Reservoir characteristics and main controlling factors of the fourth member of Ordovician Majiagou Formation in the central and eastern Ordos Basin

MOU Chunguo; XU Jie; GU Yonghong; JIA Jianpeng; WANG Wenxiong; TAN Xiucheng

doi:10.11781/sysydz202304780

Volume 45 Issue 4

Jul. 2023

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MOU Chunguo, XU Jie, GU Yonghong, JIA Jianpeng, WANG Wenxiong, TAN Xiucheng. Reservoir characteristics and main controlling factors of the fourth member of Ordovician Majiagou Formation in the central and eastern Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(4): 780-790. doi: 10.11781/sysydz202304780

Citation:

MOU Chunguo, XU Jie, GU Yonghong, JIA Jianpeng, WANG Wenxiong, TAN Xiucheng. Reservoir characteristics and main controlling factors of the fourth member of Ordovician Majiagou Formation in the central and eastern Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(4): 780-790. doi: 10.11781/sysydz202304780

Citation:

MOU Chunguo, XU Jie, GU Yonghong, JIA Jianpeng, WANG Wenxiong, TAN Xiucheng. Reservoir characteristics and main controlling factors of the fourth member of Ordovician Majiagou Formation in the central and eastern Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(4): 780-790. doi: 10.11781/sysydz202304780

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Reservoir characteristics and main controlling factors of the fourth member of Ordovician Majiagou Formation in the central and eastern Ordos Basin

doi: 10.11781/sysydz202304780

MOU Chunguo^{1, 2
,},
XU Jie^{3, 4},
GU Yonghong^{1, 2},
JIA Jianpeng⁵,
WANG Wenxiong^{1, 2},
TAN Xiucheng^{3, 4
,
,}

1.
Oil and Gas Technology Research Institute, PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, China
2.
National Engineering Laboratory for Low Permeability Oil and Gas Field Exploration and Development, Xi'an, Shaanxi 710018, China
3.
State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
4.
Research Branch of Southwest Petroleum University, Key Laboratory of Carbonate Reservoirs of China National Petroleum Corporation, Chengdu, Sichuan 610500, China
5.
Exploration Division, PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, China

Received Date: 2022-11-23
Rev Recd Date: 2023-05-01
Publish Date: 2023-07-28

Abstract

Abstract

Recent exploration practice shows that the leopard porphyry dolomite reservoir in the fourth member of Ordovician Majiagou Formation in the central and eastern Ordos Basin has good exploration and development potential. Therefore, based on drilling cores, rock slices and analysis and laboratory data, the reservoir characteristics and main controlling factors of this section were analyzed. The results show that: (1) The reservoir rocks of the fourth member of Majiagou Formation mainly include leopard porphyry dolomitic limestone, leopard porphyry limy dolomite, crystalline dolomite and clotted dolomite, and the reservoir space types mainly consist of intergranular (dissolution) pores, with a small amount of lattice pores and microcracks. (2) The reservoir in the study area is generally characte-rized by low porosity and medium-low permeability pore type reservoir, in which leopard porphyry limestone dolomite and crystalline dolomite are the best reservoir rocks with wide distribution range. However, leopard porphyry dolomitic limestone is developed on a large scale, with poor reservoir performance as a whole, while clotted dolomite has good reservoir performance, but its development frequency is low. The reservoir development in the fourth member of Majiagou Formation in the central and eastern Ordos Basin is mainly controlled by sedimentary microfacies, bioturbation, dolomitization and early diagenetic karstification: as the material basis for reservoir formation, favorable sedimentary microfacies control the horizontal distribution of reservoirs; bioturbation is for dolomitization; dolomitization is the key to reservoir formation, which is conducive to the preservation of reservoir pores; early diagenetic karstification has an important contribution to the improvement of reservoir quality. In the longitudinal, the favorable reservoirs in the fourth member of Majiagou Formation are mainly located in the middle-upper part of the high-frequency upward shallowing sequence; on the plane, the favorable reservoirs are mainly concentrated in the line of Wushen Banner-Jingbian-Zhidan in the west and the two relatively independent areas of Shenmu and Mizhi in the east of the study area.
- reservoir characteristics,
- main controlling factors,
- fourth member of Majiagou Formation,
- Ordovician,
- central and eastern Ordos Basin

All authors disclose no relevant conflict of interests.
The study of reservoir characteristics was carried out by MOU Chunguo and XU Jie. The reservoir genesis and main controlling factors were analyzed by GU Yonghong and JIA Jianpeng. The distribution of favorable reservoirs was predicted by WANG Wenxiong and TAN Xiucheng. The manuscript was drafted and revised by MOU Chunguo, XU Jie, and GU Yonghong. All the authors have read the last version of paper and consented for submission.

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References(23)

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Reservoir characteristics and main controlling factors of the fourth member of Ordovician Majiagou Formation in the central and eastern Ordos Basin

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Reservoir characteristics and main controlling factors of the fourth member of Ordovician Majiagou Formation in the central and eastern Ordos Basin

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