苏丹穆格莱德盆地X区西斜坡AG组——Tendi组沉积体系分析

Sedimentary system of Tendi Formation to AG Formation in the western slope of X block, Muglad Basin

利用古生物、岩心、测井及地震资料,分析了苏丹穆格莱德盆地X区西斜坡AG组—Tendi组的沉积体系类型及其演化。结果表明:受西部马特里格隆起南段物源的影响,苏丹穆格莱德盆地X区西斜坡早白垩世早期、晚白垩世和始新世表现为断陷湖盆沉积特征,自西向东依次发育三角洲与湖泊相沉积,早白垩世早期该区东部发育半深湖—深湖亚相沉积;早白垩世晚期、古新世和渐新世—上新世表现为坳陷湖盆沉积特征,河流沉积体系推进至该区西部,形成三角洲沉积体系,东部为滨浅湖亚相沉积。总之,穆格莱德盆地X区西斜坡沉积充填受区域构造活动影响,沉积演化表现出明显的规律性。

Based on the paleontolugy, cores, logs and seismic data, this paper analyzed the types and evoh, tion of sedimentary systems from Tendi Formation in Tertiary to AG Formation in Cretaceous in the western slope of X hloek in Muglad Basin. The result shows that influenced by the source of the south part of western Matelige uplift, the study area is with rift lake basin sedimentary characteristics in Early Cretaceous, Late Cretaceous, and Eocene; the distribution from delta fa（.ies to shallow lake facies extends from west to east; in addition, （semi-） deep lake facies develops in the eastern part of the study area in the early stage of Early Cretaceous. The depression lacustrine deposition is manifested in the late period of Early Cretaceous, Paleocene and Oligocene-Pliocene. The fluvial facies promotes to the west of the study area and comes into being delta, and a small range of shallow lake occurs in the east of the study area. In conclusion, the regional tectonic activities significantly control the sedimentary filling in the western slope of X block in Muglad Basin, and the sedimentary evolution shows obvious regularity.