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鄂尔多斯盆地三叠系延长组长7段发育优质烃源岩,通过对盆地西部盐56井长7段泥页岩系统取样及稀土元素室内测试分析,结果表明:盐56井长71、长72、长73段稀土元素总量较高,均明显高于北美页岩,∑LREE/∑HREE、La N/Yb N比值显示轻重稀土分异明显,REE配分模式为明显的轻稀土富集、重稀土平坦及显著Eu负异常右倾形态。根据REE配分模式,表明长7段泥页岩物源来自上地壳岩石;根据长7段各小层较高REE总量及Ceanom均大于-0.1,显示长7段沉积期气候温暖湿润且水体为还原环境,且长73沉积期气候更为湿润,水体还原性更强。
Through the sampling and analysis of the shale system in Chang 7 Member of the Yan 56 well in the western basin and the REE laboratory analysis, the results show that the length of salt well of Well No. 56 is 71, the length of 72, The total 73 REE fractions were higher than that of North American shales. ΣLREE / ΣHREE and La N / Yb N ratios indicated that the REE fractionations were obvious, REE patterns were obvious light rare earth enrichment, heavy REE Flat and significant Eu negative anomalies right-inclined form. According to the REE distribution pattern, the source rocks of the Chang 7 Member shale come from the upper crust. According to the total REEs and the Ceanom of Chang 7 Member, the total REEs and Ceanom are both larger than -0.1, indicating that the climate in the Chang 7 Member is warm and humid and the water body is Restore the environment, and long 73 sedimentary climate is more humid, more reducing water.