Classification and Evaluation on Shale Gas Reservoir for Wufeng-Longmaxi Formation in Chuannan Area, Sichuan Basin
AbstractBased on the comprehensive statistic and analysis on some representative geological and physical data, the classification criteria on net pay for shale gas reservoir of the Wufeng-Longmaxi formation in Shunan area, Sichuan Basin, are proposed, which include porosity (φ), gas...
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| Format: | Article |
| Language: | English |
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GeoScienceWorld
2021-06-01
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| Series: | Lithosphere |
| Online Access: | https://pubs.geoscienceworld.org/lithosphere/article/2021/Special%201/3364731/600850/Classification-and-Evaluation-on-Shale-Gas |
| _version_ | 1811237251086024704 |
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| author | Jianlin Guo Chengye Jia Dongbo He Fankun Meng |
| author_facet | Jianlin Guo Chengye Jia Dongbo He Fankun Meng |
| author_sort | Jianlin Guo |
| collection | DOAJ |
| description |
AbstractBased on the comprehensive statistic and analysis on some representative geological and physical data, the classification criteria on net pay for shale gas reservoir of the Wufeng-Longmaxi formation in Shunan area, Sichuan Basin, are proposed, which include porosity (φ), gas saturation (Sg), density of rock (DEN), brittleness index (BI), and gas content (Vt). When the porosity, gas saturation, brittleness index, and gas content are larger than 3%, 30%, 40%, and 1 m3/t, respectively, and the density of rock is lower than 2.7 g/cm3, then this formation can be seen as the net pay. The application of two key parameters, gas content and brittleness index, could reflect the reservoir resource basis and fracability, respectively. The gas content has a positive correlation with porosity and total organic volume, and the brittleness index has a positive correlation with siliceous and carbonate content. According to the range of these two parameters, the net pay can be classified into three types. For type I, the gas content and brittleness index are larger than 4 m3/t and 50%, respectively. For type II, either the gas content or the brittleness index is lower than 4 m3/t and 50%. For type III, the gas content should be larger than 1 m3/t and lower than 4 m3/t, and the brittleness index is between 40% and 50%. The field application case indicates that the Wufeng formation and low member of the Longmaxi formation have good quality and mainly consist of type I and II formations. In addition, it is found that there is a positive correlation between the penetration ratio for type I formation and the testing production and estimate ultimate recovery (EUR). While this ratio is larger than 50%, the testing production rate and EUR will be over 15×104 m3/d and 8000×104 m3 with a probability of 92%, which meet the requirement of exploitation with reasonable economic benefits. |
| first_indexed | 2024-04-12T12:21:04Z |
| format | Article |
| id | doaj.art-83f536994d784eb7a44ea148ec17e396 |
| institution | Directory Open Access Journal |
| issn | 1941-8264 1947-4253 |
| language | English |
| last_indexed | 2024-04-12T12:21:04Z |
| publishDate | 2021-06-01 |
| publisher | GeoScienceWorld |
| record_format | Article |
| series | Lithosphere |
| spelling | doaj.art-83f536994d784eb7a44ea148ec17e3962022-12-22T03:33:17ZengGeoScienceWorldLithosphere1941-82641947-42532021-06-012021Special 110.2113/2021/3364731Classification and Evaluation on Shale Gas Reservoir for Wufeng-Longmaxi Formation in Chuannan Area, Sichuan BasinJianlin Guo0Chengye Jia1Dongbo He2Fankun Meng3http://orcid.org/0000-0002-2023-1581PetroChina Research Institute of Petroleum Exploration & Development Beijing 100083 China petrochina.comPetroChina Research Institute of Petroleum Exploration & Development Beijing 100083 China petrochina.comPetroChina Research Institute of Petroleum Exploration & Development Beijing 100083 China petrochina.comCooperative Innovation Center of Unconventional Oil and Gas (Ministry of Education & Hubei Province) Yangtze University Wuhan 430100 China yangtzeu.edu.cn AbstractBased on the comprehensive statistic and analysis on some representative geological and physical data, the classification criteria on net pay for shale gas reservoir of the Wufeng-Longmaxi formation in Shunan area, Sichuan Basin, are proposed, which include porosity (φ), gas saturation (Sg), density of rock (DEN), brittleness index (BI), and gas content (Vt). When the porosity, gas saturation, brittleness index, and gas content are larger than 3%, 30%, 40%, and 1 m3/t, respectively, and the density of rock is lower than 2.7 g/cm3, then this formation can be seen as the net pay. The application of two key parameters, gas content and brittleness index, could reflect the reservoir resource basis and fracability, respectively. The gas content has a positive correlation with porosity and total organic volume, and the brittleness index has a positive correlation with siliceous and carbonate content. According to the range of these two parameters, the net pay can be classified into three types. For type I, the gas content and brittleness index are larger than 4 m3/t and 50%, respectively. For type II, either the gas content or the brittleness index is lower than 4 m3/t and 50%. For type III, the gas content should be larger than 1 m3/t and lower than 4 m3/t, and the brittleness index is between 40% and 50%. The field application case indicates that the Wufeng formation and low member of the Longmaxi formation have good quality and mainly consist of type I and II formations. In addition, it is found that there is a positive correlation between the penetration ratio for type I formation and the testing production and estimate ultimate recovery (EUR). While this ratio is larger than 50%, the testing production rate and EUR will be over 15×104 m3/d and 8000×104 m3 with a probability of 92%, which meet the requirement of exploitation with reasonable economic benefits.https://pubs.geoscienceworld.org/lithosphere/article/2021/Special%201/3364731/600850/Classification-and-Evaluation-on-Shale-Gas |
| spellingShingle | Jianlin Guo Chengye Jia Dongbo He Fankun Meng Classification and Evaluation on Shale Gas Reservoir for Wufeng-Longmaxi Formation in Chuannan Area, Sichuan Basin Lithosphere |
| title | Classification and Evaluation on Shale Gas Reservoir for Wufeng-Longmaxi Formation in Chuannan Area, Sichuan Basin |
| title_full | Classification and Evaluation on Shale Gas Reservoir for Wufeng-Longmaxi Formation in Chuannan Area, Sichuan Basin |
| title_fullStr | Classification and Evaluation on Shale Gas Reservoir for Wufeng-Longmaxi Formation in Chuannan Area, Sichuan Basin |
| title_full_unstemmed | Classification and Evaluation on Shale Gas Reservoir for Wufeng-Longmaxi Formation in Chuannan Area, Sichuan Basin |
| title_short | Classification and Evaluation on Shale Gas Reservoir for Wufeng-Longmaxi Formation in Chuannan Area, Sichuan Basin |
| title_sort | classification and evaluation on shale gas reservoir for wufeng longmaxi formation in chuannan area sichuan basin |
| url | https://pubs.geoscienceworld.org/lithosphere/article/2021/Special%201/3364731/600850/Classification-and-Evaluation-on-Shale-Gas |
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