Geochemistry of deep coal-type gas and gas source rocks in Songliao Basin

X, Luo; Sun, Fenjin; Shao, Mingli; Wang, Zhihong; Zeng, Fangming; Zhao, Zhidan; Xia, Li; Feng, He

doi:10.1016/s1876-3804(09)60131-2

Cited by 16 publications

(3 citation statements)

References 5 publications

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“…It is the second-largest onshore sedimentary basin in China with polycyclic tectonic evolution (Yang and Pei, 1996). The Ordos Basin is commonly divided into six secondary tectonic units, that is, Weibei Uplift, Yishan Slope, Yimeng Uplift, Tianhuan Depression, West Margin Thrust Belt, and Jinxi Fault-fold Belt (Figure 1(a)) (Yang et al, 2008, 2005). The Daniudi gas field is situated at the junction between the Yishan Slope and Yimeng Uplift covering an area of 2003.71 km 2 (Figure 1(a)), and the overall structural configuration is a gentle monocline high in the northeast and low in the southwest (Sun et al, 2021).…”

Section: Geological Settingmentioning

confidence: 99%

“…However, there is no consensus on the origin and source of the Lower Paleozoic gas, although it is generally considered as mixing gas (Cai et al, 2005;Dai et al, 2005;Li et al, 2003;Xia et al, 1999a;Zou et al, 2007). It is controversial on whether the gas is dominated by coal-derived gas from the Upper Paleozoic coal-measure source rocks (Hu and Zhang, 2011;Liu et al, 2016;Mi et al, 2012) or oil-associated gas from carbonate source rocks in the Ordovician Majiagou Formation (Cai et al, 2005;Chen, 2002;Liu et al, 2016) or Carboniferous Taiyuan Formation (Dai et al, 2005;Xia et al, 1999b). The disagreement mainly resulted from different understandings of the geochemical characteristics of the Lower Paleozoic gas and the effectiveness of Lower Paleozoic source rocks (Liu et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Geochemical characteristics and their implication of light hydrocarbons in natural gas from the Lower Paleozoic carbonate reservoirs in the Daniudi gas field, Ordos Basin

Wang

et al. 2023

Energy Exploration & Exploitation

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The genetic types and source of the Lower Paleozoic natural gas in the Ordos Basin in China are controversial, and the geochemical characteristics of light hydrocarbons of natural gas in the fifth member of the Ordovician Majiagou Formation (O1m5) are studied by taking the Daniudi gas field as an example, in order to reveal the gas origin and source. The C5−7 light hydrocarbons are dominated by iso-alkanes rather than the n-alkanes, and the methyl cyclohexane (MCH) content is mostly higher than the nC7 content in C7 light hydrocarbons. The K1 and K2 values range from 1.06 to 1.16 and from 0.33 to 0.81, respectively. The geochemical characteristics of light hydrocarbons indicate that the Lower Paleozoic natural gas in the Daniudi gas field is mainly coal-derived gas which has been generated by the humic source rocks in the Upper Carboniferous Taiyuan Formation (C3t), with insignificant contribution by the O1m sapropelic source rocks. The O1m5 gas pools were accumulated through downward and lateral migration in the free phase. The aromatic contents in C6-7 and nC7/MCH ratios are easily affected by the factors such as water solubilization, adsorption in migration, evaporation, and migration fractionation, therefore, secondary alteration needs to be considered when using these parameters to identify the gas origin.

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Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Geochemical characteristics and their implication of light hydrocarbons in natural gas from the Lower Paleozoic carbonate reservoirs in the Daniudi gas field, Ordos Basin

Wang

et al. 2023

Energy Exploration & Exploitation

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“…The folds and fractures in this area developed in the Cretaceous Formation by the Mesozoic Yanshan movement, and formed a short axis anticline and syncline, predominantly in north-east striking. The faults in the area mainly belong to the Second Songhua River normal fault striking north-west and roughly parallel to the Second Songhua River, and the normal fault in northeast striking with a steep angle [22]. The first significant event cut the Cretaceous strata.…”

Section: Geology Of the Study Areamentioning

confidence: 99%

Simulation and Assessment of Shale Oil Leakage During in Situ Oil Shale Mining

Shuang¹,

Yi²,

Chenyang³

et al. 2014

Oil Shale

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Whether there is a risk of shale oil leakage along the depleted wells or multi-level geological fractures during in situ oil shale mining was predicted using the geological data from the Songliao Basin and survey wells in Fuyu county of Jilin province, China. The simulation results obtained employing the Transport of Unsaturated Groundwater and Heat 2 (TOUGH2) software indicate that oil leakage along depleted wells would entail greater risks to the upper aquifer, while the leakage along multi-level geological fractures would involve higher risks to the lower aquifer close to the shale beds. The distributions of shale oil saturation under the original and 1.3-fold formation pressures are slightly different, and the pollution halo somewhat increased only in an aquifer 40-50 m underground. The shale oil saturation in the leaking channel may be 0 during the leaking process.

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