现代地质
現代地質
현대지질
GEOSCIENCE-JOURNAL OF GRADUATE SCHOOL CHINA UNIVERSITY OF GEOSCIENCES
2013年
5期
1058-1069
,共12页
贾海波%季汉成%吴智平%李伟%张宏国%王政凯
賈海波%季漢成%吳智平%李偉%張宏國%王政凱
가해파%계한성%오지평%리위%장굉국%왕정개
沉积体系%物源方向%红层沉积期%东营凹陷
沉積體繫%物源方嚮%紅層沉積期%東營凹陷
침적체계%물원방향%홍층침적기%동영요함
sedimentary system%provenance orientation%red-bed sedimentary period%Dongying Sag
在对地质资料、地震资料及地球化学资料详细解剖的基础上,以东营凹陷西部红层沉积期构造演化阶段的划分及古地貌的恢复为切入点,通过对物源、沉积体系的系统研究,明确了东营凹陷西部红层沉积期物源方向及沉积体系的时空演化特征。研究认为:东营凹陷西部红层沉积期可以划分为孔一段时期和沙四下亚段时期两个构造演化阶段;红层沉积前盆地整体呈现四面环凸、西高东低、西部地形整体较为平缓的古地貌格局,古地貌的时空差异影响并控制了东营凹陷西部红层层系的沉积。东营凹陷西部红层沉积期存在西北无棣-滨县凸起和南部鲁西隆起两大远物源体系和平南断层上升盘近物源体系,红层沉积后期,平南断层上升盘近物源体系消失。东营凹陷西部红层沉积期主要发育了冲积扇、辫状河、湖泊及滩坝等沉积体系,盆地北部还发育了近岸水下扇沉积体系;古地貌、古物源及古气候的变迁使得沉积体系的时空展布表现出继承性与差异性并存的特征。
在對地質資料、地震資料及地毬化學資料詳細解剖的基礎上,以東營凹陷西部紅層沉積期構造縯化階段的劃分及古地貌的恢複為切入點,通過對物源、沉積體繫的繫統研究,明確瞭東營凹陷西部紅層沉積期物源方嚮及沉積體繫的時空縯化特徵。研究認為:東營凹陷西部紅層沉積期可以劃分為孔一段時期和沙四下亞段時期兩箇構造縯化階段;紅層沉積前盆地整體呈現四麵環凸、西高東低、西部地形整體較為平緩的古地貌格跼,古地貌的時空差異影響併控製瞭東營凹陷西部紅層層繫的沉積。東營凹陷西部紅層沉積期存在西北無棣-濱縣凸起和南部魯西隆起兩大遠物源體繫和平南斷層上升盤近物源體繫,紅層沉積後期,平南斷層上升盤近物源體繫消失。東營凹陷西部紅層沉積期主要髮育瞭遲積扇、辮狀河、湖泊及灘壩等沉積體繫,盆地北部還髮育瞭近岸水下扇沉積體繫;古地貌、古物源及古氣候的變遷使得沉積體繫的時空展佈錶現齣繼承性與差異性併存的特徵。
재대지질자료、지진자료급지구화학자료상세해부적기출상,이동영요함서부홍층침적기구조연화계단적화분급고지모적회복위절입점,통과대물원、침적체계적계통연구,명학료동영요함서부홍층침적기물원방향급침적체계적시공연화특정。연구인위:동영요함서부홍층침적기가이화분위공일단시기화사사하아단시기량개구조연화계단;홍층침적전분지정체정현사면배철、서고동저、서부지형정체교위평완적고지모격국,고지모적시공차이영향병공제료동영요함서부홍층층계적침적。동영요함서부홍층침적기존재서북무체-빈현철기화남부로서륭기량대원물원체계화평남단층상승반근물원체계,홍층침적후기,평남단층상승반근물원체계소실。동영요함서부홍층침적기주요발육료충적선、변상하、호박급탄패등침적체계,분지북부환발육료근안수하선침적체계;고지모、고물원급고기후적변천사득침적체계적시공전포표현출계승성여차이성병존적특정。
Based on the detailed analysis of geological data,seismic data and geochemical data,through the method of the dividing of structure evolution stages and recovery of palaeogeomorphic,combined with prove-nance sedimentary system,the paper studied the temporal and spatial evolution features of sedimentary system and provenance orientation in the red-bed sedimentary period in the western area of Dongying Sag.The period in the western area of Dongying Sag was divided into the 1 st of Kongdian Formation and the lower part of the 4th member of Shahejie Formation.Before deposition of the 1 st member of Kongdian Formation,the Luxi uplift, Guangrao bump,Chenjiazhuang bump,Binxian bump and Wudi bump were formed.The main faults are Chen-nan Fault,Binnan Fault,Yangxin Fault,Shicun Fault and Gaoqing-Pingnan Fault and so on.The whole basin presents the palaeogeomorphic of bumps around,east low,and west high and flat terrain in the west.The prove-nance of the western area of Dongying Sag in the early stage of Kongdian-Shasi is mainly from the northwest and the south orientations.There are two further provenance systems of Wudi to Binxian bump,Luxi uplift,and one provenance system of Pingnan Fault.There are sedimentary systems such as alluvial fan-braided river-lake sys-tem,alluvial fan-alluvial plain-lake system,lake-beach bar and subaqueous fan-lake system.The changes of palaeogeomorphic,provenance and ancient climate influence the temporal and spatial evolution of the sedimen-tary system with the characteristics of inheritance and difference.