鄂尔多斯盆地胡尖山地区延长组烃源岩分析

Analysis of source rock of Yanchang formation in Hujianshan area,Ordos Basin

把原油分为A,B和A-B三类,考察鄂尔多斯盆地胡尖山地区长4+5段和长6段的原油特征。结果表明:A类原油样品最多,在各层段均有分布;B类和A-B类原油样品相对要少,分布层位局限,主要分布在长61段和长4+5段中;长7段烃源岩是A类原油的主要贡献者,垂向运移距离相对较大;B类原油主要来自长6段和长4+5段烃源岩,长7段烃源岩也有贡献;长7段烃源岩是研究区的主要烃源岩,长6段和长4+5段可以作为次要烃源岩;长6段和长4+5段烃源岩生成的原油聚集的油藏是勘探的重要方向。

Through the crude oil feature analysis of the member Chang 4＋5 and the member Chang 6 of upper Triassic system in Hujianshan area of Ordos Basin,the crude oil was divided into three types including type A,type B and type A-B.Type A oil has large quantity and distributes in all formations,type B and typeA-B oil distribute relatively little and mainly appear at the member Chang 61 and Chang 4＋5.The member Chang 7 whose vertical migration distance is relatively longer is the main source rock of type A oil.Meanwhile the type B oil mainly comes from the member Chang 6 and Chang 4＋5 and the member Chang7 has some contribution either.In all,the member Chang 7 is the important source rock,and the member Chang 6 and Chang 4＋5 are the subsidiary.The reservoir whose oil comes from source rocks in the member Chang 6 and Chang 4＋5 should be the later exploration emphasis.