Trace element characterization of bitumen constraints on the hydrocarbon source of the giant gas field in Sichuan Basin, South China

The exploration of high production, natural gas wells (>106 m3/d) has been extremely successful in the Gaoshiti and Moxi areas of the Leshan–Longnvsi paleo‐uplift, in the west‐central Sichuan Basin. This paper focuses on the Sinian and Cambrian reservoirs from the Gaoshiti and Moxi areas, where a...

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Bibliographic Details
Published in:Geological journal (Chichester, England) England), 2020-01, Vol.55 (1), p.317-329
Main Authors: Ni, Zhiyong, Chen, Zhonghong, Li, Meijun, Yang, Chengyu, Wen, Long, Hong, Haitao, Luo, Bing, Chen, Z.
Format: Article
Language:English
Subjects:
bitumen
Bitumens
Cambrian
Gas wells
Hydrocarbons
hydrocarbon‐source correlation
Leshan–Longnvsi paleo‐uplift
Natural gas
Natural gas exploration
Oil and gas exploration
Oil and gas fields
Oil exploration
Oil wells
Oxidoreductions
Petroleum
Petroleum hydrocarbons
Ratios
Reservoirs
Rock
Rocks
Sichuan Basin
Trace elements
Uplift
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Summary:The exploration of high production, natural gas wells (>106 m3/d) has been extremely successful in the Gaoshiti and Moxi areas of the Leshan–Longnvsi paleo‐uplift, in the west‐central Sichuan Basin. This paper focuses on the Sinian and Cambrian reservoirs from the Gaoshiti and Moxi areas, where a dataset of new trace elements in bitumen and potential source rock is reported and where hydrocarbon‐source correlation is attempted based on trace elements characteristics of the 12 potential source rocks and 22 bitumen samples. Results show that the bitumen from the three reservoirs can be distinguished from each other using trace element distribution patterns and redox‐ and provenance‐sensitive elemental ratios. Bitumen in the second and fourth members of the Sinian Dengying Formation were derived primarily from the third member of the source rocks of the Dengying Formation, which represents a self‐sourced paleo‐petroleum system. In contrast, bitumen in the reservoirs of the Cambrian Longwangmiao Formation is derived from the Cambrian Qiongzhusi Formation and third member of Dengying Formation. The trace element method used in this study improves our understanding of the complex hydrocarbon–source relation and confirm the potential target for petroleum exploration in the study area.
ISSN:0072-1050
1099-1034
DOI:10.1002/gj.3412