扶新隆起带东缘泉四段层序格架内的相分异研究  

Facies differentiation within the sequence stratigraphic framework of Q4formation in eastern Fuxin uplift zone

作　　者：罗超[1] 贾爱林[1] 罗水亮[2] 尹楠鑫[3] 张冠群 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]长江大学油气资源与探测技术教育部重点实验室,湖北武汉430100 [3]中国石化中原油田博士后工作站,河南濮阳457001 [4]中石化胜利油田油气集输总厂,山东东营257000

出　　处：《中国矿业大学学报》2016年第2期357-370,共14页Journal of China University of Mining & Technology

基　　金：国家科技重大专项(2011ZX05015)

摘　　要：松辽盆地扶新隆起带东缘泉四段沉积阶段,古地形平坦,气候由干旱向温湿转换,湖盆宽浅,发育大面积浅水三角洲沉积砂体.根据湖泛面、冲刷侵蚀面等层序界面特征,将扶新隆起带东缘泉四段划分为1个长期基准面上升半旋回、4个中期旋回,并细分为12个短期旋回.在精细等时地层格架建立的基础上,明确了泉四段沉积特征,并进一步分析了层序地层格架内随中、长期基准面升降变化的相分异作用.研究结果表明:受可容纳空间与沉积物供给比值(A/S)控制,在长期基准面旋回范围内,相分异作用使扶新隆起带东缘泉四段依次发育了高能和低能河控三角洲平原与三角洲前缘3种沉积亚相.泉四段河道砂体主要发育大幅切叠型、小幅切叠型、非下切拼接型和孤立型4种砂体接触关系.受相分异作用影响,中期基准面旋回的不同旋回位置呈现不同的砂体规模及叠置关系,上升阶段早期以发育大幅切叠型为主,中期多发育小幅切叠型、非下切拼接型,晚期砂体零星孤立分布.Under the arid paleoclimate condition,large-scale shallow delta deposited in Q4 formation of the eastern Fuxin uplift zone,southern Songliao Basin,where the paleotopography was flat.On the basis of sequence boundary characteristics like flooding surface and erosional surface,Q4 formation was divided into one long-term base-level uplifting semi cycle,four middle-term cycles,and subdivided into twelve short-term cycles.Within the delicacy stratigraphic framework,the sedimentary features of Q4 formation were identified.Then the facies differentiation affected by the change of base-level surface was analyzed in the sequence stratigraphic framework.The results demonstrate that high-energy delta plain,low-energy delta plain and delta front deposit in long-term base-level cycle by the affection of A/S ration,which is influ-enced by facies differentiation.There are four types of sand stacking models,respectively strong incision pattern,minor-scale incision pattern,non-incision pattern and isolate pattern.Affected by facies differentiation,different cycle position presents various sandbody scale and superimposed relationships in middle-term base-level cycle.Strong incision pattern arises in the early uplifting phase of base-level cycle,minor-scale incision pattern and non-incision pattern present in the middle of base-level cycle,and isolated one appears during the final of base-level cycle.

关 键 词：层序地层 相分异 泉四段 浅水三角洲 

分 类 号：TE122[石油与天然气工程—油气勘探]