地已形成商业开发的页岩气产层进行了对比。研究认为,鄂阳页1井区震旦系陡山沱组页岩发育于相对稳定的沉积环境,泥页岩厚度大,有机质含量较高,大部分样品总有机碳(TOC)含量大于2%,且有机质显微形态以填隙状优质生气有机质为主;页岩脆性矿物含量高,微纳米孔隙及多尺度裂隙发育;与四川盆地龙马溪组页岩相比,陡山沱组页岩有机质热演化程度适中,计算拉曼成熟度介于2.0~3.0,有机质处于热解生气阶段。分析认为鄂西陡山沱组具备形成页岩气藏的基本地质条件,具有良好的资源与勘探前景。研究成果对于未来页岩气新领域、新层系的评价及勘探开发,提供了较全面的基础资料。
关键词:  古老页岩气层  震旦系陡山沱组  新元古代  储层特征  勘探前景分析  油气调查工程  中国南方
DOI:10.12029/gc20200102
分类号:TE122
基金项目:中国地质调查局地质调查项目“武陵山下古生界页岩气战略选区调查”(DD20160195)及“十三五”国家科技重大专项项目(2016ZX05034003-007)联合资助。
An analysis of reservoir characteristics, resources and exploration prospects of the oldest shale gas in the world
YANG Yuru1,2, MENG Fanyang1, BAI Minggang1,2, ZHANG Jiazheng1, XIA Xianghua1,2, BAO Shujing1,2, HU Zhifang1,2, ZHANG Cong1,2, WANG Yufang1, SONG Teng1, WANG Xianghua2,3, YU Weixin2,3
1.Oil & Gas Survey, China Geological Survey, Beijing, 100083, China;2.Unconventional Petroleum Geology Laboratory of China Geological Survey, Beijing 100029, China;3.School of Energy, China University of Geosciences(Beijing), Beijing 100083, China
Abstract:
Main marine shale formations in southern China, in addition to the Ordovician Wufeng Formation and the Silurian Longmaxi Formation which have become China's shale gas industrial production layers, include marine shale of the Cambrian Niutitang Formation and the Sinian Doushantuo Formation, and other marine shales. So far, the Sinian Doushantuo Formation is the oldest shale gas layer found in China and even in the whole world. Based on previous studies of regional geology and relying on drilling core data obtained in the middle Yangtze region, the authors used multi-scale methods for characterizing the reservoir properties and, combined with the organic matter abundance and evolution characteristics, carried out the comprehensive research. The reservoir and hydrocarbon potential of the world's oldest shale gas were analyzed for the first time. A comparison was made with the commercial shale gas reservoir in the United States and that in Sichuan basin of China. The results show that the Sinian Doushantuo Formation shale in the middle Yangtze area is developed in a relatively stable sedimentary environment, and the mud shale has large thickness and high organic matter content. The total organic carbon (TOC) content of most samples is more than 2%. The brittle mineral content of shale is high, and micro-nano pores and multi-scale fractures are developed. Compared with shale of Longmaxi Formation in Sichuan basin, the thermal evolution degree of organic matter in shale of Doushantuo Formation is moderate, the Raman maturity is between 2.0 and 3.0, the organic matter is in the stage of pyrolysis. The analysis indicates that Doushantuo Formation has the basic geological conditions for shale gas reservoirs and has a good resource and exploration prospect. The research results provide comprehensive basic data for the evaluation, exploration and development of new shale gas fields and new strata in the future.
Key words:  the oldest shale gas formation  Sinian Doushantuo Formation  Neoproterozic  reservoir characteristics  resource and exploration prospect analysis  oil and gas survey engineering  South China