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A hydrocarbon indicator (HCI) or direct hydrocarbon indicator (DHI), is an anomalous seismic attribute value or pattern that could be explained by the presence of hydrocarbons in an oil or gas reservoir. DHIs are particularly useful in hydrocarbon exploration for reducing the geological risk of exploration wells. Broadly, geophysicists recognize several types of DHI: Some geoscientists regard amplitude versus offset anomalies as a type of direct hydrocarbon indicator. For example, the amplitude of a reflection might increase with the angle of incidence, a possible indicator of natural gas.

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  • Hydrocarbon indicator (en)
  • 碳氫化合物標識 (zh)
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  • 碳氫化合物標識(HCI) （英語：Hydrocarbon indicator） 或直接碳氫化合物標識 (DHI) 是指，由於油氣藏中含有碳氫化合物，而引起的一種異常的地震屬性或格局。 DHI 在油氣勘探中特別有用，可降低勘探井的地質風險。地球物理學家認識到幾種類型的 DHI如下： 地震亮點：在地震剖面上顯示局部地震波幅度大於背景幅度值。由於在1970 年代之前的地震資料處理程序中，有自動增益的程式，所以地震亮點在地震剖面上被遮蓋了 。 地震平點：穿越地層反射面的一種幾乎水平的反射面，代表油氣藏中的油氣地下水的界面。 地震暗點 ：地震波低幅度異常。 極性反轉：由於蓋層地震速度略低於油氣儲層，所以其界面反射，與蓋層和水層界面反射信號反轉 . 一些地球科學家將振幅随偏移距的变化視為一種直接的碳氫化合物標識。例如，反射的振幅可能會隨著入射角的增加而增加，這可能是天然氣的一個指標。 (zh)
  • A hydrocarbon indicator (HCI) or direct hydrocarbon indicator (DHI), is an anomalous seismic attribute value or pattern that could be explained by the presence of hydrocarbons in an oil or gas reservoir. DHIs are particularly useful in hydrocarbon exploration for reducing the geological risk of exploration wells. Broadly, geophysicists recognize several types of DHI: Some geoscientists regard amplitude versus offset anomalies as a type of direct hydrocarbon indicator. For example, the amplitude of a reflection might increase with the angle of incidence, a possible indicator of natural gas. (en)
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  • A hydrocarbon indicator (HCI) or direct hydrocarbon indicator (DHI), is an anomalous seismic attribute value or pattern that could be explained by the presence of hydrocarbons in an oil or gas reservoir. DHIs are particularly useful in hydrocarbon exploration for reducing the geological risk of exploration wells. Broadly, geophysicists recognize several types of DHI: * Bright spots: localized amplitudes of greater magnitude than background amplitude values. Equipment prior to the 1970s had the bright spots obscured due to the automatic gain control. * Flat spots: nearly horizontal reflectors that cross existing stratigraphy, possibly indicating a hydrocarbon fluid level within an oil or gas reservoir. * Dim spots: low amplitude anomalies. * Polarity reversals can occur where the capping rock has a slightly lower seismic velocity than the reservoir and the reflection has its sign reversed. Some geoscientists regard amplitude versus offset anomalies as a type of direct hydrocarbon indicator. For example, the amplitude of a reflection might increase with the angle of incidence, a possible indicator of natural gas. (en)
  • 碳氫化合物標識(HCI) （英語：Hydrocarbon indicator） 或直接碳氫化合物標識 (DHI) 是指，由於油氣藏中含有碳氫化合物，而引起的一種異常的地震屬性或格局。 DHI 在油氣勘探中特別有用，可降低勘探井的地質風險。地球物理學家認識到幾種類型的 DHI如下： 地震亮點：在地震剖面上顯示局部地震波幅度大於背景幅度值。由於在1970 年代之前的地震資料處理程序中，有自動增益的程式，所以地震亮點在地震剖面上被遮蓋了 。 地震平點：穿越地層反射面的一種幾乎水平的反射面，代表油氣藏中的油氣地下水的界面。 地震暗點 ：地震波低幅度異常。 極性反轉：由於蓋層地震速度略低於油氣儲層，所以其界面反射，與蓋層和水層界面反射信號反轉 . 一些地球科學家將振幅随偏移距的变化視為一種直接的碳氫化合物標識。例如，反射的振幅可能會隨著入射角的增加而增加，這可能是天然氣的一個指標。 (zh)
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