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林镇地区是鄂尔多斯盆地中生界油气勘探新区,近几年在该地区发现了延长组上部和延安组下部的复合油藏。通过对鄂尔多斯盆地林镇地区原油样品和区域内烃源岩样品进行系统采集和GC-MS分析,研究了原油和烃源岩中生物标志化合物的组成和分布特征,探讨了延安组延6、延8、延9和延长组长3等油层组原油的成因;油源对比研究表明该地区延安组与延长组原油的地球化学特征均与上三叠统延长组长7烃源岩具有亲缘关系,说明原油主要来源于长7烃源岩。这些研究成果为林镇地区石油勘探开发提供了科学依据。
Linzhen area is the Mesozoic oil and gas exploration area in the Ordos Basin. In recent years, composite reservoirs have been discovered in the upper part of Yanchang Formation and the lower part of Yan’an Formation. Through the systematic collection and GC-MS analysis of crude oil samples and regional source rock samples in the Linzhen area of Ordos Basin, the composition and distribution characteristics of biomarkers in crude oil and source rocks were studied. The effects of Yan 6, 8, Yan 9 and Yanchang Formation 3 oil reservoirs. The oil source correlation analysis shows that the geochemical characteristics of the Yan’an and Yanchang Formation crude oil in the area are all related to the source rocks of Chang 7 Member of Yanchang Formation in Upper Triassic, It shows that crude oil mainly comes from Chang 7 source rock. These research results provide a scientific basis for petroleum exploration and development in Linzheng area.