临南油田井中烃类地球化学特征研究

Study on the borehole hydrocarbon geochemical characteristics in Linnan oilfield

通过对临南油田3口井纵向上不同层段岩屑样品的油气地球化学检测,研究了该区的油气井与干井的井中烃类地球化学特征,讨论了井中化探方法指标对烃源岩、储集层、盖层的响应关系。油气井纵向剖面的烃类地球化学特征的研究表明,临南油田自油层向上存在烃类的垂向微渗漏现象,烃类组分及荧光光谱强度在垂向上明显存在正向梯度,是近地表化探异常形成的前提条件。该研究成果拓宽了井中地球化学勘探的应用领域,取得了较理想的效果。

Through oil-gas geochemical detection to the cutting samples from different vertical intervals of three wells in Linnan oilfield, the authors studied the hydrocarbon geochemical characteristics of oil-gas wells and dry wells in this area, and discussed the response relation between indexes of the borehole geochemical exploration method with the hydrocarbon source rock, reservoir and overlying formation. The study on the hydrocarbon geochemical characteristics of the vertical profiles for the oil-gas wells indicated that there existed hydrocarbons vertical micro-leaking up phenomena from oil layers in Linnan oilfield, hydrocarbon compound and fluorescence spectral intensity obviously existed forward gradient in vertical, which was the premise for forming near-surface geochemical exploration abnormalities. The result this study widened the application field of the borehole geochemical exploration and achieved the better results.