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Evolution characteristics and potential area prediction of shale in Wuerxun Sag |
YANG Song-Lin1, LI Yan2, LIU Ya-Xuan3, YANG Xue3, JIANG Wen-Bo4 |
1. Yantai Gold College,Yantai 264000,China 2. School of Earth Sciences, Northeast Petroleum University, Daqing 163318,China 3. Laojunmiao Oil Production Plant of Yumen Oilfield Company, PetroChina, Jiuquan 735019,China 4. Exploration and Development Research Institute of Qinghai Oilfield, Dunhuang 736200,China |
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Abstract Wuerxun Sag is an important oil-bearing area in the south of Hailaer basin, which has great exploration potential. This paper determines the main source rocks in Wuerxun Sag by oil source correlation, analyzes the development characteristics of source rocks in different regions and geochemical indicators such as organic matter abundance and type, evaluates the oil generation maturity and accumulation stage of main source rocks in Wuerxun Sag, and judges the oil and gas filling history and predicts the preferred exploration potential position by measuring the homogenization temperature of fluid inclusions. It is found that the oil source in different areas of Wuerxun Sag is not identical. The oil reservoir in the north of Wuerxun Sag is derived from the parent material of mud shale rock of Nantun formation. In the south of Wuerxun Sag, besides the mud shale of Nantun formation, there is oil flow from dark mudstone of Tongbomiao formation. Wuerxun Sag has two stages of hydrocarbon accumulation: The first stage is from the later Yimin formation to the early Qingyuangang formation; The second stage is the late structural activity of Qingyuangang formation, which makes the early oil reservoir redistribute and inject new traps. It is considered that the west side of Wubei sag and the east side of Wunan sag are two important exploration potential zones.
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Received: 24 July 2020
Published: 20 August 2021
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Division of structural units in Hailaer Basin
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Maturity analysis of source rocks
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层位 | 岩性 | 有机碳 | 氯仿沥青“A” | 热解生烃潜量 | 评价结果 | 范围/% | 平均值/% | 范围/% | 平均值/% | 范围/10-3 | 平均值/10-3 | K1n2 | 泥页岩 | 0.27~5.9 | 2.2 | 0.0010~0.23 | 0.057 | 0.12~21.1 | 7.10 | 中—好 | K1n1 | 泥页岩 | 0.13~4.3 | 2.0 | 0.001~0.51 | 0.12 | 0.05~37.0 | 5.38 | 中—好 | K1t | 泥岩 | 0.09~3.4 | 1.0 | 0.003~0.12 | 0.06 | 0.09~11.0〗 | 3.8 | 中等 |
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Geochemical parameters of organic matter in source rocks of Wuerxun Sag
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Analysis of organic matter types
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Quality chromatogram of crude oil and source rock in Wuerxun depression
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Carbon isotope characteristics of crude oil and source rocks
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Source rock evolution profile of Wuerxun deep subsag
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Burial history, thermal history and filling history of strata in Wuerxun Sag
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Homogenization temperature distribution
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Distribution of main source rocks and prediction of potential areas in Wuerxun Sag
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