Geological characteristics of unconventional tight oil reservoir (109 t): A case study of Upper Cretaceous Qingshankou Formation, northern Songliao Basin, NE China
The Daqing exploration area in the northern Songliao Basin has great potential for unconventional oil and gas resources, among which the total resources of tight oil alone exceed 109 t and is regarded as an important resource base of Daqing oilfield. After years of exploration in the Qijia area, Son...
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KeAi Communications Co., Ltd.
2024-01-01
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| Series: | China Geology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2096519224000557 |
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| author | Li-zhi Shi Zhuo-zhuo Wang Zhan-tao Xing Shan Meng Shuai Guo Si-miao Wu Li-yan Luo |
| author_facet | Li-zhi Shi Zhuo-zhuo Wang Zhan-tao Xing Shan Meng Shuai Guo Si-miao Wu Li-yan Luo |
| author_sort | Li-zhi Shi |
| collection | DOAJ |
| description | The Daqing exploration area in the northern Songliao Basin has great potential for unconventional oil and gas resources, among which the total resources of tight oil alone exceed 109 t and is regarded as an important resource base of Daqing oilfield. After years of exploration in the Qijia area, Songliao Basin, NE China, tight oil has been found in the Upper Cretaceous Qingshankou Formation. To work out tight oil’s geological characteristics, taking tight oil in Gaotaizi oil layers of the Upper Cretaceous Qingshankou Formation in northern Songliao Basin as an example, this paper systematically analyzed the geological characteristics of unconventional tight oil in Gao3 and Gao4 layers of the Qijia area, based on the data of the geological survey, well drilling journey, well logging, and test. It is that three sets of hydrocarbon source rocks (K2qn1, K2qn2+3, and K2n1) develop in the examined area, and exhibit excellent type I and II kerogens, high organic matter abundance, and moderate maturity. The reservoir is generally composed of thin-bedded mudstone, siltstone, and sandstone, and presents poor porosity (average 8.5 vol.%) and air permeability (average 4 mD). The main reservoir space primarily includes intergranular pores, secondary soluble pores, and intergranular soluble pores. Three types of orifice throats were identified, namely fine throat, extra-fine throat, and micro-fine throat. The siltstone is generally oil-bearing, the reservoirs with slime and calcium become worse oil-bearing, and the mudstone has no obvious oil-bearing characteristics. The brittleness indices of the sandstone in the tight oil reservoir range from 40% to 60%, and those of the mudstone range from 40% to 45%, indicating a better brittleness of the tight oil reservoir. Based on the study of typical core hole data, this paper gives a comprehensive evaluation of the properties of the tight oil and establishes a tight oil single well composite bar chart as well as the initial evaluation system with the core of properties in the tight oil reservoir. This study has theoretical guiding significance and practical application value for tight oil exploration and evaluation in the Qijia area.©2024 China Geology Editorial Office. |
| format | Article |
| id | doaj-art-04def726de4e4223ac12f6a43fe196bd |
| institution | Kabale University |
| issn | 2589-9430 |
| language | English |
| publishDate | 2024-01-01 |
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| series | China Geology |
| spelling | doaj-art-04def726de4e4223ac12f6a43fe196bd2025-08-20T03:28:37ZengKeAi Communications Co., Ltd.China Geology2589-94302024-01-0171516210.31035/cg2022072Geological characteristics of unconventional tight oil reservoir (109 t): A case study of Upper Cretaceous Qingshankou Formation, northern Songliao Basin, NE ChinaLi-zhi Shi0Zhuo-zhuo Wang1Zhan-tao Xing2Shan Meng3Shuai Guo4Si-miao Wu5Li-yan Luo6Chinese Academy of Geological Sciences, Beijing 100037, China; First author: E-mail address: 86547864@qq.com (Li-zhi Shi).Beijing Institute of Engineering Geology, Beijing 100048, China; Corresponding author: E-mail address: slzwzz0618@sina.com (Zhuo-zhuo Wang); xingzhantao@126.com (Zhan-Tao Xing).Chinese Academy of Geological Sciences, Beijing 100037, China; Corresponding author: E-mail address: slzwzz0618@sina.com (Zhuo-zhuo Wang); xingzhantao@126.com (Zhan-Tao Xing).Beijing Institute of Engineering Geology, Beijing 100048, ChinaBeijing Institute of Engineering Geology, Beijing 100048, ChinaBeijing Institute of Engineering Geology, Beijing 100048, ChinaChinese Academy of Geological Sciences, Beijing 100037, ChinaThe Daqing exploration area in the northern Songliao Basin has great potential for unconventional oil and gas resources, among which the total resources of tight oil alone exceed 109 t and is regarded as an important resource base of Daqing oilfield. After years of exploration in the Qijia area, Songliao Basin, NE China, tight oil has been found in the Upper Cretaceous Qingshankou Formation. To work out tight oil’s geological characteristics, taking tight oil in Gaotaizi oil layers of the Upper Cretaceous Qingshankou Formation in northern Songliao Basin as an example, this paper systematically analyzed the geological characteristics of unconventional tight oil in Gao3 and Gao4 layers of the Qijia area, based on the data of the geological survey, well drilling journey, well logging, and test. It is that three sets of hydrocarbon source rocks (K2qn1, K2qn2+3, and K2n1) develop in the examined area, and exhibit excellent type I and II kerogens, high organic matter abundance, and moderate maturity. The reservoir is generally composed of thin-bedded mudstone, siltstone, and sandstone, and presents poor porosity (average 8.5 vol.%) and air permeability (average 4 mD). The main reservoir space primarily includes intergranular pores, secondary soluble pores, and intergranular soluble pores. Three types of orifice throats were identified, namely fine throat, extra-fine throat, and micro-fine throat. The siltstone is generally oil-bearing, the reservoirs with slime and calcium become worse oil-bearing, and the mudstone has no obvious oil-bearing characteristics. The brittleness indices of the sandstone in the tight oil reservoir range from 40% to 60%, and those of the mudstone range from 40% to 45%, indicating a better brittleness of the tight oil reservoir. Based on the study of typical core hole data, this paper gives a comprehensive evaluation of the properties of the tight oil and establishes a tight oil single well composite bar chart as well as the initial evaluation system with the core of properties in the tight oil reservoir. This study has theoretical guiding significance and practical application value for tight oil exploration and evaluation in the Qijia area.©2024 China Geology Editorial Office.http://www.sciencedirect.com/science/article/pii/S2096519224000557Unconventional oil and gasTight oilThin-bedded mudstone-siltstone-sandstonereservoirQijia areaQingshankou Formation |
| spellingShingle | Li-zhi Shi Zhuo-zhuo Wang Zhan-tao Xing Shan Meng Shuai Guo Si-miao Wu Li-yan Luo Geological characteristics of unconventional tight oil reservoir (109 t): A case study of Upper Cretaceous Qingshankou Formation, northern Songliao Basin, NE China China Geology Unconventional oil and gas Tight oil Thin-bedded mudstone-siltstone-sandstone reservoir Qijia area Qingshankou Formation |
| title | Geological characteristics of unconventional tight oil reservoir (109 t): A case study of Upper Cretaceous Qingshankou Formation, northern Songliao Basin, NE China |
| title_full | Geological characteristics of unconventional tight oil reservoir (109 t): A case study of Upper Cretaceous Qingshankou Formation, northern Songliao Basin, NE China |
| title_fullStr | Geological characteristics of unconventional tight oil reservoir (109 t): A case study of Upper Cretaceous Qingshankou Formation, northern Songliao Basin, NE China |
| title_full_unstemmed | Geological characteristics of unconventional tight oil reservoir (109 t): A case study of Upper Cretaceous Qingshankou Formation, northern Songliao Basin, NE China |
| title_short | Geological characteristics of unconventional tight oil reservoir (109 t): A case study of Upper Cretaceous Qingshankou Formation, northern Songliao Basin, NE China |
| title_sort | geological characteristics of unconventional tight oil reservoir 109 t a case study of upper cretaceous qingshankou formation northern songliao basin ne china |
| topic | Unconventional oil and gas Tight oil Thin-bedded mudstone-siltstone-sandstone reservoir Qijia area Qingshankou Formation |
| url | http://www.sciencedirect.com/science/article/pii/S2096519224000557 |
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