煤系泥页岩有机地球化学特征及生烃潜力评价
Evaluation of organic geochemical characteristics and hydrocarbon generation potential of coal measure mud shale
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摘要: 为了研究海陆交互相煤系泥页岩有机地球化学特征，采集沁水盆地榆社-武乡区块中石炭-二叠纪煤系10口页岩气井444块岩样，在开展总有机碳含量（TOC）、岩石热解、镜质组反射率等测试分析基础上，研究了榆社-武乡区块中石炭-二叠系海陆交互相煤系泥页岩的有机地球化学特征。研究结果表明：榆社-武乡区块下石盒子组、山西组、太原组泥岩TOC平均值分别为0.90%、2.38%和2.66%；泥页岩有机质类型主要是Ⅲ型干酪根；绝大多数泥页岩样品的最大热解峰温Tmax和镜质组反射率Ro分别大于465 ℃和2.0%，处于过成熟干气阶段，转化率水平较高；有机地球化学特征表明太原组是页岩气勘探的首选层位，山西组具有一定的页岩气资源潜力，而下石盒子组有机质丰度最低，不具资源意义。Abstract: In order to study the organic geochemical characteristics of the marine-continental coal-sediment shale, a total of 444 rocks from 10 mud shale gas wells in the Carboniferous-Permian coal system in Yushe-Wuxiang Block of Qinshui Basin were collected, and the total organic carbon content (TOC) was developed. Based on the analysis of rock pyrolysis and vitrinite reflectivity, the organic geochemical characteristics of the Carboniferous-Permian marine-continental coal-sediment mud shale in Yushe-Wuxiang Block were studied. The results show that the average values of TOC from Xiashihezi, Shanxi and Taiyuan Formations in Yushe-Wuxiang Block are 0.90%, 2.38% and 2.66%, respectively. The organic matter types of the mud shale are mainly Type III Kerogen. The maximum pyrolysis peak temperature (Tmax) and vitrinite reflectance (Ro) of most mud shale samples are greater than 465 ℃ and 2.0%, respectively, suggesting that the over-mature dry gas stage, and the conversion rate is higher. The organic geochemical characteristics of Carboniferous-Permian coal measure shales indicated that the Taiyuan formation is the preferred horizon for shale gas exploration, and Shanxi formation has a certain mud shale gas resource potential while Xiashihezi Formation has the lowest organic matter abundance and has no resource significance.
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