Carbon isotope characteristics, origin and distribution of the natural gases from the Tertiary salty lacustrine facies in the West Depression Region in the Qaidam Basin

Zhang, Xiaobao; Hu, Yong; Ma, Licheng; Meng, Zhaoping; Duan, Yi; Zhou, Shengyang; Peng, Dehua

doi:10.1360/03yd9061

Cited by 8 publications

(7 citation statements)

References 9 publications

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“…Chronology in the Xiaganchaigou and Lower Shangganchaigou Formation is based on magnetostratigrapy . Dotted lines connect samples that have been sampled in sequence Int J Earth Sci (Geol Rundsch) (2009) 98:1063-10751071 could also cause the differences (Zhang et al 2003). We sampled the southern limb of the anticline in the Third Valley and the northern limb in the Fifth Valley, which represents a ''downward'' extension of the Third Valley section (Fig.…”

Section: Discussionmentioning

confidence: 99%

Monitoring Cenozoic climate evolution of northeastern Tibet: stable isotope constraints from the western Qaidam Basin, China

Rieser

Bojar

Neubauer

et al. 2008

Int J Earth Sci (Geol Rundsch)

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Carbon and oxygen stable isotopic composition of Cenozoic lacustrine carbonates from the intramontane Qaidam Basin yields cycles of variable length and shows several distinct events driven by tectonics and climate changes. From Eocene to Oligocene, the over-all trend in the d 13 C composition of lacustrine carbonates shows a shift toward higher values, possibly related to higher proportions of dissolved inorganic carbon transported to the lake or lower input of soil derived CO 2 . At the same time, the d 18 O composition of lacustrine carbonates is decreasing in accordance with the global cooling trend and northwards drifting of the whole region. During the Miocene, distinct isotopic events can be recognized, although their interpretation and linkage to a certain tectonic event remains difficult. These events may be related to uplift in the Himalayas, to the strongest phase of uplift in the Altyn Mountains, to pronounced subsidence of the Qaidam Basin or to the expansion of C4 plants on land. Generally cold, highly evaporative conditions can be deduced from enrichment of d 18 O isotopic compositions during Pliocene and Quaternary times.

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Section: Discussionmentioning

confidence: 99%

Monitoring Cenozoic climate evolution of northeastern Tibet: stable isotope constraints from the western Qaidam Basin, China

Rieser

Bojar

Neubauer

et al. 2008

Int J Earth Sci (Geol Rundsch)

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“…Furthermore, δ 13 C 2 is often used as an identification of different types of gas. Zhang et al [17] proposed a δ 13 C 2 > -23:0‰ cutoff for coal-type [13,38]). Figure 4: A cross plot of n-C 7 /MCC 6 vs. toluene/n-C 7 of gases in the western Qaidam Basin (modified after [37]).…”

Section: Geofluidsmentioning

confidence: 99%

“…Besides, the carbon isotope of ethane is widely used to distinguish the coal-type gas and the oil-type gas [14], including the cross plot of δ 13 C 1 -δ 13 C 2δ 13 C 3 , δ 13 C 1 -δ 13 C CO2 , δ 13 C 2-3 -ln(C 2 /C 3 ), and so on [12,15,16]. Natural gas in the western Qaidam Basin is mainly derived from saline lacustrine depositions which are enriched in δ 13 C 2 , and Zhang et al [17] modified the classification criteria for coal-type gas and oil-type gas. Owing to the complex formation process of natural gas and secondary alteration, the genetic identification of different types of natural gas should be based on multiple parameters.…”

Section: Introductionmentioning

confidence: 99%

Geochemical Characteristics of Natural Gas and Hydrocarbon Charge History in the Western Qaidam Basin, Northwest China

Chen

Zhou

et al. 2020

Geofluids

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31 natural gases in the western Qaidam Basin of China were collected and analyzed for gas composition including light hydrocarbons (C5-C7) and carbon isotopic characteristics. Based on genetic type obtained from C1-C3 and C7 fractions, four types of gases are identified: oil-type gas, coal-type gas, biodegraded gas, and mixed gas. The oil-type gas is the predominant-type gas in the western Qaidam Basin; coal-type gas is mainly distributed in the Zhahaquan and Nanyishan fields; mixed gas is mainly in the Zhahaquan, Wunan, and Nanyishan fields; and biodegraded gas is mainly distributed in the Huatugou and Yuejinerhao fields. According to the empirical relationship between δ13C1 and the equivalent vitrinite reflectance (Ro, %) of source rock, the Ro values of gas range from 0.6% to 1.5%, with an average value of 0.9%. The generation temperatures of major reservoired hydrocarbons (GTMRH) calculated from the C7 components range from 115.6°C to 141.7°C, with an average value of 126.5°C. These two maturity indicators have relatively positive correlation and reveal that the maturity of gas increases from west to east in the southwestern Qaidam Basin. Moreover, combining GTMRH with the homogenous temperature of petroleum inclusions, it is inferred that major petroleum charge in the western Qaidam Basin mainly occurred during the late period of the Himalayan movement. Deep hydrocarbon fluid sources were found in the Shizigou, Yingdong, Zhahaquan, and Nanyishan fields; thus, the deep reservoirs of paleouplifts adjacent to the hydrocarbon-generating depressions are estimated as a favorable area for further exploration in the western Qaidam Basin.

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“…old, which indicate that thermal effect is the main cause of China natural gas generation, namely thermal cracking gas, such as the thermal cracking gas from marine reservoirs of Sichuan Basin and Xujiaweizi region of Songliao Basin, etc. The next is microbial action, which forms biogenic gas, such as the typical biogenic gas of Sanhu region of Qaidam Basin [20] , and mixed gas of biogenic gas and other gas in Western Slope of Songliao Basin. Figure 4 is the typical relationship figure of China natural gas carbon isotope, which marks the borderline of varying origin natural gas.…”

Section: Natural Gas Carbon Isotopic Featuresmentioning

confidence: 99%

Natural gas origins of large and medium-scale gas fields in China sedimentary basins

Zhang

Zhu

2008

Sci. China Ser. D-Earth Sci.

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China sedimentary basins present abundant natural gas resource thanks to its unique geological settings. Marine highly-matured hydrocarbon source rocks, widespread coal-measure strata and low temperature Quaternary saline strata, etc., indicate the wide foreground of China natural gas resources. Up to now, most of the petroliferous basins have been discovered to have wholesale natural gas accumulation from Precambrian, Paleozoic, Mesozoic to Cenozoic in the east, the central, the west and the coast of China. These large and medium-scale gas reservoirs are mainly composed of hydrocarbon gas with big dry coefficient, tiny non-hydrocarbon, wide carbon isotope distribution and varying origin types, the hydrocarbon gas includes coal-formed gas, oil-formed gas, biogenic gas and inorganic gas, etc. Coal-formed gas is the main type of China natural gas resources, in particular several explored large-scale gas fields (>100 billion cubic meter) of Kela 2, Sulige and Daniudi, etc., they all belong to coal-formed gas fields or the gas fields consisting mostly of coal-formed gas. Oil-formed gas is also abundant in China marine basins, for example marine natural gas of Sichuan Basin generated from crude oil cracking gas. Primary and secondary biogenic gas fields were discovered respectively in the Qaidam Basin and Western Slope of Songliao Basin. In addition, inorganic gases are mainly distributed in the eastern China, in particular the Songliao Basin with abundant carbon dioxide accumulation, indicating that the eastern China present large exploration potential of inorganic gas.natural gas origin, sedimentary basin, large and medium-scale gas field China sedimentary basins present distinctive geological characteristics. Because of complex basin structure and backfilling features, they formed various mineral resources. Paleozoic marine strata are mainly of gas generation in the present because they present hydrocarbon source rocks with abundant organic matter, big burial depth and highly matured degree caused by high palaeogeothermal. The wide range and large-scale coal-forming periods of Permo-Carboniferous and Jurassic provided abundant material base for China coal-formed gas formation. The developments of rift basin with discordogenic faults provided good conditions for inorganic gas generation in Cenozoic. It is possible that biogenic gas could be generated massively because of the environments of low temperature and high salinity made in Quaternary. Therefore, the unique geological settings made China have abundant natural gas. Large-scale natural gas reservoirs (fields) have been discovered in varying regions and different time. Especially, in recent years, China maintained the momentum [1] of a sustained and rapid natural gas industry development. Up to the end of 2005, the proved gas reserve is 4964.729 billion cubic metres, 7 large gas fields with over 100 billion cubic meters have been discovered, approximately accounting for 50% of the total proved reserve in China. Many basins have presented good exploration prosp...

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Carbon isotope characteristics, origin and distribution of the natural gases from the Tertiary salty lacustrine facies in the West Depression Region in the Qaidam Basin

Cited by 8 publications

References 9 publications

Monitoring Cenozoic climate evolution of northeastern Tibet: stable isotope constraints from the western Qaidam Basin, China

Monitoring Cenozoic climate evolution of northeastern Tibet: stable isotope constraints from the western Qaidam Basin, China

Geochemical Characteristics of Natural Gas and Hydrocarbon Charge History in the Western Qaidam Basin, Northwest China

Natural gas origins of large and medium-scale gas fields in China sedimentary basins

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