Characteristics and main controlling factors of tight oil reservoirs in Cretaceous Tengger Formation, A'nan Sag, Erlian Basin
A set of "special lithology" tight reservoirs related to volcanic activity developed widely in the lower submember of the first member of Cretaceous Tengger Formation (K1bt1x) in the A'nan Sag, Erlian Basin, which is the main target for tight oil exploration. Based on section observat...
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| Format: | Article |
| Language: | zho |
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Editorial Office of Petroleum Geology and Experiment
2021-01-01
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| Series: | Shiyou shiyan dizhi |
| Subjects: | |
| Online Access: | https://www.sysydz.net/cn/article/doi/10.11781/sysydz202101064 |
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| author | Xiaodong FU Tianfu ZHANG Jianping WU Xiaofang WANG Jingao ZHOU Tao JIANG Bing LI Changxin LI |
| author_facet | Xiaodong FU Tianfu ZHANG Jianping WU Xiaofang WANG Jingao ZHOU Tao JIANG Bing LI Changxin LI |
| author_sort | Xiaodong FU |
| collection | DOAJ |
| description | A set of "special lithology" tight reservoirs related to volcanic activity developed widely in the lower submember of the first member of Cretaceous Tengger Formation (K1bt1x) in the A'nan Sag, Erlian Basin, which is the main target for tight oil exploration. Based on section observation, physical property analysis, scanning electron microscopy (SEM), mercury intrusion porosimetry, CT scanning and nuclear magnetic resonance (NMR), the characteristics and main controlling factors of "sweet spots" of tight oil reservoirs with different lithologies in the K1bt1x were studied. Tuffaceous rocks, sandstones, dolomites and mudstones developed in the K1bt1x, and tuffaceous rocks and sandstones are the favorable lithologies for the development of tight oil reservoirs. The reservoir space consists of dissolved pores, intercrystalline micropores, residual intergranular pores, drainage pores and microfractures. The main reservoir space of tuff includes devitrified intercrystalline pores and dissolution pores, whereas that of sandstone includes residual intergranular pores and dissolution pores. The reservoir pore structures can be divided into 3 types and 4 subtypes. The thin-layered tuff and fine sandstone with solution pores have better pore structures, but the sedimentary tuff and dolomite have poor pore structures. The reservoir has a strong oil content heterogeneity controlled by reservoir lithology, porosity and permeability. The development of "sweet spots" in tuffaceous tight reservoirs is mainly controlled by the volcaniclastic deposition, devitrification and dissolution, while the development of "sweet spots" in sandstone reservoirs is mainly controlled by sedimentary microfacies, rock structure and dissolution. |
| first_indexed | 2024-03-07T15:45:24Z |
| format | Article |
| id | doaj.art-5286189a11704f9aa0bef39ce6fbffc5 |
| institution | Directory Open Access Journal |
| issn | 1001-6112 |
| language | zho |
| last_indexed | 2024-03-07T15:45:24Z |
| publishDate | 2021-01-01 |
| publisher | Editorial Office of Petroleum Geology and Experiment |
| record_format | Article |
| series | Shiyou shiyan dizhi |
| spelling | doaj.art-5286189a11704f9aa0bef39ce6fbffc52024-03-05T04:40:39ZzhoEditorial Office of Petroleum Geology and ExperimentShiyou shiyan dizhi1001-61122021-01-01431647610.11781/sysydz202101064sysydz-43-1-64Characteristics and main controlling factors of tight oil reservoirs in Cretaceous Tengger Formation, A'nan Sag, Erlian BasinXiaodong FU0Tianfu ZHANG1Jianping WU2Xiaofang WANG3Jingao ZHOU4Tao JIANG5Bing LI6Changxin LI7PetroChina Hangzhou Research Institute of Geology, Hangzhou, Zhejiang 310023, ChinaPetroChina Hangzhou Research Institute of Geology, Hangzhou, Zhejiang 310023, ChinaExploration and Development Research Institute of Huabei Oilfield Company, PetroChina, Renqiu, Hebei 062552, ChinaPetroChina Hangzhou Research Institute of Geology, Hangzhou, Zhejiang 310023, ChinaPetroChina Hangzhou Research Institute of Geology, Hangzhou, Zhejiang 310023, ChinaExploration and Development Research Institute of Huabei Oilfield Company, PetroChina, Renqiu, Hebei 062552, ChinaExploration and Development Research Institute of Huabei Oilfield Company, PetroChina, Renqiu, Hebei 062552, ChinaExploration and Development Research Institute of Huabei Oilfield Company, PetroChina, Renqiu, Hebei 062552, ChinaA set of "special lithology" tight reservoirs related to volcanic activity developed widely in the lower submember of the first member of Cretaceous Tengger Formation (K1bt1x) in the A'nan Sag, Erlian Basin, which is the main target for tight oil exploration. Based on section observation, physical property analysis, scanning electron microscopy (SEM), mercury intrusion porosimetry, CT scanning and nuclear magnetic resonance (NMR), the characteristics and main controlling factors of "sweet spots" of tight oil reservoirs with different lithologies in the K1bt1x were studied. Tuffaceous rocks, sandstones, dolomites and mudstones developed in the K1bt1x, and tuffaceous rocks and sandstones are the favorable lithologies for the development of tight oil reservoirs. The reservoir space consists of dissolved pores, intercrystalline micropores, residual intergranular pores, drainage pores and microfractures. The main reservoir space of tuff includes devitrified intercrystalline pores and dissolution pores, whereas that of sandstone includes residual intergranular pores and dissolution pores. The reservoir pore structures can be divided into 3 types and 4 subtypes. The thin-layered tuff and fine sandstone with solution pores have better pore structures, but the sedimentary tuff and dolomite have poor pore structures. The reservoir has a strong oil content heterogeneity controlled by reservoir lithology, porosity and permeability. The development of "sweet spots" in tuffaceous tight reservoirs is mainly controlled by the volcaniclastic deposition, devitrification and dissolution, while the development of "sweet spots" in sandstone reservoirs is mainly controlled by sedimentary microfacies, rock structure and dissolution.https://www.sysydz.net/cn/article/doi/10.11781/sysydz202101064tight oil reservoirgeological characteristicsmain controlling factora'nan sagerlian basin |
| spellingShingle | Xiaodong FU Tianfu ZHANG Jianping WU Xiaofang WANG Jingao ZHOU Tao JIANG Bing LI Changxin LI Characteristics and main controlling factors of tight oil reservoirs in Cretaceous Tengger Formation, A'nan Sag, Erlian Basin Shiyou shiyan dizhi tight oil reservoir geological characteristics main controlling factor a'nan sag erlian basin |
| title | Characteristics and main controlling factors of tight oil reservoirs in Cretaceous Tengger Formation, A'nan Sag, Erlian Basin |
| title_full | Characteristics and main controlling factors of tight oil reservoirs in Cretaceous Tengger Formation, A'nan Sag, Erlian Basin |
| title_fullStr | Characteristics and main controlling factors of tight oil reservoirs in Cretaceous Tengger Formation, A'nan Sag, Erlian Basin |
| title_full_unstemmed | Characteristics and main controlling factors of tight oil reservoirs in Cretaceous Tengger Formation, A'nan Sag, Erlian Basin |
| title_short | Characteristics and main controlling factors of tight oil reservoirs in Cretaceous Tengger Formation, A'nan Sag, Erlian Basin |
| title_sort | characteristics and main controlling factors of tight oil reservoirs in cretaceous tengger formation a nan sag erlian basin |
| topic | tight oil reservoir geological characteristics main controlling factor a'nan sag erlian basin |
| url | https://www.sysydz.net/cn/article/doi/10.11781/sysydz202101064 |
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