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依据位于塔北雅克拉油气田内的沙田井、沙七井、沙十五井及位于油水边界的沙六井岩屑与岩心的磁学（包括磁化率、磁滞回线及热磁分析）与矿物学（包括重矿物、电子探针及扫描电子显微镜）的综合分析测试结果，获得了已知油气井内生、储、盖层与地表第四纪土壤中与烃运移相关的蚀变矿化作用（即烟筒效应）的物质证据．本区位于油气藏上方的蚀变矿化作用以磁铁矿化与菱铁矿化作用为主；而位于油水边界处的沙六井则以磁铁矿化与黄铁矿化为主．随着地层深度的减小，虽然“烟筒效应”的强度明显减北，但在地表仍可检测到明显的磁学与矿物学异常．综合磁学与矿物学研究结果表明，本区岩屑中发现的球粒状磁铁矿是“烟筒效应”的产物，它是与烃运移相关的次生低温磁性矿物重要的形貌特征
According to the magnetic properties (including susceptibility, magnetic hysteresis loop and thermal analysis) of Sha Tichang, Shak 7 and Sha 15 wells located in the Yacla Oil and Gas Field in Tarim Basin and the shale and core of the Shaliu well located at the oil-water boundary, (Including heavy minerals, electronic probes and scanning electron microscopy) to obtain the known mineralization of hydrocarbon migration related to the endogenous, reservoir and caprock of the oil and gas wells and the Quaternary soil on the surface (Ie, chimney effect) material evidence. The alteration mineralization above the reservoir is dominated by magnetite mineralization and siderite mineralization while the Shaliu well located at the oil-water boundary is dominated by magnetite mineralization and pyrite mineralization. As the depth of the strata decreases, significant “magnetocities” and mineralogical anomalies can still be detected on the surface, although the intensity of the “chimney effect” is significantly reduced. The results of comprehensive magnetism and mineralogy show that the spheroidal magnetite found in the cuttings of this area is the product of “chimney effect” and is an important morphological feature of secondary low-temperature magnetic minerals related to hydrocarbon migration