根据天然气组成、轻烃指纹和组分碳同位素分析资料，对松辽盆地三站气田天然气成因类型及演化程度研究后认为，该气田天然气是腐殖型和腐泥型的混合成因气，具有过成熟演化特征。根据三站气田烃源岩空间分布及天然气地球化学特征，选择青山口组、登娄库组、营城组、沙河子组和火石岭组的烃源岩样品，利用烃源岩吸附气轻烃指纹特征参数表征了这5套烃源岩，并通过数学模拟训练方法建立了计算模板，模拟计算了这5套烃源岩对每口井天然气的贡献，结果表明，每套烃源岩对不同井天然气贡献有差别，深层沙河子组烃源岩平均贡献60．5％，中浅层青山口组烃源岩平均贡献9．9％。

According to the analytical datum of component carbon isotope and components and light hydrocarbon fingerprint natural gas, Sanzhan gas field genetic type and evolution degree of natural gas form research are think, natural gas are hybrid origin form humic-type and propelic-type organic matters. and is in over-mature evolution stage. According to gas geochemistry characteristic and source rocks distribution feature in Sanzhan gas fields, choose to source rocks specimens in Qingshankou Fm, Denglouku Fm,Yingcheng Fm, Shanhezi Fm and Hushiling Fm, five suits hydrocarbon source rocks is characterized by using the hydrocarbon fingerprint characteristic parameter of hydrocarbon source rocks, and the calculate model using mathematical simulation method. The ration contribution adjust per mouthful of well of natural gas from five suits of hydrocarbon source rocks to analog computation. Result makes known, per suit of hydrocarbon source rocks is contributed the disparity to the distinct well natural gas, Average contributions of deep layer in Shahezi Fm and middle-shallow layer in Qingshankou Fm hydrocarbon source rocks are 60. 5% and 9.9%. First obtaining natural gas ration source from Sanzhan gas fields.