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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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鄂尔多斯盆地西南部上古生界烃源岩特征及其对天然气藏形成与分布的控制作用
Keywords: 上古生界,烃源岩,气源条件,控制作用,运移
Abstract:
？利用有机质丰度、类型、成熟度及生气强度指标对鄂尔多斯盆地西南部上古生界烃源岩进行综合分析，确定主力气源岩及平面分布特征，并与苏里格地区气源条件进行对比，分析气源条件对天然气藏形成与分布的控制作用。研究表明，研究区上古生界烃源岩包括山西组、太原组的煤层和暗色泥岩，其中煤层是主力烃源岩，平均厚度为4.7m，苏里格地区煤层平均厚度为14m。烃源岩有机质丰度较高，山西组和太原组煤层残余有机碳均值分别为54.94%和66.96%，泥岩残余有机碳均值分别为2.88%和1.75%；干酪根碳同位素值介于-24.56‰～-22.05‰之间，属于ⅲ型干酪根；镜质体反射率介于1.6%～3.2%之间，均值为2.3%，整体处于高成熟—过成熟阶段；研究区生气强度介于(8～20)×108m3/km2之间，而苏里格地区的介于(11～29)×108m3/km2之间。与苏里格地区相比，研究区气源条件略显较差。研究区的气源条件对气藏的形成与分布起着明显的控制作用。平面上研究区的产气井主要分布在煤层厚度大于4m，生气强度大于10×108m3/km2的区域，且存在随着烃源岩条件的变好含气性也变好的趋势；纵向上天然气垂向运移距离与煤层厚度和生气强度存在良好的正相关关系，煤层厚度越大、生气强度越高，天然气垂向运移距离越远。
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