C4-C7 alkenones in deep sea sediments
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It is believed that C4 to C7 hydrocarbons in petroleum are formed by the cracking of organic matter at depths generally exceeding 1,000 m at temperatures in excess of 50 °C...
学界普遍认为，石油中的C4至C7烃类（hydrocarbons）是有机质在通常超过1000米的深度、温度高于50℃的条件下经裂解作用形成的……
