摘要
Abstract
In recent years,the exploration of Linhe Depression in Hetao Basin has made important discoveries,and proved reserves of 100 million tons have been realized,but different structures have obvious different reservoir siz-es.In order to understand relationship between structural ridges and hydrocarbon accumulation and enrichment,based on regional geological,seismic and drilling data,combined with structural evolution analysis,the main ge-netic patterns of structural ridges and their controlling effects on hydrocarbon accumulation elements are studied.The results show that structural ridges of Linhe Depression are very developed,and their formation are mainly relat-ed to fault activities.Their genesis are divided into 4 patterns including nose ridge,faulted anticlinal ridge,fault block ridge and transitional ridge.According to their scale,they are divided into 2 types including large structural ridge and small structural ridge,while small structural ridge is usually secondary structural ridge developed on the background of large structural ridge.In the process of formation,structural ridges have strong controlling effect on 2 elements of"migration and trap",and are favorable carriers for coupling of migration and trap.In the process of ac-cumulation,large structural ridges,small structural ridges and hydrocarbon generation kitchen are spatially config-ured with each other,forming"source-sink-accumulation"relay pattern of hydrocarbon migration and accumula-tion.Source rock provides oil source,large structural ridges provide favorable convergence background,and small structural ridges provide oil and accumulation site.On large structural ridges which have good configuration relation-ship with source rocks,the closer the small structural ridges are to the trough,the more abundant the oil source condition is,and the more oil and gas are enriched.The research provides theoretical guidance for further oil and gas exploration of Linhe Depression.关键词
河套盆地/临河坳陷/构造脊/成因模式/油气成藏Key words
Hetao Basin/Linhe Depression/structural ridge/genetic pattern/oil and gas accumulation分类
能源科技
