摘要
上二叠统梧桐沟组是准噶尔盆地吉木萨尔凹陷重要的含油气层系之一,梧一段是主要产油层,为满足梧桐沟组深化勘探的需要,开展了吉木萨尔凹陷梧一段5个砂层组沉积相和梧一段沉积演化规律研究。研究结果表明:梧一段不同沉积期发育了多个继承性辫状河三角洲,首次识别出吉15井西和吉南辫状河三角洲以及北三台凸起西南坡和三台古隆起周边小规模扇三角洲;梧一段继承性辫状河三角洲随着水体的不断扩张,逐渐向远离沉积中心的凹陷边缘迁移,有利于岩性圈闭的形成,不同期次的辫状河三角洲之间向上呈退积叠置关系,下部砂层组的砂体主要分布在凹陷中心部位,上部砂层组的砂体主要分布于凹陷边缘部位。
The Wutonggou formation of Upper Permian is one of the important hydrocarbon sequences in Jimusaer sag of Junggar basin, and the Wu- 1 member is the main oil producing zone. In this paper, five sand layers and sedimentary evolution laws of the Wu- 1 member were studied for the purpose of the requirements of deepening petroleum exploration. The results show that there are several inherited braid- ed river deltas developed in different stages of Wu-1 member episode, and Ji-15 well west and Jinan inherited braided river deltas as well as Beisantai swell southwest slope and Santai paleo-uplift small-scale fan deltas are identified for the first time. Along with lake extension, the inherited braided river deltas of Wu-1 member moved away from the sedimentary center, which were favorable for formation of litholog- ic traps surrounding Jimusaer sag. The inherited braided river deltas developed in different stages have the retrograding contact relations among them, and the sand bodies of the lower sand layers are distributed in the central of the sag, while the sand bodies of the upper sand layers are distributed around the sag margin.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2015年第2期169-173,213,共6页
Xinjiang Petroleum Geology
关键词
准噶尔盆地
吉木萨尔凹陷
梧桐沟组
梧一段
沉积相
辫状河三角洲
沉积演化
Junggar basin
Jimusaer sag
Wutonggou formation
Wu-1 member
sedimentary facies
braided river delta
sedimentary evolution
