Study and application of identification and description methods for lithologic traps in large braided river sheet composite channels
The gas reservoirs in the Permian tight sandstones in the Ordos Basin are characterized by near source, tightness, large-scale area of gas reservoir, distribution along the main channel, and strong heterogeneity. Influenced by the changes in the internal physical properties of sand bodies, the diffe...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Petroleum Geology and Experiment
2021-05-01
|
| Series: | Shiyou shiyan dizhi |
| Subjects: | |
| Online Access: | https://www.sysydz.net/cn/article/doi/10.11781/sysydz202103432 |
| _version_ | 1797277207317446656 |
|---|---|
| author | Wei ZHANG Faqi HE Xiangbin YAN Lixue CAI |
| author_facet | Wei ZHANG Faqi HE Xiangbin YAN Lixue CAI |
| author_sort | Wei ZHANG |
| collection | DOAJ |
| description | The gas reservoirs in the Permian tight sandstones in the Ordos Basin are characterized by near source, tightness, large-scale area of gas reservoir, distribution along the main channel, and strong heterogeneity. Influenced by the changes in the internal physical properties of sand bodies, the difference between gas and water is not obvious, and the gas boundary is also unclear. Therefore, the trap identification and the description of this type of gas reservoir is not like those for a single trap in the ubiquitous cases. It should be focused on the distribution of the composite channel sand bodies formed by the spatial superposition of effective single sand body, so as to determine the "sweet spots" of the maximum reserve unit. A case study was made for the first member of Xiashihezi Formation of Lower Permian in the Duguijiahan trap of Hangjinqi area, northern part of Ordos Basin. The characteristics as well as identification and description methods for lithologic traps in sheet-shaped composite channels of large-scale braided rivers were discussed. Constrained by the sequence framework and based on the geological model, a well-seismic joint analysis of sedimentary facies was employed here to realize the effective prediction and description of effective sandstone reservoirs and their boundary distributions in braided river channels. A six-step evaluation of this type of trap was introduced, which could predict the effective reservoirs in sheet-shaped composite channels of braided rivers by using relatively low-resolution seismic data. With the continuous application and improvement of the technical series, the proven natural gas reserves in lithological traps of the first member of Xiashihezi Formation in the Duguijiahan trap have exceeded 100 billion cubic meters. |
| first_indexed | 2024-03-07T15:45:19Z |
| format | Article |
| id | doaj.art-3dfd0d7007c04ea09833f6edcb15ec60 |
| institution | Directory Open Access Journal |
| issn | 1001-6112 |
| language | zho |
| last_indexed | 2024-03-07T15:45:19Z |
| publishDate | 2021-05-01 |
| publisher | Editorial Office of Petroleum Geology and Experiment |
| record_format | Article |
| series | Shiyou shiyan dizhi |
| spelling | doaj.art-3dfd0d7007c04ea09833f6edcb15ec602024-03-05T04:38:56ZzhoEditorial Office of Petroleum Geology and ExperimentShiyou shiyan dizhi1001-61122021-05-0143343244210.11781/sysydz202103432sysydz-43-3-432Study and application of identification and description methods for lithologic traps in large braided river sheet composite channelsWei ZHANG0Faqi HE1Xiangbin YAN2Lixue CAI3SINOPEC North China Oil and Gas Company, Zhengzhou, Henan 450006, ChinaSINOPEC North China Oil and Gas Company, Zhengzhou, Henan 450006, ChinaSINOPEC Petroleum Exploration and Production Research Institute, Beijing 102206, ChinaSINOPEC Petroleum Exploration and Production Research Institute, Beijing 102206, ChinaThe gas reservoirs in the Permian tight sandstones in the Ordos Basin are characterized by near source, tightness, large-scale area of gas reservoir, distribution along the main channel, and strong heterogeneity. Influenced by the changes in the internal physical properties of sand bodies, the difference between gas and water is not obvious, and the gas boundary is also unclear. Therefore, the trap identification and the description of this type of gas reservoir is not like those for a single trap in the ubiquitous cases. It should be focused on the distribution of the composite channel sand bodies formed by the spatial superposition of effective single sand body, so as to determine the "sweet spots" of the maximum reserve unit. A case study was made for the first member of Xiashihezi Formation of Lower Permian in the Duguijiahan trap of Hangjinqi area, northern part of Ordos Basin. The characteristics as well as identification and description methods for lithologic traps in sheet-shaped composite channels of large-scale braided rivers were discussed. Constrained by the sequence framework and based on the geological model, a well-seismic joint analysis of sedimentary facies was employed here to realize the effective prediction and description of effective sandstone reservoirs and their boundary distributions in braided river channels. A six-step evaluation of this type of trap was introduced, which could predict the effective reservoirs in sheet-shaped composite channels of braided rivers by using relatively low-resolution seismic data. With the continuous application and improvement of the technical series, the proven natural gas reserves in lithological traps of the first member of Xiashihezi Formation in the Duguijiahan trap have exceeded 100 billion cubic meters.https://www.sysydz.net/cn/article/doi/10.11781/sysydz202103432sheet-shaped composite channeltight sandstone gaseffective reservoirhangjinqi areaordos basin |
| spellingShingle | Wei ZHANG Faqi HE Xiangbin YAN Lixue CAI Study and application of identification and description methods for lithologic traps in large braided river sheet composite channels Shiyou shiyan dizhi sheet-shaped composite channel tight sandstone gas effective reservoir hangjinqi area ordos basin |
| title | Study and application of identification and description methods for lithologic traps in large braided river sheet composite channels |
| title_full | Study and application of identification and description methods for lithologic traps in large braided river sheet composite channels |
| title_fullStr | Study and application of identification and description methods for lithologic traps in large braided river sheet composite channels |
| title_full_unstemmed | Study and application of identification and description methods for lithologic traps in large braided river sheet composite channels |
| title_short | Study and application of identification and description methods for lithologic traps in large braided river sheet composite channels |
| title_sort | study and application of identification and description methods for lithologic traps in large braided river sheet composite channels |
| topic | sheet-shaped composite channel tight sandstone gas effective reservoir hangjinqi area ordos basin |
| url | https://www.sysydz.net/cn/article/doi/10.11781/sysydz202103432 |
| work_keys_str_mv | AT weizhang studyandapplicationofidentificationanddescriptionmethodsforlithologictrapsinlargebraidedriversheetcompositechannels AT faqihe studyandapplicationofidentificationanddescriptionmethodsforlithologictrapsinlargebraidedriversheetcompositechannels AT xiangbinyan studyandapplicationofidentificationanddescriptionmethodsforlithologictrapsinlargebraidedriversheetcompositechannels AT lixuecai studyandapplicationofidentificationanddescriptionmethodsforlithologictrapsinlargebraidedriversheetcompositechannels |