Stable carbon isotope compositions and source rock geochemistry of the giant gas accumulations in the Ordos Basin, China

Dai, Jianhua; Li, Jian; X, Luo; Zhang, Wenzheng; Hu, Guoyi; Ma, Chenghua; Guo, Jianmin; Ge, Shouguo

doi:10.1016/j.orggeochem.2005.08.017

Cited by 275 publications

(200 citation statements)

References 7 publications

Supporting

Mentioning

198

Contrasting

Order By: Relevance

“…Coal measures are the most important source rocks for hydrocarbon gases in Chinese gas reservoirs, especially the giant gas fields (e.g., Dai et al, 1997Dai et al, , 2003Dai et al, , 2005Dai et al, , 2008. Several studies of the Kela 2 gas field, the largest in the Tarim Basin, China, demonstrated that hydrocarbon gases in this field were generated from Jurassic coal source rocks at the postmature stage (R o % > 1.3, Zhao et al, 2002;Liang et al, 2003;Zhao et al, 2005).…”

Section: Discussionmentioning

confidence: 99%

Hydrocarbon generation from coal, extracted coal and bitumen rich coal in confined pyrolysis experiments

Pan

et al. 2013

Organic Geochemistry

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Hydrocarbon generation from coal, extracted coal and bitumen rich coal in confined pyrolysis experiments

Pan

et al. 2013

Organic Geochemistry

View full text Add to dashboard Cite

Section: Geological Background and Samplesmentioning

confidence: 99%

“…1a) is the second largest sedimentary basin in China, with vast oil and gas reserves (Dai et al, 2005;Duan et al, 2008). It is an intracratonic depression basin covering an area of approximately 32 Â 10 4 km 2 (Li, 1996) and is well known as one of the most tectonically stable basins in China (Dai et al, 2005). It comprises six major structural units (Duan et al, 2008): the Yimeng uplift in the north, the Weibei uplift in the south, the Tianhuan depression and western edge thrust belt in the west, the Jinxi fold belt in the east, and the central Yishan slope (Fig.…”

Section: Geological Background and Samplesmentioning

confidence: 99%

“…It is the main oil and gas exploration and production area in the basin. One main source unit is Upper Paleozoic strata (Dai et al, 2005) marked by CarboniferousePermian coal measures; another is the lacustrine shales in the Yanchang Formation in Upper Triassic strata (Duan et al, 2008). Generally, most of the large conventional gas fields occur in the northern Yishan slope, and have been genetically related to the CarboniferousePermian coal measures (Dai et al, 2005).…”

Section: Geological Background and Samplesmentioning

confidence: 99%

“…One main source unit is Upper Paleozoic strata (Dai et al, 2005) marked by CarboniferousePermian coal measures; another is the lacustrine shales in the Yanchang Formation in Upper Triassic strata (Duan et al, 2008). Generally, most of the large conventional gas fields occur in the northern Yishan slope, and have been genetically related to the CarboniferousePermian coal measures (Dai et al, 2005). Most of the oil fields in the basin occur in the Southern Yishan slope, with oil mainly originating from the Yanchang shales (Dai et al, 2005;Duan, 2012;Duan et al, 2008;Wang et al, 1995).…”

Section: Geological Background and Samplesmentioning

confidence: 99%

See 2 more Smart Citations

The composition and its impact on the methane sorption of lacustrine shales from the Upper Triassic Yanchang Formation, Ordos Basin, China

Guo

Jia

Peng

et al. 2014

Marine and Petroleum Geology

145

View full text Add to dashboard Cite

Geochemical characteristics of light hydrocarbons and their influencing factors in natural gases of the Kuqa Depression, Tarim Basin, NW China

Peng

Wang

et al. 2018

Geological Journal

Self Cite

View full text Add to dashboard Cite

In order to determine the source of the light hydrocarbons in the Kuqa Depression of the Tarim Basin, Northwest China, their geochemical characteristics are documented, and possible influencing factors are discussed in a broad context on the basis of geochemical analyses of natural gas samples from 19 wells in combination with previously reported natural gas components and carbon isotope values from the same depression. The biomarker analytical results show that (a) methyl cyclohexane (37.5–60.3%) of natural gas predominates the C7 light hydrocarbon series (methyl cyclohexane, heptanes, and dimethyl cyclopentane), and (b) the heptane content (25.0–54.8%) is also relatively high. The C6–7 light hydrocarbon series (aromatics, normal alkanes, and cycloalkanes) have abnormally high aromatics (benzene and toluene) content (26.2–83.8%). Heptane value (13.31–37.77%) and isoheptane value (2.10–7.64%) indicate that the Kuqa natural gases are of high maturity and typical of coal‐derived gas (gas generated by sapropelic source rock). Their light hydrocarbons, however, appear to have some characteristics of mixed‐source organic matter. Specifically, the light hydrocarbons in the Dina 2 gas field show characteristics of the coal‐derived gas; those in the Dabei gas field show some features of the oil‐associated gas (gas generated by humic source rock), whereas those in the Kela 2 and Keshen 2 gas fields and Well Yangtake‐101 display characteristics of the mixed source organic matter. The abnormally high content of the aromatics in the Kuqa Depression may have resulted mainly from their high productivity during the thermal maturity of humic type organic matters and the gases accumulation of late stage. The different relative contents of the aromatics in various oil and gas fields may have been accounted by different organic matter types, maturity, and distribution patterns of source rocks.

show abstract

Stable carbon isotope compositions and source rock geochemistry of the giant gas accumulations in the Ordos Basin, China

Cited by 275 publications

References 7 publications

Hydrocarbon generation from coal, extracted coal and bitumen rich coal in confined pyrolysis experiments

Hydrocarbon generation from coal, extracted coal and bitumen rich coal in confined pyrolysis experiments

The composition and its impact on the methane sorption of lacustrine shales from the Upper Triassic Yanchang Formation, Ordos Basin, China

Geochemical characteristics of light hydrocarbons and their influencing factors in natural gases of the Kuqa Depression, Tarim Basin, NW China

Contact Info

Product

Resources

About