现代地质
現代地質
현대지질
GEOSCIENCE-JOURNAL OF GRADUATE SCHOOL CHINA UNIVERSITY OF GEOSCIENCES
2014年
4期
799-805
,共7页
冉怀江%范乐元%胡圣利%尤征%金博
冉懷江%範樂元%鬍聖利%尤徵%金博
염부강%범악원%호골리%우정%금박
Muglad盆地%4区西斜坡%早白垩世%沉积层序%控制因素
Muglad盆地%4區西斜坡%早白堊世%沉積層序%控製因素
Muglad분지%4구서사파%조백성세%침적층서%공제인소
Muglad Basin%the western trend of block 4%Early Cretaceous%sedimentary sequence%controlling factor
苏丹Muglad盆地是重要的油气探区,受区域构造的影响,早白垩世沉积储层发育演化与构造演化密切相关。在盆内地震、测井及岩心资料综合分析的基础上,重点对4区西斜坡早白垩世的沉积层序特征及其控制因素进行了研究。结果表明:Muglad盆地经历了3次裂谷断陷活动及其后裂谷期的3次热沉降坳陷活动,形成了6个二级层序;在二级层序格架内将白垩系Abu Gabra组至古近系Adok组划分13个三级层序;早白垩世断陷期主要发育湖泊及辫状河三角洲沉积体系,坳陷期主要发育辫状河及三角洲沉积体系;断陷-坳陷的构造演化和同沉积断裂对不同期层序的沉积体系发育具有明显的控制作用。
囌丹Muglad盆地是重要的油氣探區,受區域構造的影響,早白堊世沉積儲層髮育縯化與構造縯化密切相關。在盆內地震、測井及巖心資料綜閤分析的基礎上,重點對4區西斜坡早白堊世的沉積層序特徵及其控製因素進行瞭研究。結果錶明:Muglad盆地經歷瞭3次裂穀斷陷活動及其後裂穀期的3次熱沉降坳陷活動,形成瞭6箇二級層序;在二級層序格架內將白堊繫Abu Gabra組至古近繫Adok組劃分13箇三級層序;早白堊世斷陷期主要髮育湖泊及辮狀河三角洲沉積體繫,坳陷期主要髮育辮狀河及三角洲沉積體繫;斷陷-坳陷的構造縯化和同沉積斷裂對不同期層序的沉積體繫髮育具有明顯的控製作用。
소단Muglad분지시중요적유기탐구,수구역구조적영향,조백성세침적저층발육연화여구조연화밀절상관。재분내지진、측정급암심자료종합분석적기출상,중점대4구서사파조백성세적침적층서특정급기공제인소진행료연구。결과표명:Muglad분지경력료3차렬곡단함활동급기후렬곡기적3차열침강요함활동,형성료6개이급층서;재이급층서격가내장백성계Abu Gabra조지고근계Adok조화분13개삼급층서;조백성세단함기주요발육호박급변상하삼각주침적체계,요함기주요발육변상하급삼각주침적체계;단함-요함적구조연화화동침적단렬대불동기층서적침적체계발육구유명현적공제작용。
Muglad Basin of Sudan is an important hydrocarbon accumulation zones,and influenced by the re-gional structure,the Early Cretaceous sedimentary reservoir developed evolution is closely related with tectonic evolution.On a basis of the comprehensive study of the seismic,well logging and core data,the characteristics of sedimentary sequence of the Early Cretaceous of the western trend of block 4 in Muglad Basin and its control-ling factors are studied.The main results and achievement are as follows:(1 )The basin has experienced three large rift movements and three thermal subsidence depression movements of post-rift stage,and formed 6 se-condary-order sequences.In those secondary-order sequence stratigraphic frameworks, the target formations from Cretaceous Abu Gabra to Paleogene Adok are divided into 13 third-order sequences;(2)Lacustrine and braided delta sedimentary systems mainly developed at rift stages,and braided river and delta sedimentary sys-tems mainly developed at sag stages;(3 )The study shows that the sedimentary systems development of different sequence are mainly controlled by the synsedimentary fault and tectonic evolution of rift and sag stages.