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在大量岩心观察和精细描述、普通薄片鉴定和铸体薄片图像分析的基础上,本文结合储层物性分析,对塔河油田二区奥陶系储层发育控制因素进行了详细的研究。研究表明,塔河油田二区奥陶系以结晶灰岩为主的储层,基质物性较差,主要为低孔低渗缝洞型储层,溶蚀孔、裂缝和大型溶洞为其主要的储集空间。沉积岩性的差异是研究区南北部储层发育不同的基础,溶蚀作用以及构造运动进一步改善储层的渗流能力和储集性能,白云石化作用也为油气提供有利的储集空间。
On the basis of a large number of core observations and detailed descriptions, general sheet identification and casting sheet image analysis, this paper studies in detail the controlling factors of Ordovician reservoir development in the second member of the Tahe Oilfield based on reservoir physical property analysis. The results show that the Ordovician reservoir in the second member of Tahe Oilfield is dominated by crystalline limestone and has poor matrix physical properties. The reservoir is mainly composed of low porosity and low permeability fractured vuggy reservoirs. The dissolution pores, fractures and large cavities are the main reservoirs Set space. The difference of sedimentary lithology is the basis of different reservoir development in the north and south of the study area. The dissolution and tectonic movement further improve the seepage capacity and reservoir performance of the reservoir, and dolomitization also provides favorable reservoir space for oil and gas accumulation.