A new method for identifying fractures in tight sandstone of a gentle structural area using well logs
Abstract In this paper, we conducted a systematic study on the development characteristics and logging prediction of fractures of the Upper Paleozoic tight gas sandstone reservoirs in the eastern Ordos Basin. A new fracture prediction method was proposed based on the variable scale fracture probabil...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Wiley
2020-11-01
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| Series: | Energy Science & Engineering |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/ese3.786 |
| _version_ | 1819172205878050816 |
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| author | Qing Guo Xuanyi Wang Le Qu |
| author_facet | Qing Guo Xuanyi Wang Le Qu |
| author_sort | Qing Guo |
| collection | DOAJ |
| description | Abstract In this paper, we conducted a systematic study on the development characteristics and logging prediction of fractures of the Upper Paleozoic tight gas sandstone reservoirs in the eastern Ordos Basin. A new fracture prediction method was proposed based on the variable scale fracture probabilistic model. The calculation steps of this method were as follows: First, the sensitivity of each conventional log series to the tight sandstone fractures was analyzed. It was found that acoustic time difference (AC), density (DEN), natural gamma ray (GR), and deep investigate double lateral resistivity (RD) have good log responses to fractures. Then, the ratio of the range (R) to the standard deviation (S) of the log data was obtained. Finally, the second derivatives of the log series AC, DEN, GR, and RD were calculated, and a new fracture index was constructed (integrated second derivative, FC) using the multiple regression method. The fracture recognition rates of this method are distributed in 64.3%‐85.7%. Therefore, the constructed integrated second derivative (FC) based on conventional logs is effective to quantitatively characterize the fracture development of tight sandstone. |
| first_indexed | 2024-12-22T20:03:29Z |
| format | Article |
| id | doaj.art-76de1ac90020457ab34e122ab6cd8e20 |
| institution | Directory Open Access Journal |
| issn | 2050-0505 |
| language | English |
| last_indexed | 2024-12-22T20:03:29Z |
| publishDate | 2020-11-01 |
| publisher | Wiley |
| record_format | Article |
| series | Energy Science & Engineering |
| spelling | doaj.art-76de1ac90020457ab34e122ab6cd8e202022-12-21T18:14:12ZengWileyEnergy Science & Engineering2050-05052020-11-018113909392410.1002/ese3.786A new method for identifying fractures in tight sandstone of a gentle structural area using well logsQing Guo0Xuanyi Wang1Le Qu2Changqing Branch of Geophysical Research Institute BGP CNPC Xi'an ChinaOil and Gas Technology Institute of Changqing Oilfield Branch Company PetroChina Xi'an ChinaPost‐Doctoral Contribution Center College of Petroleum Engineering Xi'an Shiyou University Xi'an ChinaAbstract In this paper, we conducted a systematic study on the development characteristics and logging prediction of fractures of the Upper Paleozoic tight gas sandstone reservoirs in the eastern Ordos Basin. A new fracture prediction method was proposed based on the variable scale fracture probabilistic model. The calculation steps of this method were as follows: First, the sensitivity of each conventional log series to the tight sandstone fractures was analyzed. It was found that acoustic time difference (AC), density (DEN), natural gamma ray (GR), and deep investigate double lateral resistivity (RD) have good log responses to fractures. Then, the ratio of the range (R) to the standard deviation (S) of the log data was obtained. Finally, the second derivatives of the log series AC, DEN, GR, and RD were calculated, and a new fracture index was constructed (integrated second derivative, FC) using the multiple regression method. The fracture recognition rates of this method are distributed in 64.3%‐85.7%. Therefore, the constructed integrated second derivative (FC) based on conventional logs is effective to quantitatively characterize the fracture development of tight sandstone.https://doi.org/10.1002/ese3.786fracture; conventional logsgentle tectonic zoneOrdos BasinUpper Paleozoic strata |
| spellingShingle | Qing Guo Xuanyi Wang Le Qu A new method for identifying fractures in tight sandstone of a gentle structural area using well logs Energy Science & Engineering fracture; conventional logs gentle tectonic zone Ordos Basin Upper Paleozoic strata |
| title | A new method for identifying fractures in tight sandstone of a gentle structural area using well logs |
| title_full | A new method for identifying fractures in tight sandstone of a gentle structural area using well logs |
| title_fullStr | A new method for identifying fractures in tight sandstone of a gentle structural area using well logs |
| title_full_unstemmed | A new method for identifying fractures in tight sandstone of a gentle structural area using well logs |
| title_short | A new method for identifying fractures in tight sandstone of a gentle structural area using well logs |
| title_sort | new method for identifying fractures in tight sandstone of a gentle structural area using well logs |
| topic | fracture; conventional logs gentle tectonic zone Ordos Basin Upper Paleozoic strata |
| url | https://doi.org/10.1002/ese3.786 |
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