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中文摘要：
沉积盆地的地温场特征是油气勘探研究的重要内容之一。油气勘探工作者习惯于采用地温梯度而不是大地热流来描述沉积盆地的热状态，但是，地温梯度与计算井段密切相关，离开计算井段去谈地温梯度高低，很容易引起误解，尤其是在测温井段较短或测温深度较浅时，测温数据不能直接用于计算沉积盆地的地温梯度，否则，会得出错误的结论。然而，在实际研究工作中，这一点经常被忽视。为此，本文提出了“规-化”地温梯度的概念和计算方法，并以实例说明沉积盆地地温场研究中，采用“规-化”地温梯度来描述盆地热状态平面分布特征的必要性。
英文摘要：
Geothermal survey is an important tool in petroleum exploration. Among the geothermal parameters, the geothermal gradient is more often used by petroleum geologist because the hydrocarbon generation of source rocks is directly associated with temperature. However, the measured geothermal gradient data originated from diverse depth range, make spatial comparison a challenging task. In the conventional study of geothermal field of sedimentary basins unfortunately, the fact that geothermal gradient is depth-dependant is often ignored. A ＂uniform＂ geothermal gradient method is brought forward in this paper and a case study is carried out in order to demonstrate the necessity of this method in studying the spatial distribution of geothermal gradient of sedimentary basins.
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Formation mechanism of carbonate cemented zones adjacent to the top overpressured surface in the cen
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