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Article Navigation >  Acta Sedimentologica Sinica  > 2018  >  36(1): 166-175

LI ShuTong, SHI ZiWei, MOU WeiWei, LUO AnXiang, WANG Qi, DENG XiuQin, ZHANG WenXuan, LI Yang, YAN CanCan. Diversity of the Triassic Chang 81 Low Permeability Reservoirs in Jiyuan and Xifeng Area, Ordos Basin[J]. Acta Sedimentologica Sinica, 2018, 36(1): 166-175. doi: 10.3969/j.issn.1000-0550.2018.018
Citation: LI ShuTong, SHI ZiWei, MOU WeiWei, LUO AnXiang, WANG Qi, DENG XiuQin, ZHANG WenXuan, LI Yang, YAN CanCan. Diversity of the Triassic Chang 81 Low Permeability Reservoirs in Jiyuan and Xifeng Area, Ordos Basin[J]. Acta Sedimentologica Sinica, 2018, 36(1): 166-175. doi: 10.3969/j.issn.1000-0550.2018.018
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Diversity of the Triassic Chang 81 Low Permeability Reservoirs in Jiyuan and Xifeng Area, Ordos Basin

doi: 10.3969/j.issn.1000-0550.2018.018
  • 1.

    Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China;

  • 2.

    Exploration and Development Research Institution, Changqing Oilfield Company, Xi'an 710021, China;

  • 3.

    University of Chinese Academy of Sciences, Beijing 100049, China

Funds:  National Natural Science Foundation of China, No.41772142;Science and Technology Foundation of Lanzhou Center for Oil and Gas Resources Research during the "13th Five-Year Plan", No.135CCJJ20160510, Youth Innovation Promotion Association CAS, No. Y410ST1LST
  • Received Date: 2016-07-27
  • Rev Recd Date: 2017-01-04
  • Publish Date: 2018-02-10
  • Using the data of drilling cores, thin sections and well loggings, focused on the reservoir characteristics and pore evolution, this paper gives a comparative analysis about the diversity of the Triassic Chang 81 low permeability reservoirs in Jiyuan and Xifeng area. On the one hand, the commonalities of Chang 81 reservoirs in both areas are:1) Reservoir sand bodies are underwater distributary channel sands of shallow water delta front, which are thick sand bodies of multiphase superposition with great continuity on the space. 2) The sandstones are lithic arkose and feldspathic litharenite and belong to fine sandstones and very fine sandstones with good sorting in both areas. 3) Reservoir porosity is mainly composed of primary pores and dissolution pores. The original porosity is around 38% in the study area. The loss of primary pores accounts for about 35% because of compaction and cementation. The final reservoir porosity is 7%. On the other hand, the differences of Chang 81 reservoirs in both areas are:1) The underwater distributary channel sands of Chang 81 in Jiyuan area hold the unobvious superposition and belong to "continuous retrogradation" depositional model. In contrast, the sands in Xifeng area have the obvious vertical accretion and belong to "see-saw" depositional model. 2) The intergranular pores, lithic dissolved pores and intracrystalline pores in Jiyuan area are inferior to Xifeng area. However, the dissolved pores in Jiyuan area are superior to Xifeng area. 3) In the late diagenetic evolution stages of reservoirs, the average cementation porosity loss ratio of Chang 81 sands accounts for about 13.87% and 11.99% in Jiyuan and Xifeng area, respectively. The degree of cementation pores loss in Jiyuan area is higher than Xifeng area. In addition, the dissolution pores increase ratio accounts for about 3.71% and 2.79% in Jiyuan and Xifeng area, respectively. The Jiyuan area is superior to Xifeng area.
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Publishing history
  • Received:  2016-07-27
  • Revised:  2017-01-04
  • Published:  2018-02-10

Diversity of the Triassic Chang 81 Low Permeability Reservoirs in Jiyuan and Xifeng Area, Ordos Basin

doi: 10.3969/j.issn.1000-0550.2018.018
  • 1. Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China;
  • 2. Exploration and Development Research Institution, Changqing Oilfield Company, Xi'an 710021, China;
  • 3. University of Chinese Academy of Sciences, Beijing 100049, China
Funds:  National Natural Science Foundation of China, No.41772142;Science and Technology Foundation of Lanzhou Center for Oil and Gas Resources Research during the "13th Five-Year Plan", No.135CCJJ20160510, Youth Innovation Promotion Association CAS, No. Y410ST1LST
  • Received Date: 2016-07-27
  • Rev Recd Date: 2017-01-04
  • Publish Date: 2018-02-10

Abstract: Using the data of drilling cores, thin sections and well loggings, focused on the reservoir characteristics and pore evolution, this paper gives a comparative analysis about the diversity of the Triassic Chang 81 low permeability reservoirs in Jiyuan and Xifeng area. On the one hand, the commonalities of Chang 81 reservoirs in both areas are:1) Reservoir sand bodies are underwater distributary channel sands of shallow water delta front, which are thick sand bodies of multiphase superposition with great continuity on the space. 2) The sandstones are lithic arkose and feldspathic litharenite and belong to fine sandstones and very fine sandstones with good sorting in both areas. 3) Reservoir porosity is mainly composed of primary pores and dissolution pores. The original porosity is around 38% in the study area. The loss of primary pores accounts for about 35% because of compaction and cementation. The final reservoir porosity is 7%. On the other hand, the differences of Chang 81 reservoirs in both areas are:1) The underwater distributary channel sands of Chang 81 in Jiyuan area hold the unobvious superposition and belong to "continuous retrogradation" depositional model. In contrast, the sands in Xifeng area have the obvious vertical accretion and belong to "see-saw" depositional model. 2) The intergranular pores, lithic dissolved pores and intracrystalline pores in Jiyuan area are inferior to Xifeng area. However, the dissolved pores in Jiyuan area are superior to Xifeng area. 3) In the late diagenetic evolution stages of reservoirs, the average cementation porosity loss ratio of Chang 81 sands accounts for about 13.87% and 11.99% in Jiyuan and Xifeng area, respectively. The degree of cementation pores loss in Jiyuan area is higher than Xifeng area. In addition, the dissolution pores increase ratio accounts for about 3.71% and 2.79% in Jiyuan and Xifeng area, respectively. The Jiyuan area is superior to Xifeng area.

LI ShuTong, SHI ZiWei, MOU WeiWei, LUO AnXiang, WANG Qi, DENG XiuQin, ZHANG WenXuan, LI Yang, YAN CanCan. Diversity of the Triassic Chang 81 Low Permeability Reservoirs in Jiyuan and Xifeng Area, Ordos Basin[J]. Acta Sedimentologica Sinica, 2018, 36(1): 166-175. doi: 10.3969/j.issn.1000-0550.2018.018
Citation: LI ShuTong, SHI ZiWei, MOU WeiWei, LUO AnXiang, WANG Qi, DENG XiuQin, ZHANG WenXuan, LI Yang, YAN CanCan. Diversity of the Triassic Chang 81 Low Permeability Reservoirs in Jiyuan and Xifeng Area, Ordos Basin[J]. Acta Sedimentologica Sinica, 2018, 36(1): 166-175. doi: 10.3969/j.issn.1000-0550.2018.018
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