莺歌海盆地莺东斜坡带南段中深层断裂特征及控藏作用
周杰 , 胡林 , 胡高伟 , 廖俊 , 郭璃 , 刘政
地球科学 ›› 2023, Vol. 48 ›› Issue (08) : 3021 -3030.
莺歌海盆地莺东斜坡带南段中深层断裂特征及控藏作用
Characteristics of Middle-Deep Faults in the Southern Segment of the Eastern Belt of Yinggehai Basin and Their Controlling Effect on Natural Gas Accumulation
为了明确莺东斜坡带南段中深层断裂特征及其对天然气成藏控制作用,基于新三维地震资料,首次对莺东斜坡带南段中深层断裂进行了精细刻画. 结合区域构造演化特征,分析了断裂类型、形态及活动性,探讨断裂对天然气成藏的控制作用. 结果表明,渐新世-早中新世莺歌海盆地处于左行走滑引起的构造变形应力场中,莺东斜坡带南段位于①号断裂走滑转换带,发育3组NW-SE走向,具左行右阶特征的张扭(局部压扭)走滑断裂. 剖面上三组断裂自北向南呈断阶状样式,断层产状陡直,局部表现为花状构造;断裂主要为3期活动:(1)始新世-早渐新世,(2)晚渐新世早中期,(3)早中新世;具有“早断早衰”的特征. 莺东斜坡带南段中深层断裂多期活动控制了崖城组陆源三角洲及烃源的发育,“二台阶”聚气背景的形成、三亚组砂体空间展布和圈闭的形成. 莺东斜坡带南段天然气生、运、聚匹配良好,有望成为莺歌海盆地下一个千亿方级的天然气聚集区.
莺歌海盆地 / 莺东斜坡带 / 断裂 / 中深层 / 天然气成藏 / 石油地质
Yinggehai Basin / the eastern belt of Yinggehai Basin / faults / middle-deep layer / natural gas accumulation / petroleum geology
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有限公司科技项目课题《南海西部近海大中型天然气田勘探潜力与突破方向》
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