鄂尔多斯盆地中部油气聚集区带地球化学特征研究

鄂尔多斯盆地中部存在明显的、东西方向的地球化学异常区带，异常区带有异常范围大、强度高和分布有序等特征，是地下油气信息的反映。从化探烃类指标浓度变化、比值特征和三维荧光图谱特征等方面对异常进行了研究，并结合本区的构造特征和石油地质条件对异常的形成进行了分析，证实了化探异常的形成与盆地中部的大型东西向构造带和东西向气聚集区具有密切的关系，对天然气的勘探具有参考价值。

GEOCHEMICAL CHARACTERISTICS OF OIL/GAS ACCUMULATION ZONES IN THE MIDDLE OF ORDOS BASIN

The geochemical anomaly zones in the middle of Ordos Basin, which has latitudinal direction expansion, large scope, high intensity and anomalous distribution in order, reflects its underground oil and gas information. According to the characteristics of hydrocarbon concentrations, hydrocarbon ratios and three-dimensional fluorography spectrum signature of oil and gas geochemical exploration indictor, combined geochemical anomaly with region structural feature and petroleum geology condition, it is clearly concluded that the information of geochemical anomaly zones have intimate relations with east-west trending structure zone and east-west accumulation area of nature gas. The research results, not only possess important practical meaning toward geochemical exploration technology at forecast natural gas, but also have reference value for natural gas prospecting.