鄂尔多斯盆地南缘彬县-旬邑地区三叠系延长组长7油页岩地质特征

Geology of shale oil occurring in Chang7 of the Triassic Yanchang Formation in Binxian-Yijun area at the south margin of the Ordos Basin

鄂尔多斯盆地南部彬县-旬邑地区三叠系延长组油页岩形成于浅湖-半深湖的沉积环境中,属湖相油页岩。对彬县-旬邑地区油页岩勘探研究工作表明,研究区油页岩分布面积约1496km^(2),厚度介于1.43m-32.75m之间,整体埋藏深度介于0-440m之间。油页岩有机质丰度高,有机质类型为Ⅰ型和Ⅱ1型,成熟度为低成熟-成熟,生烃特性良好。油页岩平均含油率介于3.88-9.03%之间,整体为中品级油页岩。

Oil shale occurring in Chang7 of the Triassic Yanchang Formation in Binxian-Yijun area at the south margin of the Ordos Basin was accumulated in sedimentary environment of shallow-semi-deep lakes,belonging to a lake phase oil shale.The oil shale exploration in Binxian-Xunyi area shows that the distribution area of oil shale in the study area is about 1,496km2,with a thickness ranging between 1.43m and 32.75m and a overall burial depth ranging between 0 and 440m.Oil shale is rich in organic matter of type I and typeⅡ1,featuring in low maturity-mature and good hydrocarbon characteristics with average oil content ranging between 3.88%and 9.03%,and the overall medium grade oil shale..The average oil content of oil shale is between 3.88-9.03%,belonging to medium grade oil shale.