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Natural Gas Geoscience ›› 2020, Vol. 31 ›› Issue (3): 428-435.doi: 10.11764/j.issn.1672-1926.2019.12.005

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Geochemistry and accumulation model of Ordovician hydrocarbon in Sichuan Basin

Dian-wei ZHANG1(),Zhi-liang HE1,Gan-lu LI1,2   

  1. 1.SINOPEC Exploration and Production Research Institute, Beijing 100083, China
    2.College of Geosciences, China University of Petroleum, Beijing 102249, China
  • Received:2019-11-07 Revised:2019-12-09 Online:2020-03-10 Published:2020-03-26
  • Supported by:
    The Category A of Strategic Pilot Science and Technology of the Chinese Academy of Sciences(XDA14010406)

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Abstract:

Oil and gas discoveries of Ordovician in Sichuan Basin are mainly concentrated in the compact limestone of Nanjinguan Formation at the bottom of Ordovician and Baota Formation at the top of Ordovician, which is characterized by fractured hydrocarbon. It is difficult to obtain samples and to study the reservoir-forming condition furtherly. Recently, oil seepage has been obtained from Ordovician rock samples, which provides important evidences for the further study of Ordovician reservoir-forming conditions. Through the analysis of liquid oil seepage found in bioclastic limestone of Ordovician Baota Formation in Maobahe section of northern Sichuan Basin, saturated hydrocarbon chromatography, characteristic analysis of inclusions and carbon isotope analysis have been comprehensively applied. By comparing the Ordovician reservoir-forming conditions of Well Heshen-1 in northern Sichuan, paleo-uplift in central Sichuan and Well Dongshen-1 in southeastern Sichuan, it is clear that the hydrocarbon of Baota Formation in northern and southeastern Sichuan originated from the overlying source rocks of Wufeng Formation and Longmaxi Formation, which have the mode of generating in the underlying formation and storing in the overlying strata. Ordovician hydrocarbon, situated in paleo-uplift in central Sichuan mainly, receives hydrocarbon from the underlying Cambrian source rocks, forming a mode of generating in the overlying formation and storing in the underlying strata. These conclusions would provide a reference for Ordovician hydrocarbon exploration prospects.

Key words: Ordovician, Geochemical characteristics, Accumulation model, Hydrocarbon sources

CLC Number: 

  • TE122.1

Table 1

Tables of typical Ordovician gas producing wells in Sichuan Basin"

气田/构造井号层位井段/m产气量/(104 m3/d)
东山东深1井O2b3 499.5~3 55021.97
O2b3 496.7~3 523.7
河湾场河深1井O2b4 558~4 5801.88
O2b4 557
龙女寺—磨溪磨深1井O1t4 378~4 3954.22

Fig.1

Light oil and asphalt of Baota Formation and their microscopic characteristics"

Fig.2

Statistical histogram and burial history of fluid inclusions in bioclastic limestone of Ordovician Baota Formation"

Fig.3

Saturated hydrocarbon chromatogram of limestone extracts from Baota Formation of Maoba River"

Table 2

Characteristic parameters of saturated hydrocarbons in limestone extracts from Baota Formation of Maoba River"

主峰碳奇偶优势姥鲛烷/正十七烷植烷/正十八烷姥鲛烷/植烷
OEPPr/C17Ph/C18Pr/Ph
C151.070.390.391.12

Fig.4

Saturated hydrocarbon mass spectrogram of limestone extracts from Baota Formation of Maoba River"

Fig.5

Saturated hydrocarbon mass spectrogram of limestone extracts from Longmaxi Formation of Nanjiang"

Fig.6

Diagram of relationship between gas δ13C2 and δ13C2?δ13C1 in central Sichuan"

Fig.7

Typical oil and gas accumulation pattern of Ordovician in Sichuan Basin"

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