Marine hydrocarbon source rocks of the Upper Permian Longtan Formation and their contribution to gas accumulation in the northeastern Sichuan Basin, southwest China

Borjigen, Tenger; Qin, Jianzhong; Fu, Xiaodong; Yang, Yibo; Lu, Lingbin

doi:10.1016/j.marpetgeo.2014.05.005

Cited by 29 publications

(12 citation statements)

References 25 publications

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“…In summary, the non-TSR altered solid bitumen may have been derived from the P 3 l/P 3 w oil-prone kerogen or sapropelic-dominated source rocks in the Bazhong-Dazhou depression based on 13 C values and biomarkers, supporting the conclusions made by Borjigen et al [4] and Jin et al [3]. 34 S kero values.…”

Section: Correlation Of Solid Bitumen With Kerogen Based Onsupporting

confidence: 83%

“…Upper Permian Longtan (P 3 l) Fm source rocks include gas-prone marine-terrigenous transitional facies black shale, mudstone, and laminar coal seams in the middle and southern part of NE Sichuan Basin [8,23,28,29] and deep water shelf facies oil-prone source rocks in the BazhongDazhou depression in the northern Sichuan Basin such as in wells HB1, MB3, and PG5 [4,29]. The source rocks in the Bazhong-Dazhou area were measured to have TOC from 0.6 to 10.8% with an average of 2.06% ( = 53) and thickness from 40 m to 140 m with the maximum of 160 m in MB, PG, and DU gas fields [27].…”

Section: Geological Settingmentioning

confidence: 99%

“…The solid bitumen and associated gases may have mainly derived from Upper Permian Longtan Formation based on correlation of biomarkers and 13 C values of the source rocks and solid bitumen (pyrobitumen) in reservoirs [1][2][3][4]. However, the conclusion may not be effective, based on the consideration of the following two aspects.…”

Section: Introductionmentioning

confidence: 99%

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Biomarkers and C and S Isotopes of the Permian to Triassic Solid Bitumen and Its Potential Source Rocks in NE Sichuan Basin

Cai

et al. 2017

Geofluids

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The potential parent source rocks except from Upper Permian Dalong Formation (P 3 d) for Upper Permian and Lower Triassic solid bitumen show high maturity to overmaturity with equivalent vitrinite reflectance (ER ) from 1.7% to 3.1% but have extractable organic matter likely not contaminated by younger source rocks. P 3 d source rocks were deposited under euxinic environments as indicated by the pyrite 34 S values as light as −34.5‰ and distribution of aryl isoprenoids, which were also detected from the Lower Silurian (S 1 l) source rock and the solid bitumen in the gas fields in the west not in the east. All the solid bitumen not altered by thermochemical sulfate reduction (TSR) has 13 C and 34 S values similar to part of the P 3 l kerogens and within the S 1 l kerogens. Thus, the eastern solid bitumen may have been derived from the P 3 l kerogens, and the western solid bitumen was likely to have precracking oils from P 3 l kerogens mixed with the S 1 l or P 3 d kerogens. This case-study tentatively shows that 13 C and 34 S values along with biomarkers have the potential to be used for the purpose of solid bitumen and source rock correlation in a rapidly buried basin, although further work should be done to confirm it.

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Section: Correlation Of Solid Bitumen With Kerogen Based Onsupporting

confidence: 83%

Section: Geological Settingmentioning

confidence: 99%

See 1 more Smart Citation

Biomarkers and C and S Isotopes of the Permian to Triassic Solid Bitumen and Its Potential Source Rocks in NE Sichuan Basin

Cai

et al. 2017

Geofluids

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“…4a-4b), with an average content of 85.37% (Table 1). Borjigen et al (2014) has also identified this characteristic, who found that the Longtan Formation mudrocks in the Huayingshan area are mainly vitrinites, accounting for 85% of the total organic macerals. The secondary macerals with inertinite in these mudrocks account for 0% -33% (average of 12.86%).…”

Section: Organic Petrological Characteristicsmentioning

confidence: 90%

“…The Sichuan Basin experienced an intensive stretching effect and then generally subsided during the Late Permian period, and a group of organic-rich mudrocks were deposited in the continental rift depression. The Upper Permian Longtan/ Wujiaping Formation (P 3 l/P 3 w) has been identified as an effective source rock within and around the Sichuan Basin (Borjigen et al, 2014). The Longtan Formation (P 3 l) mainly consists of mudstone, calcareous mudstone, sandstone, and coal seam (Fig.…”

Section: Geological Settingsmentioning

confidence: 99%

Nanoscale Pore Characteristics of the Upper Permian Mudrocks from a Transitional Environment in and around Eastern Sichuan Basin, China

Cao

Liu

et al. 2019

Acta Geologica Sinica (Eng)

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Nanoscale pore characteristics of the Upper Permian Longtan transitional mudrocks and their equivalent strata Wujiaping Formation marine mudrocks in and around the eastern Sichuan Basin was investigated using field emission scanning electron microscopy (FE‐SEM) and low‐pressure N2 adsorption experiments. The results indicate that the Upper Permian mudrock is at a mature stage with total organic carbon (TOC) values ranging between 0.47% and 12.3%. The Longtan mudrocks mainly contain vitrinite, and their mineral composition is primarily clay. In contrast, the Wujiaping mudrocks are dominated by sapropelinite and solid bitumen, and their mineral compositions are mainly quartz and a notably high amount of pyrite. The FE‐SEM reveals that clay mineral pores and microcracks are the common pore types in the Longtan mudrocks. The specific surface area and pore volume depend on the clay content but are negatively correlated with the TOC. The generation of nanometer pores in the Longtan mudrocks is caused by high clay mineral contents. Meanwhile, the Wujiaping mudrock mainly contains OM pores, and the pore parameters are positively correlated with the TOC. The OM pore development exhibits remarkable differences in the Longtan and Wujiaping mudrocks, which might be related to their sedimentary facies and maceral fractions. Vitrinite and inertinite appear as discrete particles in these mudrocks and cannot generate pores during thermal maturation. Sapropelinite often contains many secondary pores, and solid bitumen with large particles, usually with several pores, is not the major contributor to the pore system of the investigated mudrock.

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Comparison of Formation Conditions of Source Rocks of Fengcheng and Lucaogou Formations in the Junggar Basin, NW China: Implications for Organic Matter Enrichment and Hydrocarbon Potential

et al. 2023

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Marine hydrocarbon source rocks of the Upper Permian Longtan Formation and their contribution to gas accumulation in the northeastern Sichuan Basin, southwest China

Cited by 29 publications

References 25 publications

Biomarkers and C and S Isotopes of the Permian to Triassic Solid Bitumen and Its Potential Source Rocks in NE Sichuan Basin

Biomarkers and C and S Isotopes of the Permian to Triassic Solid Bitumen and Its Potential Source Rocks in NE Sichuan Basin

Nanoscale Pore Characteristics of the Upper Permian Mudrocks from a Transitional Environment in and around Eastern Sichuan Basin, China

Comparison of Formation Conditions of Source Rocks of Fengcheng and Lucaogou Formations in the Junggar Basin, NW China: Implications for Organic Matter Enrichment and Hydrocarbon Potential

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