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未熟、低熟烃源岩中的脂肪酸赋存于抽提沥青和干酪根中, 沥青脂肪酸主要以酯键结合于沥青的非烃组分内, 干酪根脂肪酸以酯醚键结合于干酪根网络结构中, 有一部分是与干酪根网络结构结合更紧密的强干酪根脂肪酸. 辽河盆地与济阳拗陷未熟、低熟烃源岩的沥青脂肪酸含量在0.010 0%~0.073 9%, 干酪根脂肪酸为0.005 0%~0.045 5%, 强干酪根脂肪酸为0.000 5%~0.010 5%, 其中一元脂肪酸占70%~100%, 二元脂肪酸占0~30%, 羟基酸＜10%. 沥青中赋存的脂肪酸主要是一元脂肪酸, 碳数分布较宽, 碳链较长, 二元脂肪酸和羟基酸很少, 干酪根中含有较多二元脂肪酸和少量羟基酸, 碳数分布较窄, 碳链较短. 未熟、低熟烃源岩中的脂肪酸生烃作用, 主要依靠沥青一元脂肪酸.
The fatty acids in the immature and low-maturity source rocks occur in the extracted bitumen and kerogen. The bitumen fatty acids are mainly ester-bonded to the non-hydrocarbon components of the bitumen. The kernal fatty acids are ester-bonded to the network structure of kerogen , Some of them are stronger kerogens with kerogen network structure.The content of bitumen fatty acid in the immature and low maturity source rocks in Liaohe Basin and Jiyang depression is 0.010 0% -0.073 9%, the kerogen fatty acids are 0.005 0% to 0.045 5%, strong kerogen fatty acids 0.000 5% to 0.010 5%, of which 70% to 100% of monobasic fatty acids, 0 to 30% of binary fatty acids, hydroxy acids <10% Of fatty acids are mainly monobasic fatty acids, the carbon number distribution is wide, the carbon chain is longer, the bifunctional fatty acids and hydroxy acids are few, the kerogens contain more dibasic fatty acids and a few hydroxy acids, the carbon number distribution is narrower and the carbon chains are more Short, immature, low-maturity source rock fatty acid hydrocarbon generation, mainly rely on asphalt monobasic fatty acids.