Evaluation of reservoir environment by chemical properties of reservoir water‒A case study of Chang 6 reservoir in Ansai oilfield, Ordos Basin, China
ABSTRACT: The Ordos Basin is the largest continental multi-energy mineral basin in China, which is rich in coal, oil and gas, and uranium resources. The exploitation of mineral resources is closely related to reservoir water. The chemical properties of reservoir water are very important for reservoi...
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KeAi Communications Co., Ltd.
2023-07-01
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| Series: | China Geology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2096519223014477 |
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| author | Zhi-bo Zhang Ying Xu Di-fei Zhao Hao-ming Liu Wei-cheng Jiang Dan-ling Chen Teng-rui Jin |
| author_facet | Zhi-bo Zhang Ying Xu Di-fei Zhao Hao-ming Liu Wei-cheng Jiang Dan-ling Chen Teng-rui Jin |
| author_sort | Zhi-bo Zhang |
| collection | DOAJ |
| description | ABSTRACT: The Ordos Basin is the largest continental multi-energy mineral basin in China, which is rich in coal, oil and gas, and uranium resources. The exploitation of mineral resources is closely related to reservoir water. The chemical properties of reservoir water are very important for reservoir evaluation and are significant indicators of the sealing of reservoir oil and gas resources. Therefore, the caprock of the Chang 6 reservoir in the Yanchang Formation was evaluated. The authors tested and analyzed the chemical characteristics of water samples selected from 30 wells in the Chang 6 reservoir of Ansai Oilfield in the Ordos Basin. The results show that the Chang 6 reservoir water in Ansai Oilfield is dominated by calcium-chloride water type with a sodium chloride coefficient of generally less than 0.5. The chloride magnesium coefficients are between 33.7 and 925.5, most of which are greater than 200. The desulfurization coefficients range from 0.21 to 13.4, with an average of 2.227. The carbonate balance coefficients are mainly concentrated below 0.01, with an average of 0.008. The calcium and magnesium coefficients are between 0.08 and 0.003, with an average of 0.01. Combined with the characteristics of the four-corner layout of the reservoir water, the above results show that the graphics are basically consistent. The study indicates that the Chang 6 reservoir in Ansai Oilfield in the Ordos Basin is a favorable block for oil and gas storage with good sealing properties, great preservation conditions of oil and gas, and high pore connectivity.©2023 China Geology Editorial Office. |
| format | Article |
| id | doaj-art-4c0c03670c2e4a30a8e4ce70d2d46ce6 |
| institution | Matheson Library |
| issn | 2589-9430 |
| language | English |
| publishDate | 2023-07-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | China Geology |
| spelling | doaj-art-4c0c03670c2e4a30a8e4ce70d2d46ce62025-07-02T04:49:55ZengKeAi Communications Co., Ltd.China Geology2589-94302023-07-0163443454Evaluation of reservoir environment by chemical properties of reservoir water‒A case study of Chang 6 reservoir in Ansai oilfield, Ordos Basin, ChinaZhi-bo Zhang0Ying Xu1Di-fei Zhao2Hao-ming Liu3Wei-cheng Jiang4Dan-ling Chen5Teng-rui Jin6School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China; First author: E-mail address: zzb397132190@126.com (Zhi-bo Zhang).Geophysical Research Institute of Jiangsu Oilfield Company, SINOPEC, Nanjing 210046, ChinaArtificial Intelligence Research Institute, China University of Mining and Technology, Xuzhou 221116, China; Corresponding author: E-mail address: difei.zhao@cumt.edu.cn (Di-fei Zhao).Xingzichuan Oil Recovery Plant of Yanchang Oil Field, Yanan 717400, ChinaDepartment of Earth and Environmental Sciences, Macquarie University, Sydney, NSW 2109, AustraliaDepartment of Land Management, College of Public Administration, Huazhong Agricultural University, Wuhan 430070, ChinaResearch Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay 834000, ChinaABSTRACT: The Ordos Basin is the largest continental multi-energy mineral basin in China, which is rich in coal, oil and gas, and uranium resources. The exploitation of mineral resources is closely related to reservoir water. The chemical properties of reservoir water are very important for reservoir evaluation and are significant indicators of the sealing of reservoir oil and gas resources. Therefore, the caprock of the Chang 6 reservoir in the Yanchang Formation was evaluated. The authors tested and analyzed the chemical characteristics of water samples selected from 30 wells in the Chang 6 reservoir of Ansai Oilfield in the Ordos Basin. The results show that the Chang 6 reservoir water in Ansai Oilfield is dominated by calcium-chloride water type with a sodium chloride coefficient of generally less than 0.5. The chloride magnesium coefficients are between 33.7 and 925.5, most of which are greater than 200. The desulfurization coefficients range from 0.21 to 13.4, with an average of 2.227. The carbonate balance coefficients are mainly concentrated below 0.01, with an average of 0.008. The calcium and magnesium coefficients are between 0.08 and 0.003, with an average of 0.01. Combined with the characteristics of the four-corner layout of the reservoir water, the above results show that the graphics are basically consistent. The study indicates that the Chang 6 reservoir in Ansai Oilfield in the Ordos Basin is a favorable block for oil and gas storage with good sealing properties, great preservation conditions of oil and gas, and high pore connectivity.©2023 China Geology Editorial Office.http://www.sciencedirect.com/science/article/pii/S2096519223014477Oil and gasReservoir waterSalinityCalcium-chloride waterCarbonate balance coefficientOil-bearing reservoir prediction |
| spellingShingle | Zhi-bo Zhang Ying Xu Di-fei Zhao Hao-ming Liu Wei-cheng Jiang Dan-ling Chen Teng-rui Jin Evaluation of reservoir environment by chemical properties of reservoir water‒A case study of Chang 6 reservoir in Ansai oilfield, Ordos Basin, China China Geology Oil and gas Reservoir water Salinity Calcium-chloride water Carbonate balance coefficient Oil-bearing reservoir prediction |
| title | Evaluation of reservoir environment by chemical properties of reservoir water‒A case study of Chang 6 reservoir in Ansai oilfield, Ordos Basin, China |
| title_full | Evaluation of reservoir environment by chemical properties of reservoir water‒A case study of Chang 6 reservoir in Ansai oilfield, Ordos Basin, China |
| title_fullStr | Evaluation of reservoir environment by chemical properties of reservoir water‒A case study of Chang 6 reservoir in Ansai oilfield, Ordos Basin, China |
| title_full_unstemmed | Evaluation of reservoir environment by chemical properties of reservoir water‒A case study of Chang 6 reservoir in Ansai oilfield, Ordos Basin, China |
| title_short | Evaluation of reservoir environment by chemical properties of reservoir water‒A case study of Chang 6 reservoir in Ansai oilfield, Ordos Basin, China |
| title_sort | evaluation of reservoir environment by chemical properties of reservoir water a case study of chang 6 reservoir in ansai oilfield ordos basin china |
| topic | Oil and gas Reservoir water Salinity Calcium-chloride water Carbonate balance coefficient Oil-bearing reservoir prediction |
| url | http://www.sciencedirect.com/science/article/pii/S2096519223014477 |
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