Reservoir characteristics and main controlling factors of the fourth member of Ordovician Majiagou Formation in the central and eastern Ordos Basin
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...
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| Format: | Article |
| Language: | zho |
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Editorial Office of Petroleum Geology and Experiment
2023-07-01
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| Series: | Shiyou shiyan dizhi |
| Subjects: | |
| Online Access: | https://www.sysydz.net/cn/article/doi/10.11781/sysydz202304780 |
| _version_ | 1797277424275161088 |
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| author | Chunguo MOU Jie XU Yonghong GU Jianpeng JIA Wenxiong WANG Xiucheng TAN |
| author_facet | Chunguo MOU Jie XU Yonghong GU Jianpeng JIA Wenxiong WANG Xiucheng TAN |
| author_sort | Chunguo MOU |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-07T15:48:14Z |
| format | Article |
| id | doaj.art-30732c4d75b74afba82f6db6e4932c9f |
| institution | Directory Open Access Journal |
| issn | 1001-6112 |
| language | zho |
| last_indexed | 2024-03-07T15:48:14Z |
| publishDate | 2023-07-01 |
| publisher | Editorial Office of Petroleum Geology and Experiment |
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| series | Shiyou shiyan dizhi |
| spelling | doaj.art-30732c4d75b74afba82f6db6e4932c9f2024-03-05T03:15:40ZzhoEditorial Office of Petroleum Geology and ExperimentShiyou shiyan dizhi1001-61122023-07-0145478079010.11781/sysydz202304780sysydz-45-4-780Reservoir characteristics and main controlling factors of the fourth member of Ordovician Majiagou Formation in the central and eastern Ordos BasinChunguo MOU0Jie XU1Yonghong GU2Jianpeng JIA3Wenxiong WANG4Xiucheng TAN5Oil and Gas Technology Research Institute, PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, ChinaOil and Gas Technology Research Institute, PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, ChinaExploration Division, PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, ChinaOil and Gas Technology Research Institute, PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, ChinaRecent 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.https://www.sysydz.net/cn/article/doi/10.11781/sysydz202304780reservoir characteristicsmain controlling factorsfourth member of majiagou formationordoviciancentral and eastern ordos basin |
| spellingShingle | Chunguo MOU Jie XU Yonghong GU Jianpeng JIA Wenxiong WANG Xiucheng TAN Reservoir characteristics and main controlling factors of the fourth member of Ordovician Majiagou Formation in the central and eastern Ordos Basin Shiyou shiyan dizhi reservoir characteristics main controlling factors fourth member of majiagou formation ordovician central and eastern ordos basin |
| title | Reservoir characteristics and main controlling factors of the fourth member of Ordovician Majiagou Formation in the central and eastern Ordos Basin |
| title_full | Reservoir characteristics and main controlling factors of the fourth member of Ordovician Majiagou Formation in the central and eastern Ordos Basin |
| title_fullStr | Reservoir characteristics and main controlling factors of the fourth member of Ordovician Majiagou Formation in the central and eastern Ordos Basin |
| title_full_unstemmed | Reservoir characteristics and main controlling factors of the fourth member of Ordovician Majiagou Formation in the central and eastern Ordos Basin |
| title_short | Reservoir characteristics and main controlling factors of the fourth member of Ordovician Majiagou Formation in the central and eastern Ordos Basin |
| title_sort | reservoir characteristics and main controlling factors of the fourth member of ordovician majiagou formation in the central and eastern ordos basin |
| topic | reservoir characteristics main controlling factors fourth member of majiagou formation ordovician central and eastern ordos basin |
| url | https://www.sysydz.net/cn/article/doi/10.11781/sysydz202304780 |
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