摘要
油气物性、碳同位素及生物标志化合物等地球化学指标表明,玛湖凹陷西南部与东北部油气物性及地球化学特征以玛湖凹陷为中心,呈镜像对称.东、西斜坡区油气主要分布在二叠系,油气成熟度纵向上存在差异.上部为高成熟度轻质油气,底部油气或残留沥青成熟度低;远离生烃凹陷西南缘克拉玛依超覆尖灭带、东北部陆 4 井区等油气处于相同演化阶段,为成熟油气.油气地球化学特征性相似性与成藏多期性及油气运移对称性密切相关.预测玛东古隆起带之上的侏罗系、白垩系是寻找早期成熟油气的现实层位.
s:According to the geochemical index including petroleum properties, stable carbon isotopic, and biomarkers, the petroleum properties and geochemistry in the southwest and northeast parts of the Mahu depression are symmetrically mirrored. In the slope zone oil is mainly concentrated in the Permian. Variations in density and geochemistry are seen along the vertical section with high matured oil occurring at the bottom and less mature to mature oil in the upper part. Maturation of petroleum in the inlap-pinch Zones and in Lu 4 are at the same stage of evolution and have the same geochemical properties and geochemistry. Mirror symmetry of petroleum occurrences is due to multistage-accumulation and remigration. We predicted petroleum occurred in Jurassic and Cretaceous.
出处
《新疆地质》
CAS
CSCD
2004年第4期412-416,共5页
Xinjiang Geology
