四川盆地涪陵地区茅一段酸解气、吸附气特征及气源对比

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英文篇名：A characteristic analysis between acidolysis gas and absorbed gas and its application to gas–source correlation in Mao 1 Member, Fuling area, Sichuan Basin 作者：姚威 ; 许锦 ; 夏文谦 ; 王强 ; 饶丹 ; 陈强路 英文作者：Yao Wei;Xu Jin;Xia Wenqian;Wang Qiang;Rao Dan;Chen Qianglu;Wuxi Research Institute of Petroleum Geology,Sinopec Exploration & Production Research Institute;Sinopec Exploration Company; 关键词：酸解气 ; 吸附气 ; 气源对比 ; 组分 ; 碳同位素 ; 四川盆地 ; 涪陵地区 ; 中二叠世 ; 茅一段气藏 ; 自生自储 英文关键词：Acidolysis gas;;adsorbed gas;;Gas–source correlation;;Component;;Carbon isotope;;Sichuan Basin;;Fuling area;;Middle Permian;;Gas pool in Mao 1 member;;Self-generation and self-storage 中文刊名：TRQG 英文刊名：Natural Gas Industry 机构：中国石化石油勘探开发研究院无锡石油地质研究所;中国石化勘探分公司; 出版日期：2019-06-25 出版单位：天然气工业 年：2019 期：v.39;No.308 基金：国家科技重大专项“海相烃源层系生排烃机理与评价技术”(编号:2017ZX05005-001-003);; 中国石化勘探分公司科技项目“涪陵地区茅一段生烃潜力评价”(编号:35450003-17-ZC0607-0032) 语种：中文; 页：TRQG201906008 页数：6 CN：06 ISSN：51-1179/TE 分类号：51-56

摘要

烃源岩中酸解气脱附的是不连通孔隙和碳酸盐矿物晶格中吸附的烃气,吸附气脱附的主要是连通孔隙和表面吸附的烃气。对于究竟是用酸解气还是吸附气来进行气源对比,目前仍存在着争议。为此,利用四川盆地涪陵地区中二叠统茅口组一段(以下简称茅一段)的酸解气、吸附气进行对比,探讨了酸解气和吸附气在组分及碳同位素特征方面的差异,以及其在气源对比方面的适用条件。研究结果表明:①酸解气和吸附气在成分和同位素上存在着较大的差异,其中吸附气的重烃组分相对较高、碳同位素值整体偏重,导致这种差异的原因是甲烷和轻碳同位素更容易从吸附气中扩散散失,造成吸附气中相对富集重烃和重碳同位素;②酸解气是烃源岩在不同时期产出烃气的混合物,吸附气是烃气散失和供给达到平衡的产物,这也会导致二者在碳同位素值分布序列上的差异;③涪陵地区茅一段经过酸化压裂产出的天然气特征类似于烃源岩酸解气,而未进行酸化压裂产出的天然气特征则跟吸附气更加类似;④茅一段天然气藏是一个自生自储的碳酸盐岩气藏。结论认为,对于经过运移形成的气藏,产层未经酸化处理,产出的天然气应该跟烃源岩吸附气进行对比;而对于自生自储的碳酸盐岩气藏,一般需要经过酸化处理,其产出天然气则应跟烃源岩酸解气进行对比。
        The acidolysis gas in source rocks is the desorbed hydrocarbon gas in non-connected pores and carbonate crystal lattice, while the absorbed gas lies in the connected pores and is absorbed by surface. It is controversial about whether to use absorbed gas or acidolysis gas in gassource correlation. Using the absorbed gas and acidolysis gas in the first member of the Middle Permian Maokou Fm(hereinafter referred to as Mao 1 member) of Fuling area in the Sichuan Basin, the differences of components and carbon isotopes between absorbed gas and acidolysis gas and their applicable conditions in gas–source correlation were discussed. The results show that:(1) there are larger differences of components and isotopes between absorbed gas and acidolysis gas. The absorbed gas has more heavy hydrocarbons and heavier carbon isotope. This difference can be attributed to the easier diffusion of methane and light hydrocarbons in absorbed gas, leading to relatively enriched heavy hydrocarbons and heavier carbon isotope in absorbed gas;(2) acidolysis gas is a mixture of hydrocarbon gas formed during different stages, while absorbed gas is the result of equilibrium between diffusion and supply of hydrocarbon gas, which can result in the differences on carbon isotope sequences between them;(3) the characteristics of natural gas produced after acid fracturing in the Mao 1 member in Fuling area resembles those of acidolysis gas in source rocks, while the characteristics of natural gas produced without acid fracturing are more similar to those of adsorbed gas;(4) the natural gas pool of the Mao 1 member is a carbonate gas pool with self-generation and self-storage. It is concluded that for the gas pool formed after migration, its producing pays have not been processed by acid fracturing, the produced gas should be correlated with the adsorbed gas in source rocks; for the carbonate gas pool with self-generation and self-storage, acid fracturing is usually needed, and the produced gas should be correlated with the acidolysis gas in source rocks.

引文

[1]张同伟,王先彬,陈践发,邵波,李春园,徐雁前.鄂尔多斯盆地酸解烃碳同位素组成与气-源对比[J].科学通报,1996,41(3):242-244.Zhang Tongwei,Wang Xianbin,Chen Jianfa,Shao Bo,Li Chunyuan&Xu Yanqian.The carbon isotope composition and gas-source correlation in Ordos Basin[J].Chinese Science Bulletin,1996,41(3):242-244.
    [2]张同伟,陈践发,王先彬,邵波,李春园.天然气运移的气体同位素地球化学示踪[J].沉积学报,1995,13(2):70-76.Zhang Tongwei,Chen Jianfa,Wang Xianbin,Shao Bo&Li Chunyuan.Isopotic geochemical traces of gaseous hydrocarbons for natural gas migration[J].Acta Sedimentologica Sinica,1995,13(2):70-76.
    [3]张渠,蒋启贵,陶成,张彩明,把立强.南方海相烃源岩脱气分析方法及适用范围[J].石油实验地质,2008,30(5):527-531.Zhang Qu,Jiang Qigui,Tao Cheng,Zhang Caiming&Ba Liqiang.Degasification methods and application of high quality marine source rocks in South China[J].Petroleum Geology&Experiment,2008,30(5):527-531.
    [4]张居和,霍秋立,冯子辉.源岩脱附气和热模拟排出气轻烃对比实验研究[J].石油实验地质,2011,33(4):424-427.Zhang Juhe,Huo Qiuli&Feng Zihui.Comparison of light hydrocarbon between de-absorbed gas and discharged gas in thermal simulation of source rock[J].Petroleum Geology&Experiment,2011,33(4):424-427.
    [5]何治亮,胡宗全,聂海宽,李双建,许锦.四川盆地五峰组-龙马溪组页岩气富集特征与“建造-改造”评价思路[J].天然气地球科学,2017,28(5):724-733.He Zhiliang,Hu Zongquan,Nie Haikuan,Li Shuangjian&Xu Jin.Characterization of shale gas enrichment in the Wufeng-Longmaxi Formation in the Sichuan Basin and its evaluation of geological construction transformation evolution sequence[J].Natural Gas Geoscience,2017,28(5):724-733.
    [6]魏祥峰,郭彤楼,刘若冰.涪陵页岩气田焦石坝地区页岩气地球化学特征及成因[J].天然气地球科学,2016,27(3):539-548.Wei Xiangfeng,Guo Tonglou&Liu Ruobing.Geochemical features of shale gas of their genesis in Jiaoshiba block of Fuling shale gas field,Chongqing[J].Natural Gas Geoscience,2016,27(3):539-548.
    [7]冯建辉,牟泽辉.涪陵焦石坝五峰组-龙马溪组页岩气富集主控因素分析[J].中国石油勘探,2017,22(3):32-39.Feng Jianhui&Mou Zehui.Main factors controlling the enrichment of shale gas in Wufeng Formation-Longmaxi Formation in Jiaoshiba area,Fuling shale gas field[J].China Petroleum Exploration,2017,22(3):32-39.
    [8]厚刚福,周进高,谷明峰,姚倩颖,杨柳,潘立银,等.四川盆地中二叠统栖霞组、茅口组岩相古地理及勘探方向[J].海相油气地质,2017,21(1):25-31.Hou Gangfu,Zhou Jingao,Gu Mingfeng,Yao Qianying,Yang Liu,Pan Liyin,et al.Lithofacies paleogeography and exploration realms of Middle Permian Qixia Formation and Maokou Formation,Sichuan Basin[J].Marine Origin Petroleum Geology,2017,21(1):25-31.
    [9]刘宝珺,张继庆,许效松.四川兴文四龙下二叠统碳酸盐风暴岩[J].地质学报,1986,60(1):55-69.Liu Baojun,Zhang Jiqing&Xu Xiaosong.On the calcareous tempestites in the Lower Permian of Silong,Xingwen,Sichuan[J].Acta Geologica Sinica,1986,60(1):55-69.
    [10]汪泽成,江青春,黄士鹏,周慧,冯庆付,戴晓峰,等.四川盆地中二叠统茅口组天然气大面积成藏的地质条件[J].天然气工业,2018,38(1):30-38.Wang Zecheng,Jiang Qingchun,Huang Shipeng,Zhou Hui,Feng Qingfu,Dai Xiaofeng,et al.Geological conditions for massive accumulation of natural gas in the Mid-Permian Maokou Fm of the Sichuan Basin[J].Natural Gas Industry,2018,38(1):30-38.
    [11]陈建平,李伟,倪云燕,戴鑫,梁狄刚,邓春萍,等.四川盆地二叠系烃源岩及其天然气勘探潜力(二)--烃源岩地球化学特征与天然气资源潜力[J].天然气工业,2018,38(6):33-45.Chen Jianping,Li Wei,Ni Yunyan,Dai Xin,Liang Digang,Deng Chunping,et al.The Permian source rocks in the Sichuan Basin and its natural gas exploration potential(Part 2):Geochemical characteristics of source rocks and latent capacity of natural gas resources[J].Natural Gas Industry,2018,38(6):33-45.
    [12]冯子齐,刘丹,黄士鹏,吴伟,董大忠,彭威龙,等.四川盆地长宁地区志留系页岩气碳同位素组成[J].石油勘探与开发,2016,43(5):705-713.Feng Ziqi,Liu Dan,Huang Shipeng,Wu Wei,Dong Dazhong,Peng Weilong,et al.Carbon isotopic composition of shale gas in the Silurian Longmaxi Formation of the Changning area,Sichuan Basin[J].Petroleum Exploration and Development,2016,43(5):705-713.
    [13]戴金星,夏新宇,秦胜飞,赵靖舟.中国有机烷烃气碳同位素系列倒转的成因[J].石油与天然气地质,2003,24(1):1-6.Dai Jinxing,Xia Xinyu,Qing Shengfei&Zhao Jingzhou.Causation of partly reversed orders ofδ13C in biogenic alkane gas in China[J].Oil&Gas Geology,2003,24(1):1-6.
    [14]Xia Xinyu,Chen James,Braun R&Tang Yongchun.Isotopic reversals with respect to maturity trends due to mixing of primary and secondary products in source rocks[J].Chemical Geology,2013,339:205-212.
    [15]吴伟,罗超,张鉴,刘文平.油型气乙烷碳同位素演化规律与成因[J].石油学报,2016,37(12):1463-1471.Wu Wei,Luo Chao,Zhang Jian&Liu Wenping.Evolution law and genesis of ethane carbon isotope of oil type gas[J].Acta Petrolei Sinica,2016,37(12):1463-1471.
    [16]黄士鹏,吴小奇,陶小晚,廖凤蓉.蜀南纳溪-合江地区嘉陵江组天然气地球化学特征及其气源[J].地球化学,2011,40(6):525-535.Huang Shipeng,Wu Xiaoqi,Tao Xiaowan&Liao Fengrong.Geochemical characteristics and sources of natural gas reservoirs in Lower Triassic Jialingjiang Formation in Naxi-Hejiang area,Southern Sichuan Basin[J].Geochimica,2011,40(6):525-535.