苏北东台坳陷地温与油气的关系

THE RELATION BETWEEN PETROLEUM AND GEOTHERM IN THE DONGTAI DEPRESSION,NORTHERN JIANGSU

费富安 刘培华

Fei Fuan Liu Peihua

地温是控制石油生成及其演化的主要因素之一。近十多年来国内外石油地质工作者都十分重视地温的研究,发现好多地区油气田的分布与一定的地温异常有关。所以研究含油气盆地的区域地温特点,对认识成油规律、石油区域远景评价和指导油气勘探都具有一定的意义。

In this paper,theoretical calculations of the geothermal data on 55 wellsin the Dongtai depression are made.The results obtained are identicalto those obtained from measurements of the organic geochemical evolution.It has been established that the range of the threshold temperatures for oilgeneration in the area is between 90—166℃(i.e.mature sphere),and found that the distribution of the oil-gas fields in the area is closely relatedto the anomalous area with geothermal gradients ranging from 3.5-4.0℃per 100M.This shows that the anomalous area is the most favourable areafor oil-gas concentration.The threshold oil-generating depths calculated from the above-mentioned threshold oil-generating temperatures in the area are between 2000 and 4000 M.The prediction and evaluation of the oil-gas prospects in the area showthat there seem to be still considerable potential oil and gas within thethreshold depths in the area that have not been struck by drill holes and that large amounts of condensing oil and gas below the threshold depthremain to be discovered.

10.11743/ogg19810103