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安岳～威东地区须家河组低渗储层中普遍发育低阻油气层,其成因类型多样、识别难度大。针对这一问题,利用岩心分析化验资料,结合低阻油气层测井响应特征,综合分析认为,造成该地区低渗低阻油气层的主要因素为:①高不动水饱和度;②高地层水矿化度;③低幅度构造背景引起气水分异差;④复杂的孔隙结构造成油气运移对地层水驱替不彻底,残留大量地层水。此外,局部富集导电矿物和钻井液侵入进一步降低了油气层的电阻率。弄清了低渗背景下发育的低阻油气层形成机理,探索出低阻变化规律及其与储层物性之间的关系,为准确识别和评价低阻油气层提供有利的依据,这也为下一步勘探开发奠定可靠的地质基础。
Low resistivity hydrocarbon reservoirs generally develop in the low permeability reservoirs of Anyjiahe Formation in Anyue ~ Weidong area, and their genetic types are diverse and difficult to identify. In response to this problem, the core analysis of laboratory data, combined with the logging response characteristics of low resistivity oil and gas reservoir, the comprehensive analysis shows that the main factors causing the low permeability and low resistivity oil and gas reservoir in this area are: ① high water saturation; ② high formation Water salinity; ③ low amplitude tectonic setting causes gas-water disparity; ④ complex pore structure causes hydrocarbon migration not to completely displace formation water, leaving a large amount of formation water. In addition, the local enrichment of conductive minerals and drilling fluid intrusion further reduces the resistivity of the reservoir. The formation mechanism of low resistivity oil-gas reservoir developed under low-permeability background was clarified, and the relationship between low-resistance change law and reservoir physical property was explored to provide favorable basis for accurate identification and evaluation of low-resistivity oil-gas reservoir. Next exploration and development to establish a reliable geological foundation.