收稿日期: 2013-04-07
修回日期: 2013-08-07
网络出版日期: 2014-05-10
基金资助
国家重大油气科技专项课题(编号:2011ZX05015);中国石油科技项目(编号:2011B-15)联合资助.
Early Cretaceous Sedimentary Systems and Depositional Process during the Period of Transition from Faulted Depression to Sag,Changling Faulted Depression,Songliao Basin
Received date: 2013-04-07
Revised date: 2013-08-07
Online published: 2014-05-10
松辽盆地南部长岭断陷下白垩统致密砂岩天然气勘探开发不断有新的发现，显示出较大的勘探开发潜力。研究下白垩统登娄库组与泉一段物源、沉积相、沉积体系展布规律对天然气富集区带评价及开发具有重要的意义。利用重矿物、砂岩碎屑成分及地震剖面等资料确定长岭断陷登娄库组和泉头组一段沉积时期主物源方向为西南及南部，以发育辫状河及辫状河三角洲相为主，同时，还发育冲积扇、扇三角洲和湖泊相。登娄库组沉积早期，发育多个被低凸起分隔的次断凹，在断凹陡坡带发育扇三角洲，缓坡带发育辫状河—辫状河三角洲沉积体系，沉积体系分散于各断凹内，且互不影响；登娄库组沉积后期，长岭断陷性质由断陷向坳陷转换，断凹相互连通，沉积中心趋于一致，来自多个物源的辫状河—辫状河三角洲沉积体系，向沉积中心推进。泉一段沉积时期，长岭断陷整体沉降，沉积中心北移，至此完成了由断陷向坳陷的转化，辫状河在宽缓的地形上广泛发育，河道砂体具有广覆式大面积分布的特征。前期勘探揭示，辫状河道相互叠置形成的厚砂层，是主要的储集体类型，结合沉积体系展布特征，评价优选出2个主要有利区带:①登娄库组上部辫状河与辫状河三角洲平原相带，主体分布于长岭断陷南部哈尔金—西西里嘎与双坨子—老爷府低凸起带；②泉一段底部辫状河道叠置带，在长岭断陷南部广泛分布。
李易隆,贾爱林,何东博,李艳,韩品龙,吴朝东 . 松辽盆地长岭断陷早白垩世断坳转换期沉积体系特征与演化过程[J]. 天然气地球科学, 2014 , 25(5) : 709 -720 . DOI: 10.11764/j.issn.1672-1926.2014.05.709
Recently,tight sand gas plays have been discovered in the Lower Cretaceous of Changling fault depression,southern Songliao Basin.By analyzing abundant materials,it is concluded that the dominant provenance is in the south and southwest of the depression.During the transition from a fault depression to a sag,the dominant sedimentary facies are braided river and braided river delta,with other facies such as alluvial fan,fan delta and lacustrine.In the early stage of the deposition progress,several separated depressions form.Faulted steep slope controls the distribution of fan deltas and also the distribution of depocenters.Gentle slope controls the distribution of braided rivers and braided river deltas.During the late stage of depositional progress,only one depocenter remains in the north.The abundant sediments from southern provenance prograde to the north.During the deposition of Quan I member,the only depocenter immigrates to the north.Braided rivers fill the main area of Changling Sag,and the river channels stacked in a large area.Based on the analyses of sedimentary systems,we predicted two potential reservoir belts: one is the braided river sand belts of Denglouku Formation on the south low uplift,the other one is braided river sand belts of lower Quan I member in the southern Changling sag.
Key words： Tight gas sands; Depositional process; Braided river; Braided river delta
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