China Petroleum Exploration ›› 2021, Vol. 26 ›› Issue (4): 99-112.DOI: 10.3969/j.issn.1672-7703.2021.04.008

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New understandings of stratigraphic division and correlation of Jiamuhe Formation and natural gas exploration target in Mahu Sag and its periphery, Junggar Basin

Wang Tao1,Menglin1,Ren Haijiao1,Li Ting11,Wu Haisheng1,Wang Xulong2,Zhang Yueqian2, Chang Qiusheng1,Li Yongjun3,Wang Xiatian1   

  1. 1 Research Institute of Exploration & Development, PetroChina Xinjiang Oilfield Company; 2 PetroChina Xinjiang Oilfield Company; 3 Chang’an University
  • Online:2021-07-15 Published:2021-07-15

Abstract: Jiamuhe Formation is one of the major targets for natural gas exploration in Mahu Sag and its periphery in Junggar Basin. Therefore, the study of stratigraphic division and correlation of Jiamuhe Formation is of guiding signifi cance to the selection of exploration zones and plays in this area. However, the correlation method in previous studies is unclear and the replacement area for natural gas exploration is not known. In this paper, multiple stratigraphic study methods are used to synthetically correlate the characteristics of outcrop, downhole and seismic data, and natural gas geochemical data are combined, so as to determine the stratigraphic division and correlation scheme of Jiamuhe Formation and natural gas exploration target. The study result shows that the Jiamuhe Formation is developed in the Early Permian, with lithology association of “clastic rocks in the lower part and volcanic rocks in the upper part”. The stratum is thinner from northern Mahu Sag towards Zhongguai area; In Manan-Zhongguai area, part of the well section which was regarded as Jiamuhe Formation is classifi ed into the Upper Carboniferous; Jiamuhe Formation in northern Mahu Sag has natural gas generation capability, where the deep-seated reservoir is favorable target for natural gas exploration. The structural-lithologic traps in Jiamuhe Formation-Carboniferous have promising potential of “self-generation and self-storage” and “upper-generation and lower storage” types natural gas reservoirs.

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