Besides included within carbonate mineral (determined by the acidolysis desorbed hydrocarbon method), hydrocarbons existing in surface medium are also occluded in clay and other silicate mineral.

• 地表介质中存在的烃类除了包裹于碳酸盐矿物中（酸解烃法测量）外，还吸留于粘土等硅酸盐矿物中。