Study on the Origin and Fluid Identification of Low-Resistance Gas Reservoirs
The Wu 2 section of the Ke017 well block is a low-resistance gas reservoir with ultralow porosity and low permeability. The comprehensive analysis of rock lithology, physical properties, sedimentary characteristics, and gas content demonstrated that the development of micropores in illite/smectite d...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2020/8859309 |
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| author | Zhou Yuhui Hu Qingxiong Liu Wentao Wu Zhiqi Yan Yule Ma Jialing |
| author_facet | Zhou Yuhui Hu Qingxiong Liu Wentao Wu Zhiqi Yan Yule Ma Jialing |
| author_sort | Zhou Yuhui |
| collection | DOAJ |
| description | The Wu 2 section of the Ke017 well block is a low-resistance gas reservoir with ultralow porosity and low permeability. The comprehensive analysis of rock lithology, physical properties, sedimentary characteristics, and gas content demonstrated that the development of micropores in illite/smectite dominated clay minerals together with the resulted additional conductivity capability and complex reservoir pore structures, as well as the enrichment of self-generating conductivity minerals like zeolites and pyrite which were the formation mechanisms of low-resistance gas layers in the Wu 2 section. A low-resistance gas reservoir has poor physical property, and it is difficult to distinguish the oil layer from the dry, gas, or water layers. In this paper, based on well/mud logging data and laboratory data, by taking advantages of the “excavation effect” of neutron gas and the dual-lateral resistivity difference between different depths, we successfully established a set of low-contrast log response methods for the identification and evaluation of oil layer and formation fluids. For a gas layer, the difference between neutron porosity and acoustic (or density) porosity is smaller than 0 and the difference in dual-lateral resistivity is greater than 0. For a water layer, the neutron porosity is similar to the acoustic (or density) porosity and the dual-lateral resistivity difference will be less than 0. While for a dry layer or a layer with both gas and water, the difference in porosity as well as dual-lateral resistivity is very small. The proposed method effectively solves the technical problem of oil layer and formation fluid identification in low-resistance gas reservoirs. |
| format | Article |
| id | doaj-art-32af6a0b021e4fe0919d6e8b5ab3ff9a |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-32af6a0b021e4fe0919d6e8b5ab3ff9a2025-02-03T05:49:50ZengWileyGeofluids1468-81151468-81232020-01-01202010.1155/2020/88593098859309Study on the Origin and Fluid Identification of Low-Resistance Gas ReservoirsZhou Yuhui0Hu Qingxiong1Liu Wentao2Wu Zhiqi3Yan Yule4Ma Jialing5Yangtze University, Wuhan, Hubei, 430100, ChinaThe No.1 Oil Production Plant, PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang, 834000, ChinaResearch Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang, 834000, ChinaHeavy Oil Company, PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang, 834000, ChinaNational Coal Chemical Product Quality Supervision and Inspection Center, Huainan, Anhui, 232001, ChinaYangtze University, Wuhan, Hubei, 430100, ChinaThe Wu 2 section of the Ke017 well block is a low-resistance gas reservoir with ultralow porosity and low permeability. The comprehensive analysis of rock lithology, physical properties, sedimentary characteristics, and gas content demonstrated that the development of micropores in illite/smectite dominated clay minerals together with the resulted additional conductivity capability and complex reservoir pore structures, as well as the enrichment of self-generating conductivity minerals like zeolites and pyrite which were the formation mechanisms of low-resistance gas layers in the Wu 2 section. A low-resistance gas reservoir has poor physical property, and it is difficult to distinguish the oil layer from the dry, gas, or water layers. In this paper, based on well/mud logging data and laboratory data, by taking advantages of the “excavation effect” of neutron gas and the dual-lateral resistivity difference between different depths, we successfully established a set of low-contrast log response methods for the identification and evaluation of oil layer and formation fluids. For a gas layer, the difference between neutron porosity and acoustic (or density) porosity is smaller than 0 and the difference in dual-lateral resistivity is greater than 0. For a water layer, the neutron porosity is similar to the acoustic (or density) porosity and the dual-lateral resistivity difference will be less than 0. While for a dry layer or a layer with both gas and water, the difference in porosity as well as dual-lateral resistivity is very small. The proposed method effectively solves the technical problem of oil layer and formation fluid identification in low-resistance gas reservoirs.http://dx.doi.org/10.1155/2020/8859309 |
| spellingShingle | Zhou Yuhui Hu Qingxiong Liu Wentao Wu Zhiqi Yan Yule Ma Jialing Study on the Origin and Fluid Identification of Low-Resistance Gas Reservoirs Geofluids |
| title | Study on the Origin and Fluid Identification of Low-Resistance Gas Reservoirs |
| title_full | Study on the Origin and Fluid Identification of Low-Resistance Gas Reservoirs |
| title_fullStr | Study on the Origin and Fluid Identification of Low-Resistance Gas Reservoirs |
| title_full_unstemmed | Study on the Origin and Fluid Identification of Low-Resistance Gas Reservoirs |
| title_short | Study on the Origin and Fluid Identification of Low-Resistance Gas Reservoirs |
| title_sort | study on the origin and fluid identification of low resistance gas reservoirs |
| url | http://dx.doi.org/10.1155/2020/8859309 |
| work_keys_str_mv | AT zhouyuhui studyontheoriginandfluididentificationoflowresistancegasreservoirs AT huqingxiong studyontheoriginandfluididentificationoflowresistancegasreservoirs AT liuwentao studyontheoriginandfluididentificationoflowresistancegasreservoirs AT wuzhiqi studyontheoriginandfluididentificationoflowresistancegasreservoirs AT yanyule studyontheoriginandfluididentificationoflowresistancegasreservoirs AT majialing studyontheoriginandfluididentificationoflowresistancegasreservoirs |