渤海湾盆地辽河坳陷天然气地质条件、资源潜力及勘探方向
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摘要
辽河坳陷已进入高勘探程度阶段,近年来几乎没有上报天然气探明储量。辽河坳陷还有多少剩余常规天然气资源?是否具备致密气、页岩气形成条件,其资源前景如何?这是勘探家十分关心的科学问题。以往的资源评价成果不能给出令人信服的结论。从天然气成藏静态要素—气源岩条件、储集条件和盖层条件入手,阐述了辽河坳陷具备形成致密气、页岩气的地质条件,应用稳定碳同位素等技术手段进行气源分析,揭示了天然气成藏主控因素,建立了辽河坳陷常规及致密气、页岩气成藏模式。在此基础上开展了新一轮天然气资源评价。评价结果认为辽河坳陷不仅还有2 000×10~8 m~3剩余常规天然气资源,还有约5 000×10~8 m~3非常规天然气资源有待发现。指出了榆树台—盖州滩、兴隆台、大平房—葵花岛构造带是常规天然气勘探有利区带,深层潜山、火山岩是主要勘探目标,西部凹陷南段洼陷带及东部凸起是致密气、页岩气勘探有利区。
Exploration for Liaohe Depression has entered a high stage and nearly no proved reserves have beenreported in recent years.The scientific issues that how many remaining conventional natural gas resources are there in the Liaohe Depression,whether there are conditions for tight and shale gas and the future of its resources,have always been closely related to exploration workers.Previous resource evaluations failed to give convincing conclusions.The geological conditions for the tight gas and shale gas is described starting from the static elements including gas source rock conditions,reservoir conditions and cap rock conditions in the paper.Gas source analysis is made by using the stable carbon isotope method and the controlling factors for gas reservoir formation are disclosed,so the conventional and unconventional gas reservoir formation patterns are built for the Liaohe Depression.On the basis of this,a new round of natural gas evaluation has been carried out and the results show that there will be not only 200 billion cubic metres conventional natural gas resources,but also about 500 billion cubic metres unconventional natural gas to be discovered in Liaohe Depression.It is pointed out that the structure belts of Yushutai-Gaizhoutan,Xinglongtai,Dapingfang-Kuihuangdaoare favorable areasfor conventional gas exploration,and the southern sag and eastern uplift are favorable areas for tight and shale exploration.
Exploration for Liaohe Depression has entered a high stage and nearly no proved reserves have beenreported in recent years.The scientific issues that how many remaining conventional natural gas resources are there in the Liaohe Depression,whether there are conditions for tight and shale gas and the future of its resources,have always been closely related to exploration workers.Previous resource evaluations failed to give convincing conclusions.The geological conditions for the tight gas and shale gas is described starting from the static elements including gas source rock conditions,reservoir conditions and cap rock conditions in the paper.Gas source analysis is made by using the stable carbon isotope method and the controlling factors for gas reservoir formation are disclosed,so the conventional and unconventional gas reservoir formation patterns are built for the Liaohe Depression.On the basis of this,a new round of natural gas evaluation has been carried out and the results show that there will be not only 200 billion cubic metres conventional natural gas resources,but also about 500 billion cubic metres unconventional natural gas to be discovered in Liaohe Depression.It is pointed out that the structure belts of Yushutai-Gaizhoutan,Xinglongtai,Dapingfang-Kuihuangdaoare favorable areasfor conventional gas exploration,and the southern sag and eastern uplift are favorable areas for tight and shale exploration.
引文
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[12]Wang Xuejun.Application of sequence method of reservoir scale in resource forecast in Kendong area[J].Petroleum Geology and Recovery Efficiency,2007,14(2):7-9.王学军.油藏规模序列法在垦东地区资源预测中的应用[J].油气地质与采收率,2007,14(2):7-9.
[13]Zhao Zhengzhang,Du Jinhu,et al.Tight Oil&Gas[M].Beijing:Petroleum Industry Press,2012.赵政璋,杜金虎,等.致密油气[M].北京:石油工业出版社,2012.
[2]Li Zongliang.A primary study on distribution pattern of source-contacting gas accumulation for the third section of Shahejie Formation in the easten sag of Liaohe Depression[J].Natural Gas Geoscience,2011,22(1):23-28.李宗亮.辽河坳陷东部凹陷沙三段根缘气分布规律浅析[J].天然气地球科学,2011,22(1):23-28.
[3]Li Yi,Fang Shi,Sun Pingchang.Geological conditions of shale gas accumulation of Paleogene Shahejie Formation in the western sag of Liaohe Basin[J].Geology and Resources.2017,26(2):140-146.李毅,方石,孙平昌,等.辽河盆地西部凹陷沙河街组古近系页岩气成藏地质条件研究[J].地质与资源.2017,26(2):140-146.
[4]Mao Junli,Li Xiaoguang,Shan Yansheng,et al.Shale gas accumulation conditions of eastern region of Liaohe Depression[J].Earth Science Frontiers,2012,19(5):348-355.毛俊莉,李晓光,单衍胜,等.辽河东部地区页岩气成藏地质条件[J].地学前缘,2012,19(5):348-355.
[5]Zhang Zhanwen,Gao Qingsheng,Wu Tiesheng.Geochemistry character and genetic division of natural gas in Eastern Sag,Liaohe Basin[J].Natural Gas Geoscience,1995,27(6):1-8.张占文,高庆胜,吴铁生.辽河盆地东部凹陷天然气的地球化学特征及成因分类[J].天然气地球科学.1995,27(6):1-8.
[6]Xie Wenyan,Meng Weigong,Li Xiaoguang,et al.Bedrock Oil and Gas Reservoir in Liaohe Depression[M].Beijing:Petroleum Industry Press,2012.谢文彦,孟卫工,李晓光,等.辽河坳陷基岩油气藏[M].北京:石油工业出版社,2012.
[7]Meng Weigong,Sun Hongbin.Paleogene Clastic Rock Reservoir in Liaohe Depression[M].Beijing:Petroleum Industry Press,2009.孟卫工,孙洪斌.辽河坳陷古近系碎屑岩储层[M].北京:石油工业出版社,2009.
[8]Li Chunhua,Yu Peng,Mao Junli,et al.Diagenetic characteristics of tight sandstone of Upper Paleozoic of east uplift in Liaohe Depression[J].Special Oil&Gas Reservoirs,2013,20(1):19-22.李春华,于鹏,毛俊莉,等.辽河坳陷东部凸起上古生界致密砂岩气成藏特征[J].特种油气藏,2013,20(1):19-22.
[9]Yang Xin,Zheng Jianjing,Wang Xiaofeng,et al.Origin of nature gas and gas filling pattern in West Sag,Liaohe Depression[J].Natural Gas Geoscience,2011,22(6):1015-1020.杨鑫,郑建京,王晓锋,等.辽河坳陷西部凹陷天然气成因类型与成藏模式[J].天然气地球科学,2011,22(6):1015-1020.
[10]Li Xiaoguang,Liu Baohong,Cai Guogang.Genetic analysis of interior reservoirs in metamorphic buried hill of Liaohe Depression[J].Special Oil and Gas reservoirs,2009,16(4):1-12.李晓光,刘宝鸿,蔡国钢.辽河坳陷变质岩潜山内幕油藏成因分析[J].特种油气藏,2009,16(4):1-12.
[11]Jin Zhijun,Zhang Jinchuan.Evalution Technology of Oil and Gas Resources[M].Beijing:Petroleum Industry Press,1999.金之钧,张金川.油气资源评价技术[M].北京:石油工业出版社,1999.
[12]Wang Xuejun.Application of sequence method of reservoir scale in resource forecast in Kendong area[J].Petroleum Geology and Recovery Efficiency,2007,14(2):7-9.王学军.油藏规模序列法在垦东地区资源预测中的应用[J].油气地质与采收率,2007,14(2):7-9.
[13]Zhao Zhengzhang,Du Jinhu,et al.Tight Oil&Gas[M].Beijing:Petroleum Industry Press,2012.赵政璋,杜金虎,等.致密油气[M].北京:石油工业出版社,2012.