Source Rock Potential and Depositional Environment of Upper Permian Oil Shales of the Lucaogou Formation in the Southeastern Junggar Basin, Northwest China

Gao, Yi; Wang, Y; Peng, Ping’an; He, Dajun; Wang, G; Wang, Z; Meng, Peilong; Sun, Zhenyu; Gong, Jian; Yang, Haining; Wu, Yuming

doi:10.3176/oil.2016.4.01

Cited by 3 publications

(3 citation statements)

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“…The TOC values of O y-3 oil shale between 832 m and 814.43 m were relatively lower than those of O y-2 oil shale, ranging between 6.68 and 13.97 wt%. This phenomenon can be explained by the variation of depositional environmental factors such as the seasonal different organic input into these sediments [ 8 ]. OM characteristics are the major controlling factors of the heterogeneous physical properties and function as the basement for pore-scale characterization of shale reservoirs [ 24 ].…”

Section: Resultsmentioning

confidence: 99%

“…The Paleogene Youganwo Formation and Neogene Shangcun Formation are two oil shale bearing formations in the Maoming Basin [ 8 , 9 ]. The former has been proven to be better in quality than the latter [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

“…The former has been proven to be better in quality than the latter [ 9 ]. The biomarker characteristics [ 10 , 11 ], pyrolysis characteristics [ 12 ] and reservoir utilization approaches [ 8 , [13] , [14] , [15] ] of oil shale in the Maoming Basin have been studied and reported. However, geological investigations on the quality of oil shale and influencing factors of OM enrichment mechanism receive less attention.…”

Section: Introductionmentioning

confidence: 99%

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Organic matter enrichment mechanism of Youganwo Formation oil shale in the Maoming Basin

Zhao¹,

Guo²,

Wang³

et al. 2023

Heliyon

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Organic matter enrichment mechanism of Youganwo Formation oil shale in the Maoming Basin

Zhao¹,

Guo²,

Wang³

et al. 2023

Heliyon

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Characteristics and Evaluation of the High‐Quality Source Rocks of Cretaceous Continental Shale Oil in Tonghua Basin, China

Shan

Guo

2019

Acta Geologica Sinica (Eng)

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The presence of shale oil in the Cretaceous Hengtongshan Formation in the Tonghua Basin, drilled by the well TD-01, has been discussed in this geological investigation for the first time. To evaluate the high-quality source rocks of Cretaceous continental shale oil, the distribution characteristics and the evolution of the ancient environment, samples of shale were systematically analyzed in terms of sedimentary facies, organic geochemistry, and organic carbon isotopic composition. The results demonstrate that a TOC value of 1.5% represents the lower-limit TOC value of the high-quality source rocks. Source rocks have an aggregate thickness of 211 m and contain abundant organic matter, with TOC values of 2.69% on average and a maximum value over 5.44%. The original hydrocarbon-generative potential value (S 1 +S 2 ) is between 0.18 mg/g and 6.13 mg/g, and the R o is between 0.97% and 1.40%. The thermal maturation of the source rocks is relatively mature to highly mature. The δ 13 C value range is between −34.75‰ and −26.53‰. The ratio of saturated hydrocarbons to aromatic hydrocarbons is 1.55 to 5.24, with an average of 2.85, which is greater than 1.6. The organic types are mainly type II 1 , followed by type I. The organic carbon source was C 3 plants and hydrophytes. The paleoclimate of the Hengtongshan Formation can be characterized as hot and dry to humid, and these conditions were conducive to the development of high-quality source rocks. A favorable paleoenvironment and abundant organic carbon sources provide a solid hydrocarbon generation base for the formation and accumulation of oil and gas in the shale of the Tonghua Basin.

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Episodic hydrothermal activities impact on organic matter enrichment in the post-collision rift basin of Permian Lucaogou Formation, southern Junggar Basin, NW China

Jiao

Zhou

et al. 2023

Front. Earth Sci.

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The factors controlling the organic matter accumulation in the organic-rich shale of the Lucaogou Formation in the southern Junggar Basin, remain controversial. To more explicitly reveal the hydrothermal events and its mechanism on the organic matter enrichment, we performed mineralogy and geochemistry methods on dolomite and black shale samples from Well FK-1 in Fukang Sag. The high (Fe + Mn)/Ti ratios, the enrichment of Ca, Mg, Fe, Mn, and REY, and multiple hydrothermal minerals (e.g., ankerite, dolomite, zeolite, authigenic albite, and microcline) suggest five episodes of hydrothermal events. In addition, the low-to-high-varied Sr/Ba, V/(V + Ni) (Al + Fe)/(Ca + Mg), and Sr/Cu ratios, as well as the dolomite formation all well indicate a brackish-saline, suboxic-anoxic, shallow to deep water condition under a warm-humid to hot-arid climate with rhythmic sedimentation. The fluctuated total organic carbon content (up to 12.16 wt%) suggest the periodic organic matter accumulation. Three patterns of organic matter enrichment occurred during the rift-drift transition of the southern Junggar Basin, productivity and preservation played distinguishing roles in different intervals. Productivity periodically fluctuated because of the episodic hydrothermal events and warm-humid climate changes. Preservation was triggered by the saline, anoxic, and well-stratified water setting under the relatively hot-arid climate, which became progressively favorable in the gradually stabilized basin.

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Source Rock Potential and Depositional Environment of Upper Permian Oil Shales of the Lucaogou Formation in the Southeastern Junggar Basin, Northwest China

Abstract: Abstract. Oil shales from the Yamalikeshan (YML), Shuimogou (SMG) and Sangonghe (SGH) sections of the Lucaogou Formation in the southeastern

Cited by 3 publications

References 32 publications

Organic matter enrichment mechanism of Youganwo Formation oil shale in the Maoming Basin

Organic matter enrichment mechanism of Youganwo Formation oil shale in the Maoming Basin

Characteristics and Evaluation of the High‐Quality Source Rocks of Cretaceous Continental Shale Oil in Tonghua Basin, China

Episodic hydrothermal activities impact on organic matter enrichment in the post-collision rift basin of Permian Lucaogou Formation, southern Junggar Basin, NW China

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