鄂北什股壕地区盒1段储层控制因素分析及有利区预测

Control factors analysis and favourable target areas determined of Xiashihezi Formation at Shiguhao Region in North Ordos Basin

对鄂北什股壕地区盒1段储层岩石学、储层孔隙类型、储层物性以及孔隙结构等方面进行详细的研究,分析影响储层储集性能的主要因素。研究结果表明,什股壕地区盒1段为冲积扇沉积,储层岩石具有成分成熟度低,结构成熟度中等—低的特征,主要储集空间为次生粒间孔,基本渗流通道为微孔,是典型的低孔低渗储层;储层物性主要受母岩成分、沉积环境和成岩作用影响。根据盒1段储层的基本特征,确定什股壕地区盒1段有利勘探区均分布于辫状主分流水道发育区。

The main factors that affect storage and collection performance of reservoirs in He 1 of Lower Shihe- zi Formation in Shiguhao Region of Northern Ordos are carried out through detailed analysis of petrology, pore types, physical property and pore structures of reservoir. The results showed that alluvial fan deposit develop in He 1 of Lower Shihezi Formation in Shiguhao Region, the compositional maturity of reservoir rock is low, and texture maturity is middle-low, the reservoir space is mainly secondary intergranular pores with micro- throat is seepage channel, all of which responded to typical low porosity and low permeability reservoir. Parent rock composition, sedimentary environment and diagenesis influence physical property of reservoir. And favor- able prospecting area in Shiguhao Region is determined through analysis of reservoir characters in He 1 of Lower Shihezi Formation.