新疆石油地质
新疆石油地質
신강석유지질
XINJIANG PETROLEUM GEOLOGY
2010年
1期
33-36
,共4页
马德波%李明%崔文娟%吴东旭%金银楠%孙甲庆
馬德波%李明%崔文娟%吳東旭%金銀楠%孫甲慶
마덕파%리명%최문연%오동욱%금은남%손갑경
鄂尔多斯盆地%陇东%延长组%浊积岩%高分辨率%层序地层学%分布规律
鄂爾多斯盆地%隴東%延長組%濁積巖%高分辨率%層序地層學%分佈規律
악이다사분지%롱동%연장조%탁적암%고분변솔%층서지층학%분포규률
Ordos basin%Longdong area%Yanchang formation%turbidite%high resolution%sequence stratigraphy%distribution rule
采用井-震结合的方法将鄂尔多斯盆地陇东地区延长组长6-长7段划分为1个长期基准面旋回和5个中期基准面旋回.研究区延长组长6-长7段浊积岩主要发育在中期基准面旋回下降半旋回的中晚期和上升半旋回的早期,分布于辫状河三角洲前缘前端斜坡及平原区古地形低洼处,其展布范围随长期基准面的下降逐渐向湖盆中部迁移,这种分布特征主要受控于4个因素:盆地及周缘大地构造背景在宏观上控制着浊积岩的发育;区域构造活动为浊积岩的发育提供了一定的触发机制;基准面旋回的变化控制着浊积岩的发育及分布范围;前三角洲地区古地貌决定三角洲前缘浊积体运移方向和沉积位置.陇东地区浊流沉积具有优越的成藏条件,是长庆油田增储上产的重要接替领域.
採用井-震結閤的方法將鄂爾多斯盆地隴東地區延長組長6-長7段劃分為1箇長期基準麵鏇迴和5箇中期基準麵鏇迴.研究區延長組長6-長7段濁積巖主要髮育在中期基準麵鏇迴下降半鏇迴的中晚期和上升半鏇迴的早期,分佈于辮狀河三角洲前緣前耑斜坡及平原區古地形低窪處,其展佈範圍隨長期基準麵的下降逐漸嚮湖盆中部遷移,這種分佈特徵主要受控于4箇因素:盆地及週緣大地構造揹景在宏觀上控製著濁積巖的髮育;區域構造活動為濁積巖的髮育提供瞭一定的觸髮機製;基準麵鏇迴的變化控製著濁積巖的髮育及分佈範圍;前三角洲地區古地貌決定三角洲前緣濁積體運移方嚮和沉積位置.隴東地區濁流沉積具有優越的成藏條件,是長慶油田增儲上產的重要接替領域.
채용정-진결합적방법장악이다사분지롱동지구연장조장6-장7단화분위1개장기기준면선회화5개중기기준면선회.연구구연장조장6-장7단탁적암주요발육재중기기준면선회하강반선회적중만기화상승반선회적조기,분포우변상하삼각주전연전단사파급평원구고지형저와처,기전포범위수장기기준면적하강축점향호분중부천이,저충분포특정주요수공우4개인소:분지급주연대지구조배경재굉관상공제착탁적암적발육;구역구조활동위탁적암적발육제공료일정적촉발궤제;기준면선회적변화공제착탁적암적발육급분포범위;전삼각주지구고지모결정삼각주전연탁적체운이방향화침적위치.롱동지구탁류침적구유우월적성장조건,시장경유전증저상산적중요접체영역.
Chang 6-Chang 7 members of Yanchang formation in Longdong area in Ordos basin are divided into a large scale base-level cycle and five medium scale base-level cycles by well-seismic integrated method. It is shown that in view of time the turbidites of the members are distributed in the middle-late period of the decline hemicycle and early period of-rising hemicycle of medium scale base-level cycles, and in view of space they are distributed in the basin slopes in front of braided river delta and the lowland of ancient topography in the basin plain with the distribution range migrating to the central basin gradually as the large scale base-level declines. The distributions of turbidites in the study area are controlled by four factors: The tectonic settings of the basin and peripheral areas control turbidite development from the macro level; the regional tectonic activities provide trigger mechanisms for turbidite development; the changes of base level cycle control the formation and distribution of turbidite; the ancient topography of prograding delta area determines the flow direction of turbidity currents in delta front and the depositional position. The turbidite deposit in Longdong area is of prime conditions for petroleum accumulation, being as an significant succeeding domain for incremental reserves and production in Changqing oil field in the future.