利用钻孔编录、荧光检测、氯仿沥青"A"测定、X衍射、孔渗测试、扫描电镜、压汞实验等手段,通过分析储层厚度及含油性、矿物成分组成、孔渗特征与孔隙结构特征研究谭庄组储层特征,并从成藏原动力、储集空间和保存条件3个方面着手探讨伊川凹陷谭庄组致密油成藏条件.研究结果表明:谭庄组含油段厚度大、含油性强,矿物成分以黏土矿物和脆性矿物为主,孔隙类型包括矿物粒间孔、矿物溶蚀孔及粒间孔-溶蚀孔混合类型,为微纳米孔隙广泛发育的低孔、低渗致密油储层;致密油成藏原动力为源储紧密接触产生的生烃增压作用,储集空间主要为微纳米孔隙,整体保存条件较好.伊川东北部韦村—彭婆一带可能为谭庄组致密油开发甜点区块.推测以伊川凹陷、宜阳北部及洛阳周边为重点区块的豫西地区谭庄组致密油潜力巨大.%Drill hole record,fluorescence detection,chloroform bitumen"A"measurement,X radial diffraction, permeability and porosity test,scanning electron microscope and mercury injection method are used to analyze res-ervoir thickness,mineral composition,permeability and porosity characteristics and pore structure characteristics, so as to investigate reservoir characteristics of Tanzhuang formation. Tight oil reservoir accumulation conditions are investigated in three aspects including original driving force for reservoir accumulation,reservoir space and preser-vation condition. The research results show that oil bearing rock in Tanzhuang formation has large thickness and good oil bearing properties,where clay mineral and brittle mineral are major minerals and pore type includes interg-ranular pore,corrosion pore and intergranular pore- corrosion pore. It's a low porosity low permeability tight oil reservoir where micro-nano pores are widely developed. Original driving force for tight oil is hydrocarbon pressure increasing effect caused by close contact of source rock and reservoir rock. Micro-nano pores act as major reservoir space. Overall preservation condition is favorable. Weicun-Pengpo belt in the northeast of Yichuan may be sweet spot block for tight oil development in Tanzhuang formation. It is speculated that huge tight oil potential exists in Tanzhuang formation in Yuxi district,where Yichuan depression,North Yiyang and areas around Luoyang are key blocks.
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