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Natural Gas Geoscience ›› 2022, Vol. 33 ›› Issue (3): 431-440.doi: 10.11764/j.issn.1672-1926.2021.10.005

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Shale gas enrichment conditions and controlling factors of Upper Permian Longtan Formation transitional shale in Southeast Sichuan to Northwest Guizhou

Pengwei WANG1(),Guangxiang LIU1,Zhongbao LIU1,Xiao CHEN2,Peng LI1,Beibei CAI3   

  1. 1.Research Institute of Petroleum Exploration & Production，SINOPEC，Beijing 100083，China
    2.CNOOC International Limited，Beijing 100027，China
    3.China University of Geosciences （Beijing），Beijing 100083，China
  • Received:2021-08-24 Revised:2021-10-03 Online:2022-03-10 Published:2022-03-22
  • Supported by:
    The National Natural Science Foundation of China(91755211)

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Abstract:

Focusing on shale gas enrichment conditions of Upper Permian Longtan Formation transitional shale in Southeast Sichuan to Northwest Guizhou， this paper primarily discusses source rock quality， reservoir conditions and gas content by using measurements， e.g.， organic petrology， kerogen carbon isotope， X-ray diffractometer （XRD） and field emission scanning electron microscopy （FE-SEM）. Results show that the Longtan shale in Southeast Sichuan to Northwest Guizhou is characterized by high organic matter abundance （average TOC value is 3.50%） and high thermal maturity （average RO value is 2.23%）. The organic macerals are dominated by vitrinite， followed by inertinite， indicating type III kerogen. It is a set of high-quality gas source rocks. The shale reservoir has high physical properties with average porosity of 5.56%， the reservoir is dominated by clay mineral pores， where mesoporous and micropores among I/S mixed layers are well developed. Organic macerals are main controlling factors on the organic pore development in Longtan high to over-high organic-rich shale. Shale varies greatly in adsorbed gas content and total gas content， and the organic matter abundance is an important factor controlling adsorption capacity and gas content.

Key words: Shale gas, Source rock quality, Shale reservoir, Gas content, Primary controllers, Upper Permian, Longtan Formation, Southeast Sichuan to Northwest Guizhou

CLC Number: 

  • TE122

Fig.1

Sedimentary facies［12］（a）and stratigraphic column（b） of Upper Permian Longtan Formation Southeast Sichuan to Northwest Guizhou area"

Fig.2

Bulk mineral composition（a） and clay mineral composition（b） of Longtan Formation shale in Northwest Guizhou"

Fig.3

Histograms of measured TOC （a） and RO （b） of Longtan Formation shale in Southeast Sichuan to Northwest Guizhou"

Fig.4

TOC and RO distributions of Upper Permian Longtan Formation shale in Southeast Sichuan to Northwest Guizhou"

Fig.5

Macerals of Longtan Formation shale in Southeast Sichuan to Northwest Guizhou"

Fig.6

Comparison of carbon isotopes of kerogen from different formation shales"

Fig.7

Histogram of porosity （a） and pore size distribution （b） of Longtan Formation shale in Southeast Sichuan to Northwest Guizhou"

Fig.8

Pore types of Longtan Formation shale in Southeast Sichuan to Northwest Guizhou"

Fig.9

SEM images of organic matter from Longtan Formation shale in Southeast Sichuan to Northwest Guizhou"

Fig.10

Relationship between clay minerals （a）， TOC （b） and porosity of Longtan Formation shale"

Fig.11

Isothermal adsorption curves of Longtan Formation shale samples"

Fig.12

Relationship between TOC（a） clay mineral content and total gas content（b） of Longtan Formation shale"

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