梨树断陷苏家屯地区营城组沉积特征

doi:10.11743/ogg20130310

摘要/Abstract

摘要： 松辽盆地梨树断陷苏家屯地区营城组具有形成油气藏的良好条件,且研究程度低。为了研究其沉积微相与砂体储集条件,以指明有利储集相带,应用沉积学与高分辨率层序地层序理论方法,通过分析岩心、录井、测井、地震资料、古地貌特征,认为研究区主要发育湖泊相和辫状河三角洲相,并进一步识别出了分流河道、水下分流河道、水下分流间湾、河口坝、远砂坝、席状砂、泥坪、滩坝等8种沉积微相,并描述了主要沉积微相砂体特征。同时,将营城组划分为4段、6个四级层序和7个砂组,阐明了各砂组沉积相分布特征和时空演化规律。研究认为,营一段末期(SG2)湖侵至最大湖泛面,沉积于其上的SG3砂组进积体系是最有利的油气储集层。沉积微相平面展布与储层分析表明,该区存在两支主辫状水道,分流河道砂体叠置且储层物性好,其与后期鼻状构造相组合是构造-岩性圈闭与岩性圈闭发育的最有利区。

关键词: 沉积特征, 岩性圈闭, 营城组, 苏家屯地区, 梨树断陷, 松辽盆地

Abstract: The Yingcheng Formation in Sujiatun area,Lishu Rift in Songliao Basin,has good conditions for the formation of petroleum reservoirs.However,the level of research is low in this area.The paper is to identify favorable reservoir facies belt through study of sedimentary microfacies and sandstone reservoir conditions.The theories of sedimentoloy and high-resolution sequence stratigraphy were applied and the cores,mud logging,well logging,seismic data and palaeogeomorphology data were integrated.The study revealed that lacustrine and braided river delta sedimentary facies are predominant in the study area.Furthermore,eight sedimentary microfacies were identified,including distributary channel,underwater distributary channel,underwater interdistributary,month bar,distal bar,sheet-like sand,mudflats and bank bars.And the main characteristics of sandstones of sedimentary microfacies are described.The Yingcheng Formation was divided into 4 Members,6 fourth-order sequences and 7 sand groups.The sedimentary facies distribution and their temporal and spatial evolution of each sand group(SG) were discussed.The transgressive surface to maximum lake flooding surface occurred at the end of deposition of the Ying-1 Member (SG2),and the overlying SG3 is the most favorable reservoir.Analyses of plain distribution of sedimentary facies and reservoir reveal two main braided channels with good stacked distributary channel sand bodies and reservoir properties.The main braided channels in combination with late nose structure are the most favorable areas for the development of structural-lithologic traps and lithology traps.

Key words: sedimentary characteristics, lithologic trap, Yingcheng Formation, Sujiatun area, Lishu Rift, Songliao Basin

中图分类号:

TE121.3

杨特波,王宏语,樊太亮,等. 梨树断陷苏家屯地区营城组沉积特征[J]. 石油与天然气地质, 2013, 34(3): 349-356. doi: 10.11743/ogg20130310 Yang Tebo,Wang Hongyu,Fan Tailiang,et al. Sedimentary characteristics of Yingcheng Formation in Sujiatun area, Lishu Rift in Songliao Basin[J]. Oil & Gas Geology, 2013, 34(3): 349-356. doi: 10.11743/ogg20130310

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