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鄂尔多斯盆地西南部的环江地区,延长组长2油层组的储层特征为中低孔、低渗型,具有比较低的含油饱和度,在测井响应中,油气产生的影响因子小,导致Rt/Ro<2.0,呈显典型得低阻油藏特征,这样就会造成通过电性资料来识别油气层的能力大大的降低了。研究认为,研究区油水重力分异作用、孔隙结构、岩石骨架粒度分布、黏土矿物含量较高导致的高束缚水饱和度是形成低阻油层的重要因素。通过对环江地区动、静态资料的分析,充分考虑该区低阻油层成因,提出适合该区的和测井新技术来识别低阻油层。
The reservoir characteristics of Chang 2 reservoir in Yanchang Formation are characterized by low porosity and low permeability and relatively low oil saturation in the Huanjiang area in the southwestern Ordos Basin. In logging response, the influence factors of hydrocarbon generation are small, resulting in Rt / Ro <2.0, showing a typical low-resistivity reservoir characteristics, which will result in the ability to identify the hydrocarbon layer by electrical data greatly reduced. The research shows that the high irreducible water saturation caused by the gravitational differentiation of oil and water, the pore structure, the particle size distribution of rock framework and the high content of clay minerals in the study area are important factors for the formation of low-resistivity reservoirs. Based on the analysis of the dynamic and static data in the Huanjiang area, the cause of low-resistivity reservoirs in this area is fully considered, and a new well-logging technique suitable for this area is proposed to identify the low-resistivity reservoirs.