應用震測間隔速度推求地層中油母質之成熟度

地層中油母質的成熟度與地層在深埋過程中所受之溫度及受熱之時間關係非常密切；而震測間隔速度（V_(INT)）與地層的熱傳導係數（K）間又有以下之關係：K=1.02+1.24V_(INT)本研究卽利用震測間隔速度與熱傳導係數間之關係求出地層的熱流量，再由地層受熱之温度、時間求出其與生油岩成熟度間之關係，期能在未打井前由震測間隔速度預測地層中油母質的成熟度。文中並以電測之井底温度由電腦做線性迴歸，求出臺灣區陸上之平均地溫梯度與地表溫度；其平均地溫梯度為31.94°C／KM，平均地表溫度為25°C（77°F）。本文也利用鑽井後之聲波電測來求各地層的間隔速度及各地區之平均熱傳導係數，並配合電測之井底溫度求出各井之平均地溫梯度，以及各地區之平均熱流量，發現臺灣北部之平均熱流量較北港高區之平均熱流量高，而且北部陸上之生油岩進入油窗之時間也比南部早。以佳里地區測線70-CLI-D1之震測剖面為例，將運算與應用之方法做詳盡之解釋，希望本方法能對油氣探勘有直接助益。

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並列摘要

The maturation of kerogen is related closely to the heating temperature and time of the formation during its burial. The relation between interval velocity (V_(INT)) and heat conductivity (K) is shown as below: K=1.02+1.24 V_(INT) From the above equation, we can calculate the heat conductivity and the heat flow from the interval velocity. Then we find out the relations among kerogen maturation, the heating temperature, and the heating time. According to the results of the studies, we can predicted the kerogen maturation directly by the interval velocity instead of geochemical methods with drilling cuttings, We also collectd bottom hole temperature data to do linear regression for thermal gradient with the computer. The average geothermal gradient is 31.94°C km and the average surface temperature is 25°C (77°F) for onshore Taiwan. We also used Sonic log to calculate the interval velocity for each formation and to calculate the heat flow of various districts. We find that the heat flow of northern Taiwan is higher than that of around the Peikang High and the time for the source rock of northern Taiwan to enter the oil window is much earlier than that for southern Taiwan. The seismic profile of Line-70-CLI-D1 has been given as an example to specify the calculation and its application. It is hoped that this method of prediction would be helpful to the hydrocarbon exploration.

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