鄂尔多斯盆地延长组长1段烃源岩有机地球化学特征

鄂尔多斯盆地三叠系延长组长1段发育一套深湖相浊积岩及数层暗色泥岩。根据实测的有机碳含量、可溶有机质及族组分含量、有机元素和同位素等数据可知,该泥岩为一套较好—好的烃源岩。镜质体反射率及生物标志化合物成熟度指标显示,该段烃源岩有机质处于低成熟到成熟阶段。该套烃源岩的发现为陕北地区寻找新的油气勘探目标提供了依据。

Organic geochemistry characteristics of hydrocarbon source rocks in the Member 1 of Upper Triassic Yanchang Formation, in Ordos Basin

Dark mudstones and the turbidites of deep lake facies were discovered recently in the Member 1 of Yanchang Formation,Upper Triassic in Ordos Basin.Through comparing the measured residual organic carbon,potential hydrocarbon generation amount,kerogen isotopes with the theoretical parameter,it was considered that in this region these dark mudstones are the fairly good or good source rocks.According to the vitrinite reflectance of dispersed organic matter and indexes of maturation of biomarkers the thermal evolution of organic matter in this area is of the characteristics of low-mature or mature.Restudying the source rocks in the Member 1 of Yanchang Formation provides some important message for finding new targets of the exploration of oil and gas in Shaanbei area in Ordos Basin.