QUANTITATIVE EVALUATION OF THE DIAGENESIS AND POROSITY EVOLUTION OF TIGHT SANDSTONE RESERVOIRS: A CASE STUDY OF THE YANCHANG FORMATION IN THE SOUTHERN ORDOS BASIN, CHINA
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| Format: | Artículo científico |
| Language: | en |
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ECOPETROL S.A.
2019
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| _version_ | 1876487819505958912 |
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| author | Meng Xiao |
| author_facet | Meng Xiao |
| contents | QUANTITATIVE EVALUATION OF THE DIAGENESIS AND POROSITY EVOLUTION OF TIGHT SANDSTONE RESERVOIRS: A CASE STUDY OF THE YANCHANG FORMATION IN THE SOUTHERN ORDOS BASIN, CHINA Meng Xiao Guiqiang Qiu Xuanjun Yuan Songtao Wu Dawei Cheng Chunfang Chen Ingeniería Diagenesis Ordos Basin Pore Evolution Reservoir Characteristics Evaluation of the pore evolution is key to gaining a better understanding of oil migration and accumulation in tight oil exploration for tight sandstone; to study the diagenesis and porosity evolution of tight sandstone reservoirs, we analysed the 8th member of the Yanchang Formation by core observation, thin section observation, cathodoluminescence, scanning electron microscopy, and logging data analysis. The following conclusions can be drawn (1) In the typical tight sandstone reservoir, numerous secondary pores developed at burial depths in the range of 1300 m to 1400 m, and approximately 1500 m to 1600 m. (2) Compaction was the most influential factor of reservoir density and decreased the average pore size by 24.8%. Carbonate cementation decreased the porosity by 8.2%. The most important diagenetic process for increasing the reservoir porosity was dissolution, which increased the pore size by 5.1%. In addition, chlorite played an active role in inhibiting secondary quartz growth and preserving primary pores. (3) The early gas invasion can inhibit diagenesis, and the organic acids produced by the later oil can increase dissolution, so that the high oil saturation phenomenon becomes more obvious. 2019 artículo científico 0122-5383 https://www.redalyc.org/articulo.oa?id=46570769002 https://www.redalyc.org/journal/465/46570769002/ https://www.redalyc.org/journal/465/46570769002/html/ https://www.redalyc.org/journal/465/46570769002/46570769002.epub https://www.redalyc.org/journal/465/46570769002/movil 10.29047/01225383.148 en http://www.redalyc.org/revista.oa?id=465 CT&F Ciencia, Tecnología y Futuro application/pdf ECOPETROL S.A. CT&F Ciencia, Tecnología y Futuro (Colombia) Num.1 Vol.9 |
| format | Artículo científico |
| id | redalyc_46570769002 |
| institution | Redalyc |
| language | en |
| publishDate | 2019 |
| publisher | ECOPETROL S.A. |
| spellingShingle | QUANTITATIVE EVALUATION OF THE DIAGENESIS AND POROSITY EVOLUTION OF TIGHT SANDSTONE RESERVOIRS: A CASE STUDY OF THE YANCHANG FORMATION IN THE SOUTHERN ORDOS BASIN, CHINA Meng Xiao Ingeniería Diagenesis Ordos Basin Pore Evolution Reservoir Characteristics QUANTITATIVE EVALUATION OF THE DIAGENESIS AND POROSITY EVOLUTION OF TIGHT SANDSTONE RESERVOIRS: A CASE STUDY OF THE YANCHANG FORMATION IN THE SOUTHERN ORDOS BASIN, CHINA Meng Xiao Guiqiang Qiu Xuanjun Yuan Songtao Wu Dawei Cheng Chunfang Chen Ingeniería Diagenesis Ordos Basin Pore Evolution Reservoir Characteristics Evaluation of the pore evolution is key to gaining a better understanding of oil migration and accumulation in tight oil exploration for tight sandstone; to study the diagenesis and porosity evolution of tight sandstone reservoirs, we analysed the 8th member of the Yanchang Formation by core observation, thin section observation, cathodoluminescence, scanning electron microscopy, and logging data analysis. The following conclusions can be drawn (1) In the typical tight sandstone reservoir, numerous secondary pores developed at burial depths in the range of 1300 m to 1400 m, and approximately 1500 m to 1600 m. (2) Compaction was the most influential factor of reservoir density and decreased the average pore size by 24.8%. Carbonate cementation decreased the porosity by 8.2%. The most important diagenetic process for increasing the reservoir porosity was dissolution, which increased the pore size by 5.1%. In addition, chlorite played an active role in inhibiting secondary quartz growth and preserving primary pores. (3) The early gas invasion can inhibit diagenesis, and the organic acids produced by the later oil can increase dissolution, so that the high oil saturation phenomenon becomes more obvious. 2019 artículo científico 0122-5383 https://www.redalyc.org/articulo.oa?id=46570769002 https://www.redalyc.org/journal/465/46570769002/ https://www.redalyc.org/journal/465/46570769002/html/ https://www.redalyc.org/journal/465/46570769002/46570769002.epub https://www.redalyc.org/journal/465/46570769002/movil 10.29047/01225383.148 en http://www.redalyc.org/revista.oa?id=465 CT&F Ciencia, Tecnología y Futuro application/pdf ECOPETROL S.A. CT&F Ciencia, Tecnología y Futuro (Colombia) Num.1 Vol.9 |
| title | QUANTITATIVE EVALUATION OF THE DIAGENESIS AND POROSITY EVOLUTION OF TIGHT SANDSTONE RESERVOIRS: A CASE STUDY OF THE YANCHANG FORMATION IN THE SOUTHERN ORDOS BASIN, CHINA |
| topic | Ingeniería Diagenesis Ordos Basin Pore Evolution Reservoir Characteristics |
| url | https://www.redalyc.org/articulo.oa?id=46570769002 https://www.redalyc.org/journal/465/46570769002/ https://www.redalyc.org/journal/465/46570769002/html/ https://www.redalyc.org/journal/465/46570769002/46570769002.epub https://www.redalyc.org/journal/465/46570769002/movil |