塔里木盆地巴什托普构造带志留系、奥陶系油气藏预测

巴什托普构造带已经发现了石炭系的生物碎屑灰岩油藏,其烃源岩为寒武系—奥陶系海相碳酸盐岩层。推测油气运移必经之路上的志留系圈闭和奥陶系圈闭中可能存在油气藏。对巴什托普构造带石炭系以下志留系和奥陶系的分析表明,志留系下砂岩段与其上覆的红色泥岩段可以构成一个有利的储盖组合,下奥陶统石灰岩段有可能形成石灰岩岩溶并与其上覆志留系巨厚的暗色泥岩段组成一套储盖组合。在巴什托普构造带,在与油源沟通良好、构造圈闭有利的位置上,应该可以形成工业性油气藏。

Prediction of the Ordovician and Silurian Reservoirs within Baxtopu Fracture Belt in Tarim Basin

A Carboniferous bioclastic limestone oil reservoir has been discovered along the Baxtopu Fracture Belt in Markit Slope in Tarim Basin,The hydrocarbon source of the reservoir is the Cambrian-Ordovician Marine carbonate rocks.It is inferred that some reservoirs exist possibly in Silurian traps or Ordovician traps which are all in the only way of hydrocarbon migration. The study of Silurian and Ordovician rocks underlying Carbonif- erous rocks along Baxtopu Fracture Belt indicates that both the Silurian lower sandstone member and the overlying red mud- stone member can constitute a set of favorable reservoir-cap assemblage and both the Lower Ordovician karst limestone member and the overlying thick dark Silurian mudstone can constitute another set of reservoir-cap assemblage.It is sug- gested that some commercial reservoirs should be found at the places where favorable traps are connected with good hydro- carbon source along the belt.