摘要
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。
The material evidence of alteralization related to hydrocarbon migration from soil on surface and rock of oil generation strata,oil reservoirs and cap strata from oil wells has been obtained according to synthetic analysis of magnetic(susceptibility,magnetic hysteresis and thermal magnetic analysis)and mineralogy(heavy mineral,electron probe and scanning electric microscopy)of rock cut tings and cores from S 4,S 7 and S 15 wells in Yakela oil field and S 6 well on oil and water boundary in Tarim Basin.Predominent alteralizations are magnetite mineralization and siderite mineralization in the oil field,but predominent pyrrhotite mineralization is found on oil and water boundary.The intensity of“chimney like effect”decreases with on the decrease in depth but its magnetic and mineralogic anomalises related to hydrocarbon migration on the surface can still be identified.Therefore,this is of great significances for oil and gas reservoirs evaluation.Spherical magnetite grains have been found within rocks of oil producing strata and mantle rocks and the low content high temperature foreign elements indicates that the authigenic magnetite is related to hydrocarbon microseepage.
出处
《地球科学（中国地质大学学报）》
CSCD
北大核心
1996年第1期93-98,共6页
Earth Science-Journal of China University of Geosciences
基金
国家自然科学基金
地质行业科学技术发展基金
国家"八五"重点科技攻关项目
关键词
烟筒效应
电子探针
油气藏
磁学
矿物学
chimney like effect
magnetic hysteresis loop
Curie point
electron probe
SEM
oil reservoir
Yakela
Tarim Basin.
