Natural Gas Geoscience ›› 2021, Vol. 32 ›› Issue (9): 1384-1392.doi: 10.11764/j.issn.1672-1926.2021.04.004

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Biodegradation and geochemical conditions for hydrocarbon accumulation of Cretaceous reservoir in Mosuowan area of Junggar Basin

Erting LI1,2(),Julei MI1,2,Bo ZHOU1,2,Cong MA1,2,Shijia CHEN3,Xiaogang ZHANG1,2,Cuimin LIU1,2   

  1. 1.Xinjiang Laboratory of Petroleum Reserve in Conglomerate,Karamay 834000,China
    2.Research Institute of Experiment and Testing,Xinjiang Oilfield Company,PetroChina,Karamay 834000,China
    3.Resource and Environmental Engineering College,Southwest Petroleum University,Chengdu 610500,China
  • Received:2021-01-26 Revised:2021-03-30 Online:2021-09-10 Published:2021-09-14
  • Supported by:
    The Major Engineering Technology Field Test Project of CNPC(2019F-33)

Abstract:

Content of 25-norhopane, homogenization temperature and composition of fluid inclusions, stratigraphic burial-thermal history and characteristic of rock fluorescence are analyzed. Distribution, location and time of biodegradation of Cretaceous reservoir in Mosuowan area of Junggar Basin were discussed. Combined with biodegradable and undegraded crude oil mixing experiment, the scale of sub-reservoir preservation in different periods was revealed. The results show that there is widespread biodegradation in Cretaceous reservoir in Mosuowan area of Junggar Basin, and vertical distribution of biodegradation is controlled by unconformity at the bottom of Cretaceous reservoir. There are two stages of oil accumulation in Cretaceous reservoir. Early accumulation began in Early Cretaceous, accompanied by severe local biodegradation. The degradation time was from the end of Early Cretaceous to the early of Late Cretaceous. However, due to limitation of the scale of hydrocarbon expulsion from source rocks, first stage of oil accumulation is small, resulting in a small impact of biodegradation on later oil accumulation. Second stage of accumulation is the main accumulation period, and accumulation time corresponds to large-scale hydrocarbon expulsion period of source rocks of the lower Wuerhe Formation, that is, during Late Cretaceous.

Key words: Cretaceous, Biodegradation, Accumulation, Inclusions, 25-norhopane, Junggar Basin

CLC Number: 

  • TE122.1+13

Fig.1

Distribution map of oil and gas fields and well positions in the hinterland of Junggar Basin"

Fig.2

Cross plot of 25-norhopane/C29 hopane and depths of crude oil in the hinterland of Junggar Basin"

Fig.3

Mass spectrum of free, adsorbed and inclusion components from Cretaceous reservoirs of Well Lu29 in the hinterland of Junggar Basin"

Fig.4

Distribution map of homogenization temperature of fluid inclusions in Mosuowan area of Junggar Basin"

Table 1

Single well homogenization temperature characteristics of fluid inclusions from Cretaceous reservoir in Mosuowan area, Junggar Basin"

井号均一温度/℃均一温度均值/℃
盆参271~85,90~9778,94
盆467~84,85~11475,104
盆562.5~68,103.2~11265,107.5
莫395.5~97.2,112.5~118.996.4,115.7

Fig.5

Hydrocarbon generation evolution history of Permian source rocks in west sag of Well Pen-1, Junggar Basin"

Fig.6

Variation of 25-norhopane/C29 hopane in the mixed experiment of undegraded crude oil and biodegraded crude oil in Mosuowan area of Junggar Basin"

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