川东北飞仙关组-长兴组天然气几个地球化学问题探讨

doi:10.11743/ogg20160307

Abstract

Abstract: Molecular and isotopic composition data of over hundred gas samples were combined with analytical data of source and reservoir rocks to deal with geochemical uncertainties of gases in the Feixianguan-Changxing Formations in Puguang,Yuanba and Tongnanba regions in northeastern Sichuan Basin.Discussion was focused on differentiation of cracking gases from oil and source rocks,causation of carbon isotope reversals in hydrocarbon gases and genetic relationship between CO₂ and H₂S.The results show that oil cracking gases from vuggy reservoirs abundant in solid bitumen in Puguang and Yuanba regions are relatively enriched in propane and have low ln(C₂/C₃) value (<3.0) as a diagnostic signature.In contrast,the source rock cracking gases (sourced from kerogen and bitumen cracking) from fractured reservoirs in Tongnanba region,exhibit a co-varying ln(C₁/C₂) and ln(C₂/C₃),and display higher values (>3.0) of ln(C₂/C₃),distinguishing from typical oil cracking gas.Isotope reversals,resulted possibly from various factors,appear extensively in hydrocarbon gases from the Formations.For the paraffin gas from the Feixianguan Fm of Hebachang gas field in Tongnanba region,the isotope reversal can be attributed to a mixture of post-mature dry gas generated from the Upper Permian Longtan source rocks and gas with slightly higher wetness coming from the Silurian source.Two non-hydrocarbon gas composition modes,namely high H₂S content-low CO₂ content and low H₂S content-high CO₂ content,are recognized in the gases experienced TSR from the Feixianguan-Changxing reservoirs.The relative proportions of these two non-hydrocarbon gases may be associated with overall interaction system of reservoir fluids and rocks.CO₂ with somewhat negative carbon isotope is possibly resulted from hydrocarbon oxidizing in high H₂S reservoirs,whereas,isotopically heavier CO₂ could be mainly formed by chemical degradation of carbonate when it presents in abnormally high amount.

Key words: carbon isotope reversal, carbon dioxide, oil cracking gas, source rock cracking gas, natural gas, northeastern Sichuan Basin

CLC Number:

TE122.1

Zhu Yangming, Sun Linting, Hao Fang, Zou Huayao, Guo Tonglou. Discussion on several geochemical issues of gases in Feixianguan-Changxing Formations in northeastern Sichuan Basin,China[J]. Oil & Gas Geology, 2016, 37(3): 354-362.

References

[1] 马永生, 蔡勋育, 赵培荣, 等.四川盆地大中型天然气田分布特征与勘探方向[J].石油学报, 2010, 31(3):347-354. Ma Yongsheng,Cai Xunyu,Zhao Peirong,et al.Distribution and further exploration of the large-medium sized gas fields in Sichuan Basin [J].Acta Petrolei Sinica,2010,31(3):347-354.
[2] 郭旭升,黄仁春,付孝悦,等.四川盆地二叠系和三叠系礁滩天然气富集规律与勘探方向[J].石油与天然气地质,2014,35(3):295-302. Guo Xusheng,Huang Renchun,Fu Xiaoyue,et al.Gas accumulation and exploration direction of the Permian and Triassic reservois of reef-bank facies in Sichuan Basin [J].Oil & Gas Geology,2014,35(3):295-302.
[3] 朱扬明, 王积宝, 郝芳, 等.川东宣汉地区天然气地球化学特征及成因[J], 地质科学, 2008, 43(3):518-532. Zhu Yangming,Wang Jibao,Hao Fang,et al.Geochemical characteristics and origin of natural gases from Xuanhan area,eastern Sichuan [J].Chinese Journal of Geology,2008,43(3):518-532.
[4] 郭彤楼.元坝深层礁滩气田基本特征与成藏主控因素[J].天然气工业, 2011, 31(10):12-16. Guo Tonglou.Basic characteristics of deep reef-bank reservoirs and major controlling factors of gas pools in the Yuanba gas field [J].Natural Gas Industry,2011,31(10):12-16.
[5] 王强, 徐立恒, 陈践发.川东北地区大中型气藏天然气特征及气源[J].石油与天然气地质, 2011, 32(6):867-872, 881. Wang Qiang,Xu Liheng,Chen Jianfa.Characteristics and origin of natural gas in large- and medium-sized gas reservoirs in northeast Sichuan Basin [J].Oil & Gas Geology,2011,32(6):867-872, 881.
[6] Hao Fang,Guo Tonglou,Zhu Yangming,et al.Evidence for multiple stages of oil cracking and thermochemical sulfate reduction in the Puguang gas field,Sichuan Basin,China [J].AAPG Bulletin,2008,92(5):611-637.
[7] 朱光有, 张水昌, 梁英波, 等.川东北地区飞仙关组高含H₂S天然气TSR成因的同位素证据[J].中国科学(D辑), 2005, 35(11):1037-1046. Zhu Guangyou,Zhang Shuichang,Liang Yingbo,et al.Isotopic evidence of TSR origin for natural gas bearing high H₂S contents in the Feixianguan Formation of northeastern Sichuan Basin,China [J].Science in China(Series D),2005,35(11):1037-1046.
[8] Cai Chunfang,Li Kaikai,Zhu Yangming,et al.TSR origin of sulfur in Permain and Triassic reservoir bitumen,East Sichuan [J].Organic Geochemistry,2010,41(9):871-878.
[9] 李开开,蔡春芳,姜磊,等.川东北地区长兴组酸性气藏中硫化氢来源及成因[J].石油与天然气地质,2015,36(2):183-192. Li Kaikai, Cai Chunfang, Jiang Lei,et al.Origin of H₂S in sour gas reservoirs in the Upper Permian Changxing Formation in northeastern Sichuan Basin [J].Oil & Gas Geology,2015,36(2):183-192.
[10] Prinzhofer A A,Huc A Y.Genetic and post-genetic molecular and isotopic fractionations in natural gases [J].Chemical Geology,1995,126(2):281-290.
[11] Behar F,Kressmann S,Rudkiewicz J L,et al.Experimental simulation in a confined system and kinetic modeling of kerogen and oil cracking [J].Organic Geochemistry,1992,19(1-3):173-189.
[12] 赵孟军, 张水昌, 廖志勤.原油裂解气在天然气勘探中的意义[J].石油勘探与开发, 2001, 28(4):47-49. Zhao Mengjun,Zhang Shuichang,Liao Zhiqin.The cracking gas from crude oil and its significance in gas exploration [J].Petroleum Exploration and Development,2001,28(4):47-49.
[13] 朱扬明, 李颖, 郝芳, 等.四川盆地东北部海、陆相储层沥青组成特征及来源[J].岩石学报, 2012, 28(3):870-878. ZhuYangming,Li Ying,Hao Fang,et al.Compositional characteristics and origin of marine and terrestrial solid reservoir bitumen in the northeast Sichuan Basin [J].Acta Petrologica Sinica,2012,28(3):870-878.
[14] Schenk H J,Primio R D,Horsfield B.The conversion of oil into gas in petroleum reservoirs(Part 1):Comparative kinetic investigation of gas generation from crude oils of lacustrine,marine and fluviodeltaic origin by programmed-temperature closed-system pyrolysis [J].Organic Geochemistry,1997,26(7/8):467-481.
[15] Hill R J,Tang Y,Kaplan I R.Insights into oil cracking based on laboratory experiments [J].Organic Geochemistry,2003,34(12):1651-1672.
[16] Pepper A S,Dodd T A.Simple kinetic models of petroleum formation(Part Ⅱ):oil-gas cracking[J].Marine and Petroleum Geology,1995,12(3):321-340.
[17] Guo Liguo,Xian Xianming,Tian Hui,et al.Distinguishing gases derived from oil cracking and kerogen maturation:Insights from laboratory pyrolysis experiments [J].Organic Geochemistry,2009,40(10):1074-1084.
[18] Machel H G,Krouse H R,Sassen R.Products and distinguishing criteria of bacterial and thermochemical sulfate reduction [J].Applied Geochemistry,1995,10(4):373-389.
[19] 赵文智, 王兆云, 张水昌, 等.不同地质环境下原油裂解生气条件[J].中国科学(D辑), 2007, 37(增刊Ⅱ):63-68. Zhao Wenzhi,Wang Zhaoyun,Zhang Shuichang,et al.Cracking conditions of crude oil under different geological environments [J].Science in China(Series D),2007, 37(S2):63-68.
[20] 戴金星, 夏新宇, 秦胜飞, 等.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,XiaXinyu,Qin Shengfei,et al.Causation of partly reversed orders of δ¹³C in biogenic alkane gas in China [J].Oil & Gas Geology,2003,24(1):1-6.
[21] Rodriguez N D,Philp R P.Geochemical characterization of gases from the Mississippian Barnett Shale,Fort Worth Basin,Texas [J].AAPG Bulletin,2010,94(11):1641-1656.
[22] Tilley B,Mclellan S,Hiebert S,et al.Gas isotope reversals in gas reservoirs of the western Canadian Foothills:Mature shale gases in disguise [J].AAPG Bulletin,2011,95(8):1399-1422.
[23] Xia Xinyu,James Chen,Robert Braun,et al.Isotopic reversals with respect to maturity trends due to mixing of primary and secondary products in source rocks [J].Chemical Geology,2013,339(SⅠ):205-212.
[24] Sherwood L B,Westgate T D,Ward J A,et al.Abiogenic formation of alkanes in the Earth's crust as a minor source for global hydrocarbon reservoirs [J].Nature,2002,416(6880):522-524.
[25] 戴金星, 倪云燕, 黄士鹏.四川盆地黄龙组烷烃气碳同位素倒转成因的探讨[J].石油学报, 2010, 31(5):710-717. Dai Jinxing,NiYunyan,Huang Shipeng.Discussion on the carbon isotopic reversal of alkane gases from the Huanglong Formation in the Sichuan Basin,China [J].Acta Petrolei Sinica,2010, 31(5):710-717.
[26] Machel H G.Bacterial and thermochemical sulfate reduction in diagenetic settings-old and new insights [J].Sedimentary Geology,2001,140(1-2):143-175.
[27] Krouse H R,Viau C A,Eliuk L S,et al.Chemical and isotopic evidence of thermochemical sulphate reduction by light hydrocarbon gases in deep carbonate reservoirs [J].Nature,1988,333(6172):415-419.

Discussion on several geochemical issues of gases in Feixianguan-Changxing Formations in northeastern Sichuan Basin,China

PDF (PC)

Knowledge

Cited

Abstract

Cite this article

share this article

References

Related Articles 15

Recommended Articles

Metrics

[1]	Chenglin LIU, Zhengang DING, Liyong FAN, Rui KANG, Sijie HONG, Yuxin ZHU, Jianfa CHEN, Haidong WANG, Nuo XU. Geochemical characteristics and enrichment factors of helium-bearing natural gas in the Ordos Basin [J]. Oil & Gas Geology, 2024, 45(2): 384-392.
[2]	Mingxing BAI, Zhichao ZHANG, Qiaozhen CHEN, Long XU, Siyu DU, Yexin LIU. Advances in research on CO₂ replacement for natural gas hydrate exploitation [J]. Oil & Gas Geology, 2024, 45(2): 553-564.
[3]	Lidong MI, Daqian ZENG, Hua LIU, Yandong GUO, Yanfeng LI, Zunzhao LI, Xudong SUN, Guangquan ZHANG, Chunhua LU, Peixian WANG. Key technologies and development trends for intelligent construction of underground gas storage facilities [J]. Oil & Gas Geology, 2024, 45(2): 581-592.
[4]	Chenglin LIU, Zhengang DING, Jianfa CHEN, Liyong FAN, Rui KANG, Haidong WANG, Sijie HONG, Anqi TIAN, Xueyong CHEN. Characteristics and helium-generating potential of helium source rocks in the Ordos Basin [J]. Oil & Gas Geology, 2023, 44(6): 1546-1554.
[5]	Han LI, Jinhua FU, Hancheng JI, Lei ZHANG, Yuwei SHE, Wei GUAN, Xianghui JING, Hongwei WANG, qian CAO, Gang LIU, Jiayi WEI. Bauxite series in the Upper Paleozoic weathering crusts in the southwestern Ordos Basin： Development and distribution of dominant reservoirs [J]. Oil & Gas Geology, 2023, 44(5): 1243-1255.
[6]	Li YOU, Yongbin QUAN, Lei TUO, Changyu TENG, Gaokun ZUO. Natural gas sources and migration pathways of the Baodao 21-1 gas field in the deep-water area of the Qiongdongnan Basin [J]. Oil & Gas Geology, 2023, 44(5): 1270-1278.
[7]	Jinbu LI, Yuehua CUI, Yougen HUANG, Shixiang FEI. Technologies and prospect of full-cycle development of low-permeability tight gas reservoirs with horizontal wells， Ordos Basin [J]. Oil & Gas Geology, 2023, 44(2): 480-494.
[8]	Hui TIAN, Zijin WU, Haifeng GAI, Xing WANG. Experimental study on late gas generation characteristics of the Middle Devonian sapropelic source rocks of in Northwestern Sichuan Basin [J]. Oil & Gas Geology, 2023, 44(1): 46-54.
[9]	Caiwei Fan, Aiqun Liu, Yunpeng Wu, Jingxian Hou. Gas charging and overpressure evolution history of the Neogene Huangliu Formation reservoir in Ledong 10 area， Yinggehai Basin [J]. Oil & Gas Geology, 2022, 43(6): 1370-1381.
[10]	Xusheng Guo, Dehua Zhou, Peirong Zhao, Zengqin Liu, Dianwei Zhang, Dongjun Feng, Fengcun Xing, Wei Du, Gang Chen, Fan Yang, Chuanxiang Sun. Progresses and directions of unconventional natural gas exploration and development in the Carboniferous-Permian coal measure strata， Ordos Basin [J]. Oil & Gas Geology, 2022, 43(5): 1013-1023.
[11]	Chengpeng Su, Ying He, Xiaobo Song, Bo Dong, Xiaoqi Wu. Reinterpretation of gas sources in the Middle Triassic Leikoupo Formation in Western Sichuan gas field， Sichuan Basin [J]. Oil & Gas Geology, 2022, 43(2): 341-352.
[12]	Xiaoqi Wu, Yingbin Chen, Changbo Zhai, Lingfang Zhou, Xiaojin Zhou, Jun Yang, Yanqing Wang, Xiaobo Song. Geochemical characteristics of bitumen and tracing of gas source in the Middle Triassic Leikoupo Formation， Western Sichuan Depression [J]. Oil & Gas Geology, 2022, 43(2): 407-418.
[13]	Deyu Gong, Changyong Zhao, Wenjun He, Long Zhao, Yumei Kong, Liya Ma, Ruiju Wang, Wei’an Wu. Genetic types and exploration potential of natural gas at northwestern margin of Junggar Basin [J]. Oil & Gas Geology, 2022, 43(1): 161-174.
[14]	Erting Li, Jun Jin, Jian Wang, Wanyun Ma, Shijia Chen, Cuimin Liu, Haijing Wang. Geochemical characteristics and genesis of mid-to-shallow natural gas on the periphery of Shawan Sag， Junggar Basin [J]. Oil & Gas Geology, 2022, 43(1): 175-185.
[15]	Qingmin Dong, Zhonggui Hu, Shiyue Chen, Shilin Li, Jialan Cai, Yixin Zhu, Yuying Zhang. Isotope geochemical responses and their geological significance of Changxing-Feixianguan Formation carbonates, northeastern Sichuan Basin [J]. Oil & Gas Geology, 2021, 42(6): 1307-1320.