Lacustrine carbonates in the southwest margin of the Qikou Sag, Huanghua Depression, Bohai Bay Basin
The southwest margin of the Qikou Sag is a flexural gentle slope formed by the deformation of a drape structure due to its underlying basement lifting. The sedimentary period of the Lower Member 1 of Shahejie Formation is the maximum extensional time of the Paleogene lacustrine basin. Debris from so...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2011-04-01
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| Series: | Petroleum Exploration and Development |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1876380411600220 |
| _version_ | 1818854327607885824 |
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| author | Xiugang Pu Lihong Zhou Dunqing Xiao Shuangjun Hua Changwei Chen Xuanjun Yuan Guomeng Han Wei Zhang |
| author_facet | Xiugang Pu Lihong Zhou Dunqing Xiao Shuangjun Hua Changwei Chen Xuanjun Yuan Guomeng Han Wei Zhang |
| author_sort | Xiugang Pu |
| collection | DOAJ |
| description | The southwest margin of the Qikou Sag is a flexural gentle slope formed by the deformation of a drape structure due to its underlying basement lifting. The sedimentary period of the Lower Member 1 of Shahejie Formation is the maximum extensional time of the Paleogene lacustrine basin. Debris from source areas is in shortage. In the broad littoral shallow lake, hundreds of square kilometers of lacustrine carbonates are deposited and distributed stably. The main lithologies of the sediments are biolithite and dolomite (micritic dolomite and dolomitic limestone), and the dolomites are mainly middle late buried dolomite and penecontemporaneous dolomite. Their distribution area is more than 1 650 m2, the cumulative thickness is between 5 and 25 meters, and the average thickness is about 10 meters. Intercrystal pores, intergranular pores, corrosion pores and frequent fissures are developed in the medium porosity and low permeability dolomite reservoirs. The dolomites alternate with oil shale and dark mudstone, favorable for the charge of low mature hydrocarbons and the formation of large scale accumulations. Drilling exploration practices show that the lacustrine dolomite reservoirs are characterized by medium burial depth and regional petroleum accumulation and are a new exploration area for Paleogene oil and gas. Key words: Qikou Sag, Shahejie Formation Lower Member 1, lacustrine carbonates, lithofacies, lacustrine dolomite reservoir, hydrocarbon exploration, Bohai Bay Basin |
| first_indexed | 2024-12-19T07:50:57Z |
| format | Article |
| id | doaj.art-98f175597d514b9ca768cde4d5d2ddde |
| institution | Directory Open Access Journal |
| issn | 1876-3804 |
| language | English |
| last_indexed | 2024-12-19T07:50:57Z |
| publishDate | 2011-04-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Petroleum Exploration and Development |
| spelling | doaj.art-98f175597d514b9ca768cde4d5d2ddde2022-12-21T20:30:11ZengKeAi Communications Co., Ltd.Petroleum Exploration and Development1876-38042011-04-01382136144Lacustrine carbonates in the southwest margin of the Qikou Sag, Huanghua Depression, Bohai Bay BasinXiugang Pu0Lihong Zhou1Dunqing Xiao2Shuangjun Hua3Changwei Chen4Xuanjun Yuan5Guomeng Han6Wei Zhang7PetroChina Dagang Oilfield Company, Tianjin 300280, China; Corresponding authorPetroChina Dagang Oilfield Company, Tianjin 300280, ChinaPetroChina Dagang Oilfield Company, Tianjin 300280, ChinaPetroChina Dagang Oilfield Company, Tianjin 300280, ChinaPetroChina Dagang Oilfield Company, Tianjin 300280, ChinaPetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, ChinaPetroChina Dagang Oilfield Company, Tianjin 300280, ChinaPetroChina Dagang Oilfield Company, Tianjin 300280, ChinaThe southwest margin of the Qikou Sag is a flexural gentle slope formed by the deformation of a drape structure due to its underlying basement lifting. The sedimentary period of the Lower Member 1 of Shahejie Formation is the maximum extensional time of the Paleogene lacustrine basin. Debris from source areas is in shortage. In the broad littoral shallow lake, hundreds of square kilometers of lacustrine carbonates are deposited and distributed stably. The main lithologies of the sediments are biolithite and dolomite (micritic dolomite and dolomitic limestone), and the dolomites are mainly middle late buried dolomite and penecontemporaneous dolomite. Their distribution area is more than 1 650 m2, the cumulative thickness is between 5 and 25 meters, and the average thickness is about 10 meters. Intercrystal pores, intergranular pores, corrosion pores and frequent fissures are developed in the medium porosity and low permeability dolomite reservoirs. The dolomites alternate with oil shale and dark mudstone, favorable for the charge of low mature hydrocarbons and the formation of large scale accumulations. Drilling exploration practices show that the lacustrine dolomite reservoirs are characterized by medium burial depth and regional petroleum accumulation and are a new exploration area for Paleogene oil and gas. Key words: Qikou Sag, Shahejie Formation Lower Member 1, lacustrine carbonates, lithofacies, lacustrine dolomite reservoir, hydrocarbon exploration, Bohai Bay Basinhttp://www.sciencedirect.com/science/article/pii/S1876380411600220 |
| spellingShingle | Xiugang Pu Lihong Zhou Dunqing Xiao Shuangjun Hua Changwei Chen Xuanjun Yuan Guomeng Han Wei Zhang Lacustrine carbonates in the southwest margin of the Qikou Sag, Huanghua Depression, Bohai Bay Basin Petroleum Exploration and Development |
| title | Lacustrine carbonates in the southwest margin of the Qikou Sag, Huanghua Depression, Bohai Bay Basin |
| title_full | Lacustrine carbonates in the southwest margin of the Qikou Sag, Huanghua Depression, Bohai Bay Basin |
| title_fullStr | Lacustrine carbonates in the southwest margin of the Qikou Sag, Huanghua Depression, Bohai Bay Basin |
| title_full_unstemmed | Lacustrine carbonates in the southwest margin of the Qikou Sag, Huanghua Depression, Bohai Bay Basin |
| title_short | Lacustrine carbonates in the southwest margin of the Qikou Sag, Huanghua Depression, Bohai Bay Basin |
| title_sort | lacustrine carbonates in the southwest margin of the qikou sag huanghua depression bohai bay basin |
| url | http://www.sciencedirect.com/science/article/pii/S1876380411600220 |
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