松辽盆地梨树断陷层序地层格架及沉积体系分布

J4 ›› 2014, Vol. 20 ›› Issue (1): 122-.

松辽盆地梨树断陷层序地层格架及沉积体系分布

陈贤良,纪友亮,樊太亮,王宏语,闫宁,陈晓艳

出版日期:2014-03-20 发布日期:2014-04-19

Sequence Stratigraphic Framework and Sedimentary System Distribution in the Lishu Rift, Songliao Basin

CHEN Xianliang,JI Youliang,FAN Tailiang,WANG Hongyu,YAN Ning,CHEN Xiaoyan

Online:2014-03-20 Published:2014-04-19

摘要/Abstract

摘要： 在层序地层学原理和方法的指导下,综合利用地震、测井、钻井及岩心等资料,结合盆地构造演化特征,建立了梨树断陷断陷层(晚侏罗世火石岭组及早侏罗世沙河子组、营城组和登娄库组)层序地层格架。将梨树断陷断陷层划分为 1 个一级层序(TSq1)、3 个二级层序 (I—III)、7 个三级层序 (SQ1—SQ7),并在层序格架内进行沉积相划分和沉积体系研究, 明确研究区主要发育冲积扇、扇三角洲、辫状河三角洲、近岸水下扇和湖泊等沉积体系。冲积扇沉积体系主要分布在早期 SQ2 层序中;扇三角洲沉积体系主要分布在 SQ3 和 SQ4 层序中;SQ5,SQ6 和 SQ7 层序则以辫状河三角洲沉积为主;近岸水下扇沉积体系主要发育在 SQ4、SQ5 和 SQ6 各层序的陡坡带。沉积体系在平面与纵向上的演化受古构造与古地貌的双重控制, 提出梨树断陷 SQ4 和 SQ5 层序沉积砂体为较有利的勘探区域。

关键词: 梨树断陷;断陷层;层序地层;沉积体系;松辽盆地

Abstract: Based on seismic data, logging, drilling data, cores and characteristic of structure evolution, sequence framework of faulted layer in the Lishu rift is established. The faulted layer of the Lishu rift includes the Late Jurassic-Early Cretaceous strata of Huoshiling, Yingcheng, Shahezi and Denglouku formations, and is subdivided into three second-order sequences (I-III) and seven third-order sequences (SQ1-SQ7). Furthermore, sedimentary facies and sedimentary system are studied within the sequence frameworks. The results show that it mainly developed alluvial fan, fan delta, braided river delta, nearshore subaqueous fan, and lacustrine sedimentary system. Alluvial fan system mainly developed in the SQ2 sequence. Fan delta system mainly developed in the SQ3 and SQ4 sequences. Braided river delta system was found in the SQ5, SQ6 and SQ7 sequences. Nearshore subaqueous fan system mainly developed in the steep-slope zone of the SQ4, SQ5 and SQ6 sequences. The lateral and vertical evolutions of sedimentary systems were controlled by palaeostructure and palaeogeomorphology. The sand bodies of the SQ4 and SQ5 sequences are more favorable exploration area in the Lishu rift.

Key words: Lishu rift;faulted layer;sequence stratigraphy;sedimentary system;Songliao Basin

陈贤良,纪友亮,樊太亮,王宏语,闫宁,陈晓艳. 松辽盆地梨树断陷层序地层格架及沉积体系分布[J]. J4, 2014, 20(1): 122-.

CHEN Xianliang,JI Youliang,FAN Tailiang,WANG Hongyu,YAN Ning,CHEN Xiaoyan. Sequence Stratigraphic Framework and Sedimentary System Distribution in the Lishu Rift, Songliao Basin[J]. J4, 2014, 20(1): 122-.