大民屯凹陷太古宇潜山岩性与储层条件分析

Analysis on the lithology and reservoir conditions of Archaeozoic buried hill in Damintun Depression

裂缝是太古宇油气藏的主要储集空间,而控制裂缝发育程度的主要因素是岩性与构造应力,岩性是裂缝发育的内部控制因素[1]。通过岩石矿物组成、测井响应特征、岩石含油气显示统计、造岩元素分析等手段,总结本区裂缝较发育的岩石类型主要为长英质岩相,与之相对应的铁镁质岩相裂缝不发育,具有隔层性质,可作为局部盖层。这一研究成果,对于寻找潜山内幕油藏具有现实意义。

Fracture is the main reservoir space of Archaeozoic oil and gas reservoir,and the main factors controlling the fracture development are lithology and structural stress,and lithology is the internal control factor of fracture development [1]. By means of rock mineral composition,logging response characteristics,statistics of petroliferous display,analysis of rock forming elements,etc,It is concluded that felsic facies is the main rock type with developed fractures in this area,and the corresponding FE Mg facies fracture is not developed,which has the nature of interlayer and can be used as local caprock. This research result has practical significance for finding buried hill inner reservoir.