龙门山推覆带形成演化与油气关系探讨  

Discussion on Forming Evolution of Longmenshan Nappe Zone and Its Oil/Gas Correlation

作　　者：罗啸泉[1] 李书兵[1] 

机构地区：[1]中国石化西南油气分公司勘探开发研究院,四川成都610081

出　　处：《天然气技术》2009年第1期16-18,共3页NATURAL GAS TECHNOLOGY

摘　　要：通过对龙门山推覆带的沉积响应研究表明,该构造带形成于印支中期,始于盆地须家河组第三段沉积之后,须家河组第四段有大量砾岩层,砾石主要为碳酸盐岩,来自于西侧的古生界海相沉积。构造变形时期具有北段早,南段晚;构造变形强度具有北段强、南段弱,西侧强、东侧弱的特征。龙门山前缘冲断褶皱带发育构造圈闭且圈闭面积大、闭合幅度高、断裂发育适中,为油气聚集和局部富集提供了有利条件,勘探潜力大。For Longmenshan nappe zone,a research on sedimentary response shows that this structural zone formed in middle Indo-Chinese epoch and was after a deposition of Xujiahe 3 Member.Xujiahe 4 Member consists of a lot of conglomerate beds,which include mainly carbonate rock from Paleozoic marine deposition in the western side.Structural time is characterized by an early deformation in north part and a late deformation in south part;in addition,its deformation is characterized by a strong intensity in north and west sides as well as a weak intensity in south and east sides.With high closure amplitude and moderately developed faults,the large structural trap develops at Longmenshan frontal thrust-fold belt,which may provide some favorable conditions for oil and gas accumulation.So,an exploration potential is large in this belt.

关 键 词：龙门山 推覆带 演化 油气 探讨 四川 西北 

分 类 号：P618.13[天文地球—矿床学]