论文部分内容阅读
以取自尼日尼亚上贝努埃地槽Gongola盆地Kolmani-1井的样品为基础,对其放射性热产量进行了估算,并对放射性热产量对沉积物生油气潜力的影响进行了分析。研究采用精确标定的碘化钠伽马射线检测系统,对不同层组的38块样品(取样间隔73.2 m,包括砂岩、页岩、煤质页岩、砂质页岩、泥质砂岩)进行了40K、238U及232Th的放射性分析。研究结果表明,沉积物中放射性元素的放射性浓度存在显著变化,40K浓度最高;沉积物放射性热产量为228.44~1 412.82 p W/kg;Kolmani-1井砂岩和砂质页岩属于低热产量沉积物,煤质页岩、页岩及泥质砂岩属于中热产量沉积物,潜在烃源岩(页岩和煤质页岩层段)的放射性热产量值主要位于中热产量范围(750~1500 p W/kg),同时具有生成液态烃和气态烃的能力。此外,沉积物的放射性热量约占盆地总地表热通量的10.9%~20.9%,沉积物的放射性热量是总地表热通量的重要组成部分,应将其纳入盆地的热模拟。
Based on the samples taken from Kolmani-1 well in the Gongola basin of the Upper Benueu-gully basin, Nigeria, the radioactive heat production was estimated and the impact of radioactive heat production on the hydrocarbon potential of the sediments was analyzed. Using a calibrated sodium iodide gamma ray detection system, 38 samples (sampling interval 73.2 m, including sandstone, shale, coal shale, sandy shale, and shaly sands) from different layers were analyzed Radioactivity analysis of 40K, 238U and 232Th. The results show that there is a significant change in the radioactive concentrations of radioactive elements in sediments, with the highest concentration of 40K; the radioactive heat production of sediments is 228.44-1 412.82 pW / kg; well of Kolmani-1 sandstone and sandy shale belong to low-heat-yield sediment , Coal shale, shale and shaly sandstone belong to moderate-heat production sediments. The potential radiogenic heat production of potential source rocks (shale and coal shale intervals) is mainly located in the medium heat production range (750 ~ 1500 pW / kg), while having the ability to generate liquid hydrocarbons and gaseous hydrocarbons. In addition, the radioactive heat of the sediments accounts for about 10.9% -20.9% of the total surface heat flux of the basin. The radioactive heat of the sediments is an important part of the total surface heat flux and should be incorporated into the thermal simulation of the basin.