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| Geochemical exploration and resource potential evaluation of biogenic gas in Dongting Lake Basin |
Chun-Yan SUN1( ), Hao ZHAO1,2(), Hui-Ce HE1,3, Jian-Hua LI4, Ming-Guo XIAO5, Shi-Qiang ZHANG1, Dong-Lin WANG1, Yao TANG1 |
1.School of Engineering and Technology,China University of Geosciences(Beijing),Beijing 100083, China
2.No.4 Gold Geological Party of CAPF,Liaoyang 111000,China
3.Guangzhou Marine Geological Survey,Guangzhou 510075,China
4.Hunan Geo-sun High Technology Limited Company,Changsha 410208,China
5.HunanHuasheng Energy Resource and Investment Development Co. Ltd.,Changsha 410004,China |
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Abstract Dongting Lake Basin has the conditions for forming biogenic gas reservoirs of certain scales. For the exploration of biogenic gas resources, the authors carried out a comprehensive exploration work mainly based on geochemical methods during the period of 2013~2016, and conducted fairly systematic surface sediments survey. Geochemical exploration covered an area of 2060 km2, and collected 1498 samples. All the samples were tested by in situ headspace gas (free hydrocarbon), indoor acidolysis hydrocarbon and a small quantity of methane isotope indexes. The results are as follows: 1. The geochemical anomaly of methane in the Dongting Lake basin is composed of free hydrocarbon (headspace gas) and adsorbed hydrocarbon (acid hydrolysis hydrocarbon). The free hydrocarbon is a dynamic reflection of the existing underground biogenic gas, and the hydrocarbon accumulation of the acidolysis hydrocarbon is related to the distribution of the paleo-channel. 2. The Dongting Lake basin is the area of a high background and high anomaly of methane, and the distribution of the abnormal area is basically consistent with the distribution of the Quaternary fault basin, especially in Yuanjiang sag. 3. Acidolysis hydrocarbon anomaly of the Heba Town, bead-like anomaly in NE direction and southeastern secondary local anomalies form a ring anomaly zone surrounding the Yuanjiang sag, which means that the sag may be the potential supply area of biogenic gas in Dongting Lake basin. 4. The area of Qingshuzuie-Heba Town north of Yuanjiang sag is the abnormal high value area of the hydrocarbon methane in Dongting Lake Basin, and this is the direct reflection of natural gas seepage in shallow surface. The high value of acidolysis hydrocarbon methane surrounds the anomaly area of free hydrocarbon methane in Qingshuzui, which constitutes the best combinational hydrocarbon reservoir model. The area of Qingshui-Haba Town is the 'chimney' of the biogenic gas underlying the Dongting Lake Basin and hence the most hopeful breakthrough area for biogas survey in the Dongting Lake Basin.
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Received: 08 May 2017
Published: 20 February 2018
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| 特征 | 生物气类型 | | 细菌成因气与菌解气 | 低成熟气 | | 重烃含量 | <0.5%,典型干气 | | | 干燥系数(C1/C1-C5) | ≥99% | 70%~99% | | 湿度系数(K=C1/(C2+C3)) | ≥1 000 | 100~1 000 | | 甲烷碳同位素δ13Cl | <-55‰ | -60‰~-46‰(腐殖型)
-55‰~-48‰(腐泥型) | | 甲烷氢同位素δD | -250‰~-175‰
陆相环境δD<-190‰
海相环境δD>- 190 ‰ | -271‰~-215‰ | | 有机质成熟度Ro | <0.3% | 0.3%~0.6% |
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| 位置 | 气藏时代 | 深度/m | δ13Cl/‰PDB | 储量/1012 m3 | | 美国 | 阿拉斯加库克湾 | 古近纪、新近纪 | 910~1 650 | -63~-56 | 0.21 | | 墨西哥湾 | 更新世 | 460~2 800 | -69~-55 | 0.34 | | 落基山盆地群 | 白垩纪—古近纪、新近纪 | 120~840 | -72~-55 | | | 伊利诺伊 | 更新世 | 40 | -84~-72 | | | 日本 | 新潟 | 古近纪、新近纪 | 100~1 000 | -75~-65 | 0.13 | | 意大利 | 波河、前亚平宁 | 古近纪、新近纪 | 400~1 830 | -71~-55 | | | 德国 | | 古近纪、新近纪 | 900~1 800 | -72~-64 | | | 加拿大 | 南阿尔伯塔 | 白垩纪 | 300~1 000 | -68~-60 | 5.6 | | 前苏联 | 北威海 | 古近纪、新近纪 | 320~350 | -72~-64 | | | 西伯利亚 | 白垩纪 | 700~1 300 | -68~-58 | | | 斯特拉瓦波尔 | 白垩纪—古近纪、新近纪 | 200~1 200 | -75~-37 | | | 北普里阿拉尔 | 古近纪、新近纪 | 300~500 | -72~-63 | | | 特立尼达 | | 古近纪、新近纪 | 890~3 350 | -71~-64 | | | 波兰 | 喀尔巴阡 | 白垩纪—古近纪、新近纪 | | | |
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| 时期 | 洞庭盆地 | 安乡凹陷 | 沅江凹陷 | 安乡县城
顶空气安乡异常带
酸解烃安乡异常带
酸解烃三仙湖异常带 | 酉港镇以西 | 南县县城
顶空气青树嘴
异常带,酸解烃
河坝镇异常带 | 草尾镇—杨罗洲—
南大膳,顶空气
草尾镇—茶盘洲—
四季红异常带 | 茈湖口—白马寺 | | 地球化学异常显示分布 | 酸解烃强
顶空气强 | 无 | 酸解烃强
顶空气强 | 顶空气强
酸解烃弱 | 无 | | 沉积期 | Q2早期
(洞庭湖组) | 断陷至第四纪最大
规模,整体接收沉积 | 50~80 m | 50~100 m | 70~80 m | 40~100 m | 70~80 m | Q1晚期
(汨罗组) | 盆地统一断陷,局部
沉降强度不同 | 20~60 m | 20~80 m,
北厚南薄 | 20~60 m,
西厚南薄 | 20~100 m,
西薄东厚 | 20~60 m,
南薄北厚 | Q1早期
(华田组) | 盆地局部发生断陷,
沉积范围扩大 | 50~140 m | 10~50 m,
中间薄边缘厚 | 50~140 m | 30~60 m
厚度较均匀 | 10~50 m | | E3—N | 隆起剥蚀,沉积间断 | | 沉积期 | E2
(新河口组) | 持续接受沉积,
沉积中心转移
至沅江凹陷 | 沉积 | 沉积 | 沉积 | 阳罗-河心洲以东
最厚400 m | 没有沉积 | | E2
(汉寿组) | 沉积 | 沉积 | 沉积 | 冯家湾一带
厚达1 000 m | 南塘-马劲山达
1 000 m | E2
(沅江组) | 沉积 | 沉积 | 沉积 | 黄土包-河心洲-冯家湾
湘深17井厚474 m | 南塘一带,湘深
27井535.5 m | E1
(桃源组) | 沉积 | 沉积 | 沉积 | 湘深30井445 m
5井390 m | 湘深27井153 m,
32井311.5 m | | K2 | 整体断陷,接受沉积,
沉积中心位于
安乡凹陷 | 沉积中心,沉积厚度最大 | 沉积 | 沉积 | 沉积 | | 钻井资料 | | ZK148(Q1-Q2)
ZK149(Q1缺失
华田组) | ZK138 | ZK151、ZK153、ZK155、
ZK157Z、K158、ZK160、
ZK161、ZK165(Q1-Q2) | |
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