Characteristics of hydrocarbon generation from organic macerals in Jurassic coal measures, Xinjiang, China

Anna, Ding; Rong, Hui; Qianxiang, Meng; Zhongnin, Zhang

doi:10.1007/bf02831075

Cited by 4 publications

(2 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the northwest of China are developed quite a number of Jurassic sedimentary basins, which are similar in many aspects to the Turpan-Hami and Santanghu basins (Ding Anna et al, 1999). In the Jurassic strata of these basins exist relatively abundant coal-series hydrocarbon source rocks, which are characterized as being relatively low in thermal evolution degree, with R o <0.9%.…”

Section: Low-mature Gas Resource Potentialitymentioning

confidence: 98%

Low-mature gases and their resource potentiality

Shi

2009

Chin. J. Geochem.

View full text Add to dashboard Cite

In the 80's of last century, based on the advances in natural gas exploration practice, the concepts of bio-thermocatalytic transitional-zone gas and early thermogenetic gas were proposed, and the lower limit R o values for the formation and accumulation of thermogenetic natural gases of industrial importance have been extended to 0.3%-0.4%. In accordance with the two-stage model established on the basis of carbon isotope fractionation involved in the formation of coal-type natural gases, the upper limit R o values of lowly evolved natural gases should be set at 0.8%-1.0%. This is the concept of low-mature gas which is commonly accepted at the present time. The Urengoy super-large gas field in western Siberian Basin is a typical example of low-mature gas field, where low-mature gas reserves account for 20% of the globally proven natural gas reserves, and this fully indicates the importance of this kind of resources. The proven reserves of natural gases in the Turpan-Hami Basin of China are approximate to 1000×10 8 m 3 , and the thermal evolution indices of source rocks are R o =0.4％-0.8％. The δ 13 C 1 values of methane are mainly within the range of -44‰--39‰ (corresponding to R o =0.6%-0.8%), and those of ethane are mainly within the range of -29‰--26‰, indicating that these natural gases should be designated to the coal-type low-mature gases. The light hydrocarbon evolution indices of natural gases also provide strong evidence suggesting that they are the coal-type low-mature gases. If so, low-mature gas in the Turpan-Hami Basin has been accumulated to such an extent as to be equivalent to the total reserves of three large-sized gas fields, and their existence is of great significance in the study and exploration of China's low-mature gases. If it is evidenced that the source rocks of low-mature gases are related mainly to coal measures, China's abundant lowly evolved coal series resources will provide a huge resource potentiality for the generation of low-mature gases.

show abstract

Section: Low-mature Gas Resource Potentialitymentioning

confidence: 98%

Low-mature gases and their resource potentiality

Shi

2009

Chin. J. Geochem.

View full text Add to dashboard Cite

show abstract

“…The Turpan-Hami Basin, West China, is famous for the emergency and evolvement of coal-derived oil theory in China (Huang Difan, 1999;Cheng Keming, 1997;Cheng Keming et al, 2002;Zhao Changyi et al, 1998;Chen Jianping et al, 1999;Wang Xiang and Zhang Min, 2008;Ding Anna et al, 1999). As more than 0.37×10 12 m 3 of gas was observed in the Turpan-Hami Basin (Zhou Haihun, 2007), scientists have paid more attention to the origin of natural gas there.…”

Section: Introductionmentioning

confidence: 98%

Geochemical characteristics and possible origin of natural gas in the Taibei Depression, Turpan-Hami Basin, China

Zhao

Zhang

Wang³

2010

Chin. J. Geochem.

View full text Add to dashboard Cite

292 chemical composition data and 82 isotopic composition data of gas samples collected from the Taibei Depression of the Turpan-Hami Basin, West China, were used in the study of their origin. Non-hydrocarbon gas is poor in most samples whereas abundant nitrogen in some samples is positively correlated with δ 13 C 1 . Although methane is the main constituent, higher molecular gaseous hydrocarbons, from ethane to pentane, are detected in most samples, in accordance with the distribution of oil reservoirs. The stable carbon isotope ratios of methane, ethane and propane are defined as δ 13 C 1 : -45.5‰ to -33.5‰, δ 13 C 2 : -30.2‰ to -10.5‰, and δ 13 C 3 : 27.6‰ to -11.2‰, respectively. According to the distribution of carbon isotope ratios, 2 families of gas can be grouped, most showing normal distribution of carbon isotopes, and others having obvious heavier carbon isotopes and being of abnormal distribution. Based on the isotopic composition, the disagreement between the relationship of Δ(δ 13 C 1 -δ 13 C 2 ) and δ 13 C 2 and that of Δ(δ 13 C 1 -δ 13 C 2 ) and δ 13 C 2 , and the calculated Ro, there are oil-associated gas, coal-derived gas and mixture of them. Other samples with obviously heavier isotopic compositions from the Yanmuxi oilfield of the Taibei Depression have been degraded by organisms.

show abstract

Geological and chronostratigraphic overview of the Upper Triassic and Jurassic successions of the Junggar Basin, NW China

Sha

Fang

Cheng

et al. 2023

View full text Add to dashboard Cite

The vast, widely-exposed terrestrial (lacustrine to fluvial) Upper Triassic-Jurassic (except Tithonian), successions of the Junggar Basin, not only record most of the stratigraphic boundaries of the Upper Triassic and Jurassic, including the Triassic-Jurassic boundary (TJB), Hettangian-Sinemurian, Sinemurian-Pliensbachian, Pliensbachian-Toarcian, Lower-Middle Jurassic, Middle-Upper Jurassic, Oxfordian-Kimmeridgian boundaries, but also record a range of the geologic, organic, palaeogeographic, palaeoclimatic events, known to have happened globally in the Late Triassic and Jurassic. The TJB is placed in the stratigraphic interval of the First Occurrence (FO) of Retitriletes austroclavatidites and Callialasporites dampieri and the Last Occurrence (LO) of Lunatisporites rhaeticus . The end-Triassic mass extinction (ETE) is characterized by the disappearance of most of the sporomorph and macro-plant taxa. The ETE occurred before the FO of the sporomorph Cerebropollenites thiergartii , and ended after it when life began to revive. The Junggar Basin was situated at a high latitude during the Late Triassic-Early Jurassic Pliensbachian ‘hothouse’ and ‘greenhouse’ periods. The Late Triassic-Middle Jurassic Bajocian was humid and warm, and rich in coal swamps, except the Toarcian, which yields little coal because it was relatively warmer and drier. It became arid from the early Late Jurassic Oxfordian.

show abstract

Characteristics of hydrocarbon generation from organic macerals in Jurassic coal measures, Xinjiang, China

Cited by 4 publications

References 1 publication

Low-mature gases and their resource potentiality

Low-mature gases and their resource potentiality

Geochemical characteristics and possible origin of natural gas in the Taibei Depression, Turpan-Hami Basin, China

Geological and chronostratigraphic overview of the Upper Triassic and Jurassic successions of the Junggar Basin, NW China

Contact Info

Product

Resources

About