The geochemical characteristics and origin of Ordovician ultra-deep natural gas in the North Shuntuoguole area, Tarim Basin, NW China
Ultra-deep Ordovician in Shuntuoguole area, Tarim Basin, NW China, has complex oil & gas phases, in which light oil, volatile oil, condensate and dry gas phases coexisting. The study compares the geochemical characteristics and origin of Ordovician ultra-deep natural gas in the North Shuntuo...
Guardado en:
| Autores principales: | , , , , , , , , , |
|---|---|
| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Elsevier
2021
|
| Materias: | |
| Acceso en línea: | https://doaj.org/article/bff2bd48143148b385b81789608909b1 |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| id |
oai:doaj.org-article:bff2bd48143148b385b81789608909b1 |
|---|---|
| record_format |
dspace |
| spelling |
oai:doaj.org-article:bff2bd48143148b385b81789608909b12021-11-22T04:28:17ZThe geochemical characteristics and origin of Ordovician ultra-deep natural gas in the North Shuntuoguole area, Tarim Basin, NW China2468-256X10.1016/j.jnggs.2021.09.004https://doaj.org/article/bff2bd48143148b385b81789608909b12021-10-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2468256X21000638https://doaj.org/toc/2468-256XUltra-deep Ordovician in Shuntuoguole area, Tarim Basin, NW China, has complex oil & gas phases, in which light oil, volatile oil, condensate and dry gas phases coexisting. The study compares the geochemical characteristics and origin of Ordovician ultra-deep natural gas in the North Shuntuoguole (SB) area to that of gas in the Shuntuo (ST), South Shuntuoguole (SN), Gulong (GL), and Gucheng (GC) areas using natural gas composition, carbon isotope and hydrogen isotope data and light hydrocarbon data. The Ordovician ultra-deep natural gas in the SB area is wet gas, with dryness indexes ranging from 0.52 to 0.88 and minimal H2S content. The carbon isotopes of natural gas are relatively low, with δ13C1 and δ13C2 values ranging from −49.6‰ to −44.7‰ and −39.3‰ to −32.7‰, respectively. All the natural gas shows positive carbon and hydrogen isotope series. The n-alkane and iso-alkane dominate the C5–C7 light hydrocarbon, with the methylcyclohexane index of light hydrocarbon lower than 35%. All of the Ordovician natural gas in the Shuntuogule area is oil-type gas. The Ordovician natural gas in the SB area is dominated by kerogen cracking gas, with a small fraction of wet gas from the early stages of oil cracking, whereas, all of the gas in the ST, SN, GL and GC areas comes from oil cracking. The Cambrian source rocks led directly to both types of cracking gases. The distribution of two types of cracking gas in the Shuntuogule area is correlated with the maximum paleogeothermal temperature and (or) present temperature of the Ordovician. The maximum paleogeothermal temperature and present Ordovician temperature in the SB area are 170–180 °C and 150–160 °C, respectively, which are lower than those in ST and SN areas, and have not yet achieved the temperature of large amount oil cracking. As a result, light oil and volatile oil phases were preserved in the SB area, which was dominated by kerogen cracking gas, whereas reservoir phases varied from condensate to dry gas phases, and natural gas is oil-cracking gas, from ST to SN to GL to GC areas, due to large scale oil cracking caused by high present temperature and (or) paleo-geothermal temperature of the Ordovician.Anlai MaZhiliang HeLu YunXian WuNansheng QiuJian ChangHuixi LinZicheng CaoXiuxiang ZhuDonghua YouElsevierarticleNatural gasOrdovicianOil-type gasUltra-deepNorth Shuntuoguole (SB) areaTarim BasinGas industryTP751-762ENJournal of Natural Gas Geoscience, Vol 6, Iss 5, Pp 289-300 (2021) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
Natural gas Ordovician Oil-type gas Ultra-deep North Shuntuoguole (SB) area Tarim Basin Gas industry TP751-762 |
| spellingShingle |
Natural gas Ordovician Oil-type gas Ultra-deep North Shuntuoguole (SB) area Tarim Basin Gas industry TP751-762 Anlai Ma Zhiliang He Lu Yun Xian Wu Nansheng Qiu Jian Chang Huixi Lin Zicheng Cao Xiuxiang Zhu Donghua You The geochemical characteristics and origin of Ordovician ultra-deep natural gas in the North Shuntuoguole area, Tarim Basin, NW China |
| description |
Ultra-deep Ordovician in Shuntuoguole area, Tarim Basin, NW China, has complex oil & gas phases, in which light oil, volatile oil, condensate and dry gas phases coexisting. The study compares the geochemical characteristics and origin of Ordovician ultra-deep natural gas in the North Shuntuoguole (SB) area to that of gas in the Shuntuo (ST), South Shuntuoguole (SN), Gulong (GL), and Gucheng (GC) areas using natural gas composition, carbon isotope and hydrogen isotope data and light hydrocarbon data. The Ordovician ultra-deep natural gas in the SB area is wet gas, with dryness indexes ranging from 0.52 to 0.88 and minimal H2S content. The carbon isotopes of natural gas are relatively low, with δ13C1 and δ13C2 values ranging from −49.6‰ to −44.7‰ and −39.3‰ to −32.7‰, respectively. All the natural gas shows positive carbon and hydrogen isotope series. The n-alkane and iso-alkane dominate the C5–C7 light hydrocarbon, with the methylcyclohexane index of light hydrocarbon lower than 35%. All of the Ordovician natural gas in the Shuntuogule area is oil-type gas. The Ordovician natural gas in the SB area is dominated by kerogen cracking gas, with a small fraction of wet gas from the early stages of oil cracking, whereas, all of the gas in the ST, SN, GL and GC areas comes from oil cracking. The Cambrian source rocks led directly to both types of cracking gases. The distribution of two types of cracking gas in the Shuntuogule area is correlated with the maximum paleogeothermal temperature and (or) present temperature of the Ordovician. The maximum paleogeothermal temperature and present Ordovician temperature in the SB area are 170–180 °C and 150–160 °C, respectively, which are lower than those in ST and SN areas, and have not yet achieved the temperature of large amount oil cracking. As a result, light oil and volatile oil phases were preserved in the SB area, which was dominated by kerogen cracking gas, whereas reservoir phases varied from condensate to dry gas phases, and natural gas is oil-cracking gas, from ST to SN to GL to GC areas, due to large scale oil cracking caused by high present temperature and (or) paleo-geothermal temperature of the Ordovician. |
| format |
article |
| author |
Anlai Ma Zhiliang He Lu Yun Xian Wu Nansheng Qiu Jian Chang Huixi Lin Zicheng Cao Xiuxiang Zhu Donghua You |
| author_facet |
Anlai Ma Zhiliang He Lu Yun Xian Wu Nansheng Qiu Jian Chang Huixi Lin Zicheng Cao Xiuxiang Zhu Donghua You |
| author_sort |
Anlai Ma |
| title |
The geochemical characteristics and origin of Ordovician ultra-deep natural gas in the North Shuntuoguole area, Tarim Basin, NW China |
| title_short |
The geochemical characteristics and origin of Ordovician ultra-deep natural gas in the North Shuntuoguole area, Tarim Basin, NW China |
| title_full |
The geochemical characteristics and origin of Ordovician ultra-deep natural gas in the North Shuntuoguole area, Tarim Basin, NW China |
| title_fullStr |
The geochemical characteristics and origin of Ordovician ultra-deep natural gas in the North Shuntuoguole area, Tarim Basin, NW China |
| title_full_unstemmed |
The geochemical characteristics and origin of Ordovician ultra-deep natural gas in the North Shuntuoguole area, Tarim Basin, NW China |
| title_sort |
geochemical characteristics and origin of ordovician ultra-deep natural gas in the north shuntuoguole area, tarim basin, nw china |
| publisher |
Elsevier |
| publishDate |
2021 |
| url |
https://doaj.org/article/bff2bd48143148b385b81789608909b1 |
| work_keys_str_mv |
AT anlaima thegeochemicalcharacteristicsandoriginofordovicianultradeepnaturalgasinthenorthshuntuoguoleareatarimbasinnwchina AT zhilianghe thegeochemicalcharacteristicsandoriginofordovicianultradeepnaturalgasinthenorthshuntuoguoleareatarimbasinnwchina AT luyun thegeochemicalcharacteristicsandoriginofordovicianultradeepnaturalgasinthenorthshuntuoguoleareatarimbasinnwchina AT xianwu thegeochemicalcharacteristicsandoriginofordovicianultradeepnaturalgasinthenorthshuntuoguoleareatarimbasinnwchina AT nanshengqiu thegeochemicalcharacteristicsandoriginofordovicianultradeepnaturalgasinthenorthshuntuoguoleareatarimbasinnwchina AT jianchang thegeochemicalcharacteristicsandoriginofordovicianultradeepnaturalgasinthenorthshuntuoguoleareatarimbasinnwchina AT huixilin thegeochemicalcharacteristicsandoriginofordovicianultradeepnaturalgasinthenorthshuntuoguoleareatarimbasinnwchina AT zichengcao thegeochemicalcharacteristicsandoriginofordovicianultradeepnaturalgasinthenorthshuntuoguoleareatarimbasinnwchina AT xiuxiangzhu thegeochemicalcharacteristicsandoriginofordovicianultradeepnaturalgasinthenorthshuntuoguoleareatarimbasinnwchina AT donghuayou thegeochemicalcharacteristicsandoriginofordovicianultradeepnaturalgasinthenorthshuntuoguoleareatarimbasinnwchina AT anlaima geochemicalcharacteristicsandoriginofordovicianultradeepnaturalgasinthenorthshuntuoguoleareatarimbasinnwchina AT zhilianghe geochemicalcharacteristicsandoriginofordovicianultradeepnaturalgasinthenorthshuntuoguoleareatarimbasinnwchina AT luyun geochemicalcharacteristicsandoriginofordovicianultradeepnaturalgasinthenorthshuntuoguoleareatarimbasinnwchina AT xianwu geochemicalcharacteristicsandoriginofordovicianultradeepnaturalgasinthenorthshuntuoguoleareatarimbasinnwchina AT nanshengqiu geochemicalcharacteristicsandoriginofordovicianultradeepnaturalgasinthenorthshuntuoguoleareatarimbasinnwchina AT jianchang geochemicalcharacteristicsandoriginofordovicianultradeepnaturalgasinthenorthshuntuoguoleareatarimbasinnwchina AT huixilin geochemicalcharacteristicsandoriginofordovicianultradeepnaturalgasinthenorthshuntuoguoleareatarimbasinnwchina AT zichengcao geochemicalcharacteristicsandoriginofordovicianultradeepnaturalgasinthenorthshuntuoguoleareatarimbasinnwchina AT xiuxiangzhu geochemicalcharacteristicsandoriginofordovicianultradeepnaturalgasinthenorthshuntuoguoleareatarimbasinnwchina AT donghuayou geochemicalcharacteristicsandoriginofordovicianultradeepnaturalgasinthenorthshuntuoguoleareatarimbasinnwchina |
| _version_ |
1718418184239841280 |