东明凹陷土壤吸附烃的石油化探效果

经过对吸附烃各指标的对比研究,发现C₃⁺①指标不受地表干扰因素的影响,它的异常反映的可能是地下油气的信息。用C₃⁺指标圈定了五个异常,其中Ⅰ号异常已经钻出了工业油流;Ⅱ、Ⅲ号异常有很大的油气勘探价值;Ⅳ号异常也有一定的勘探意义;Ⅴ号异常没有勘探价值。同时,地温的Ⅴ号异常已经发展成油田,称三春集油田。水化学的二级异常(Ⅱ₂)也钻出了工业油流。这是对地球化学法勘探油气田有效性的有力验证。

THE EFFECT OF SOIL-ADSORBED HYDROCARBON INPETROLEUM GEOCHEMICAL PROSPECTING OFDONGMING DEPRESSION

Through a comparison of various indices of adsorbed hydrocarbon: it isfound that index of C₈⁺ is not affected by surface interfering factors, and itsanomalies might indicate the information of underground oil and gas. Using theC₈⁺ index, we have delineated five anomalies, of which No. I anomaly has ledto the discovery of oil flow of industrial significance through drilling, No. Ⅱtal No.Ⅲ anomalies show very great oil-gas exploration value, No. Ⅳ anomalyalso has certain exploration significance, but No. V seems of no explorationvalue. In addition, No. V geothermal anomaly has developed into an oil fieldcalled the Sanchunji oil field. Industrial oil flow was revealed through drillingat a 2nd grade hydrochemical anomaly (No. 2). These data provide convincingevidence for the effectiveness of the geochemical method in the explorationof oil-gas field.