天然气轻烃指标的地质意义——以鄂尔多斯盆地神木气田与塔西南坳陷山前带天然气藏为例

doi:10.11743/ogg20170505

摘要/Abstract

摘要： 轻烃中蕴含有丰富的地球化学信息，具有重要的地质意义。依据一系列轻烃参数指标，对神木气田及塔西南坳陷山前带的天然气进行了系统分析。结果显示：神木气田及阿克莫木气田以煤成气为主，前者个别井可能有少量油型气的混入，而柯克亚-柯东气田则为混合成因气。首次提出链烷烃指数标准，当其大于2时，为油型气或混合气，小于2时，为煤成气。根据Mango参数K₁和K₂值，神木气田的天然气来自同一套烃源岩，而塔西南坳陷山前带天然气则来自不同的烃源岩。根据Mango参数交会图版综合判断，神木气田及阿克莫木气田的天然气主要来源于陆相高等植物，而柯克亚-柯东气田的天然气主要为混合成因。根据异庚烷及庚烷辨识标准，神木气田处于低成熟-成熟阶段，阿克莫木气田处于成熟阶段，而柯克亚-柯东气田则属于高成熟阶段。

关键词: 成熟度, 轻烃指标, 气源对比, 成因类型, 天然气, 神木气田, 塔西南坳陷

Abstract: Light hydrocarbon has abundant geochemical information and great geological significance.Using a series of light hydrocarbon parameters,the natural gas from Shenmu gas field in the Ordos Basin and piedmont zone of the southwest Tarim Basin were analyzed.The results show that the Shenmu and Akemomu gas field are mainly coal-derived gas.However,the former is mixed by partial oil-type gas.The natural gas from Kekeya-Kedong gas field is mainly mixed gas.For the first time,the alkane index parameter is put forward.When the index is above 2,it means the gas is oil-derived gas or mixed gas.When it is below 2,it means the gas is oil-derived gas.The natural gas from Shenmu gas field originated from the same source rocks according to K₁ and K₂ parameter.However,the gas from piedmont zone of the southwest Ta-rim Basin originated from different source rocks.According to Mango parameter intersection chart,the source rocks of Shenmu and Akemomu gas field were mainly from terrestrial higher plant origins.However,the source rocks of Kekeya-Kedong gas field are mixed.Based on isoheptane and n-heptane parameter,the maturity of Shenmu,Akemomu and Kekeya-Kedong gas field is low-normal stage,mature gas and high maturity gas stage,respectively.

Key words: maturity, light hydrocarbon parameter, gas-source correlation, genetic type, natural gas, Shenmu gas field, southwest Tarim Basin

中图分类号:

TE122.1

韩文学,麻伟娇,侯连华,等. 天然气轻烃指标的地质意义——以鄂尔多斯盆地神木气田与塔西南坳陷山前带天然气藏为例[J]. 石油与天然气地质, 2017, 38(5): 869-877. doi: 10.11743/ogg20170505 Han Wenxue,Ma Weijiao,Hou Lianhua,et al. Geological significance of light hydrocarbon index of natural gas:Taking Shenmu gas field and piedmont zone of the southwest Tarim Basin as examples[J]. Oil & Gas Geology, 2017, 38(5): 869-877. doi: 10.11743/ogg20170505

参考文献

[1] 戴金星.利用轻烃鉴别煤成气和油型气[J].石油勘探与开发,1993,20(5):26-32. Dai Jinxing.Identification of coal formed gas and oil type gas by light hydrocarbons[J].Petroleum Exploration and Development,1993,20(5):26-32.
[2] 陈敬轶,贾会冲,李永杰,等.鄂尔多斯盆地伊盟隆起上古生界天然气成因及气源[J].石油与天然气地质,2016,37(2):205-209. Chen Jingyi,Jia Huichong,Li Yongjie,et al.Origin and source of natural gas in the Upper Paleozoic of the Yimeng Uplift,Ordos Basin[J].Oil & Gas Geology,2016,37(2):205-209.
[3] Mango F D.The light hydrocarbons in petroleum review[J].Organic Geochemistry,1997,26(7):417-440.
[4] Odden W.A study of natural and artificially generated light hydrocarbons (C₄-C₁₃) in source rocks and petroleum fluids from offshore Mid-Norway and the southernmost Norwegian and Danish sectors[J].Marine and Petroleum Geology,1999,16(8):747-770.
[5] 沈忠民,王鹏,刘四兵,等.川西坳陷中段天然气轻烃地球化学特征[J].成都理工大学学报:自然科学版,2011,38(5):500-506. Shen Zhongmin,Wang Peng,Liu Sibing,et al.Geochemical characteristics of light hydrocarbon in natural gas in the middle member of the west Sichuan Depression,China[J].Journal of Chengdu University of Technology:Science & Technology Edition,2011,38(5):500-506.
[6] 张春林,张福东,朱秋影,等.鄂尔多斯克拉通盆地寒武纪古构造与岩相古地理再认识[J].石油与天然气地质,2017,38(2):281-291. Zhang Chunlin,Zhang Fudong,Zhu Qiuying,et al.New understanding of the Cambrian palaeotectonic and lithofacies palaeogeography in the Ordos Craton Basin[J].Oil & Gas Geology,2017,38(2):281-291.
[7] 蒙晓灵,张宏波,冯强汉,等.鄂尔多斯盆地神木气田二叠系太原组天然气成藏条件[J].石油与天然气地质,2013,34(1):37-41. Meng Xiaoling,Zhang Hongbo,Feng Qianghan,et al.Gas accumulation conditions of the Permian Taiyuan Formation in Shenmu gas field,Ordos Basin[J].Oil & Gas Geology,2013,34(1):37-41.
[8] Han W X,Tao S Z,Hu G Y,et al.Light hydrocarbon geochemical characteristics and their application in Upper Paleozoic,Shenmu gas field,Ordos Basin[J].Energy Exploration & Exploitation,2016,35(1):103-121.
[9] 张学丰,李晓锋,李宗杰,等.白云岩的残余结构及其沉积相的意义-以塔中地区中-下奥陶统为例[J].石油与天然气地质,2017,38(4):722-728. Zhang Xufeng,Li Xiaofeng,Li Zongjie,et al.Relict texture of dolostones and its significance to sedimentary facies:A case study from the Middle-Lower Ordovician in Tazhong area,Tarim Basin[J].Oil & Gas Geology,2017,38(4):722-728.
[10] 杜金虎,王招明,雷刚林,等.柯东1风险探井的突破及其战略意义[J].中国石油勘探,2011,16(2):1-11. Du Jinhu,Wang Zhaoming,Lei Ganglin,et al.A discovery in well Kedong-1 and its exploration significance[J].China Petroleum Exploration,2011,16(2):1-11.
[11] 李丹梅,汤达祯,刑卫新,等.塔西南前陆冲断带油气成藏地质条件的分段性[J].地学前缘,2008,15(2):178-185. Li Danmei,Tang Dazhen,Xing Weixin,et al.Segmentation characteristics of geological conditions for reservoir forming in the foreland fold-thrust zone of the southwest Tarim Basin[J].Earth Science Frontiers,2008,15(2):178-185.
[12] Huang D F,Liu B Q,Wang T D,et al.Genetic type and maturity of Lower Paleozoic marine hydrocarbon gases in the eastern Tarim Basin[J].Chemical Geology,1999,162(1):65-77.
[13] 史江龙,李剑,李志生,等.塔里木盆地塔中隆起寒武系深层油气地球化学特征及成因[J].石油与天然气地质,2017,38(2):302-310. Shi Jianglong,Li Jian,Li Zhisheng,et al.Geochemical characteristics and origin of the deep Cambrian oil and gas in the Tazhong Uplift,Tarim Basin[J].Oil & Gas Geology,2017,38(2):302-310.
[14] Liu Q Y,Dai J X,Zhang T W,et al.Genetic types of natural gas and their distribution in Tarim Basin,NW China[J].Journal of Natural Science and Sustainable Technology,2007,1:603-620.
[15] 莫午零,林潼,张英,等.西昆仑山前柯东-柯克亚构造带油气来源及成藏模式[J].石油实验地质,2013,35(4):364-371. Mo Wuling,Lin Tong,Zhang Ying,et al.Hydrocarbon origin and accumulation model of Kedong-Kekeya tectonic belt in piedmont of West Kunlun Mountain[J].Petroleum Geology & Experiment,2013,35(4):364-371.
[16] 林壬子.轻烃技术在油气勘探中的应用[M].北京:中国地质大学出版社,1990:91-110. Lin Renzi.Application of light hydrocarbon technology in oil and gas exploration[M].Beijing:China University of Geosciences Press,1990:91-110.
[17] 戴金星.各类烷烃气的鉴别[J].中国科学B辑,1992,22(2):185-193. Dai Jinxing.Identification of variousalkane gases[J].Science in China:Series B,1992,22(2):185-193.
[18] 胡惕麟,戈葆雄,张义纲,等.源岩吸附烃和天然气轻烃指纹参数的开发和应用[J].石油实验地质,1990,12(4):375-394. Hu Tilin,Ge Baoxiong,Zhang Yigang,et al.The development and application of fingerprint parameters for hydrocarbons absorbed by source rocks and light hydrocarbons in natural gases[J].Petroleum Geology & Experiment,1990,12(4):375-394.
[19] 胡国艺,李剑,李谨,等.判识天然气成因的轻烃指标探讨[J].中国科学D辑,2007,37(S2):111-117. Hu Guoyi,Li Jian,Li Jin,et al.Preliminary study on the origin identification of natural gas by parameters of light hydrocarbon[J].Science in China:Series D,2007,37(S2):111-117.
[20] 秦建中,郭树之,王东良.苏桥煤型气田地化特征及其对比[J].天然气工业,1991,11(5):21-26. Qin Jianzhong,Guo Shuzhi,Wang Dongliang.Geochemical characteristics of Suqiao coal-formed gas field and their contrast[J].Natural Gas Industry,1991,11(5):21-26.
[21] Dai J X,Xia X Y,Qin S F,et al. Origins of partially reversed alkane δ¹³C values for biogenic gases in China[J].Organic Geochemistry,2004,35(4):405-411.
[22] Snowdon,Lloyd R,Powell T G.Immature oil and condensate-Modification of hydrocarbon generation model for terrestrial organic matter[J].AAPG Bulletin,1982,66(6):755-788.
[23] Leythaeuser D,Schaefer R G,Cornford C.Generation and migration of light hydrocarbon (C₂-C₇) in sedimentary basin[J].Organic Geochemistry,1979,1(4):191-204.
[24] 于聪,田兴旺,李谨.塔里木盆地台盆区油型气轻烃组成及应用[J].天然气地球科学,2013,24(4):774-783. Yu Cong,Tian Xingwang,Li Jin.The characteristics of light hydrocarbon in oil-associated gas and its application in platform area of Tarim Basin[J].Natural Gas Geoscience,2013,24(4):774-783.
[25] 戴金星.天然气碳氢同位素特征和各类型天然气类型鉴别[J].天然气地球科学,1993,4(3):1-40. Dai Jinxing.Characteristics of carbon and hydrogen isotopic and identification of gas[J].Natural Gas Geoscience,1993,4(3):1-40.
[26] 戴金星,戚厚发,宋岩.鉴别煤成气和油型气若干指标的初步探讨[J].石油学报,1985,6(2):35-42. Dai Jinxing,Qi Houfa,Song Yan.On the indicators for identifying gas from oil and gas from coal measure[J].Acta Petrolei Sinica,1985,6(2):35-42.
[27] 戴金星,李鹏举.中国主要含油气盆地天然气的C_5-8轻烃单体烃系列碳同位素研究[J].科学通报,1994,39(22):2071-2073. Dai Jinxing,Li Pengju.Study on carbon isotopic of the light hydrocarbon monomer of the major oil-and gas-bearing basins in China[J].Chinese Science Bulletin,1994,39(22):2071-2073.
[28] Mango F D.The origin of light cycloalkanes in petroleum[J].Geochimica Et Cosmochimica Acta,1990, 54(1):23-27.
[29] Mango F D.An invariance in the isoheptanes of petroleum[J].Science,1987,237(4814):514-517.
[30] Mango F D.The origin of light hydrocarbons in petroleum:A kinetic test of the steady-state catalytic hypothesis[J].Geochimica Et Cosmochimica Acta,1990,54(5):1315-1323.
[31] 朱扬明,张春明.Mango轻烃参数在塔里木原油分类中的应用[J].地球化学,1999,28(1):26-33. Zhu Yangming,Zhang Chunming.Applications of Mango's light hydrocarbon parameters in classification of oils from Tarim Basin[J].Geochimica,1999,28(1):26-33.
[32] Ten Haven H.L.Applications and limitations of Mango's light hydrocarbon parameters in petroleum correlation studies[J].Organic Geochemistry,1996,24(10):957-976.
[33] Thompson K F M.Classification and thermal history of petroleum based on light hydrocarbons[J].Geochimica Et Cosmochimica Acta,1983,47(2):303-316.
[34] 沈平,王晓锋,王志勇,等.吐哈盆地天然气轻烃地球化学特征与低熟气判识[J].科学通报,2010,55(23):2307-2311. Shen Ping,Wang Xiaofeng,Wang Zhiyong,et al.Geochemical characteristics of light hydrocarbons in natural gases from the Turpan-Hami Basin and identification of low-mature gas[J].Chinese Science Bulletin,2010,55(23):2307-2311.