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。