| 南方下古生界海相页岩有机质成熟度评价 |
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| 引用本文： | 徐学敏,孙玮琳,汪双清,秦婧,沈斌,郭望,杨佳佳,栗敏.南方下古生界海相页岩有机质成熟度评价[J].地球科学,2019,44(11):3717-3724. |
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| 作者姓名： | 徐学敏 孙玮琳 汪双清 秦婧 沈斌 郭望 杨佳佳 栗敏 |
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| 作者单位： | 1.国家地质实验测试中心, 北京 100037 |
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| 基金项目： | 国家自然基金项目41702159国家自然基金项目41602162国家科技重大专项2016ZX05034-003中国地质调查局地质调查项目DD20190086 |
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| 摘 要： | 为明确适用于南方下古生界海相页岩成熟度评价的沥青反射率与镜质体反射率等效换算关系，利用初始成熟度接近的洪水庄组海相页岩及龙潭组煤样在350~525℃温度范围开展了系列共置热压模拟实验，通过测定各温度下页岩中的沥青与煤中的镜质体反射率的演化规律，建立了两者之间的等效换算关系，并利用模拟样品和实际剖面样品开展了方法验证.结果表明两者满足以下关系:VRo（等效镜质体反射率）=0.879 8Rb（沥青反射率）+0.114 5（适用范围:VRo 0.61%~3.04%），本次建立的沥青反射率回归公式可以为准确评价缺乏镜质体的高演化海相页岩地层的成熟度判定提供重要参考.
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| 关 键 词： | 海相页岩 成熟度 沥青反射率 模拟实验 油气地质 |
| 收稿时间： | 2019-07-18 |
Maturity Evaluation of Marine Shale in the Lower Paleozoic in South China |
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| Abstract: | In order to clarify the equivalent conversion relationship between bitumen reflectance and vitrinite reflectance for evaluating the maturity of marine shale in the Lower Paleozoic in South China, a series of hydrocarbon generation simulation experiments were carried out in the temperature range of 350-525℃ using a shale from Hongshuizhuang Formation and a coal sample from Longtan Formation with similar maturity. An equivalent conversion relationship was established by measuring the reflectivity of bitumen from shale and vitrinite from coal at each temperature point, and also the accuracy of the method using the simulated sample and outcrop sample is validated. The result shows that they follow this relationship:VRo (equivalent vitrinite reflectance)=0.879 8Rb (bitumen reflectance) + 0.114 5 (VRo 0.61%-3.04%). The regression formula of bitumen reflectance can provide an important reference for accurately evaluating the maturity of marine shale strata without vitrinite in the South China. |
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