| 湖泊水下扇沉积特征及影响因素--以伊通盆地莫里青断陷双阳组为例 |
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| 引用本文： | 刘招君.湖泊水下扇沉积特征及影响因素--以伊通盆地莫里青断陷双阳组为例[J].沉积学报,2003,21(1):148-154. |
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| 作者姓名： | 刘招君 |
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| 作者单位： | 吉林大学地球科学学院 长春130061 |
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| 摘 要： | 伊通盆地莫里青断陷始新统双阳组发育典型的湖泊水下扇体。根据岩心、测井和地震资料 ,并结合粒度分析等方法 ,将其划分为内扇、中扇和外扇亚相及某干微相。影响水下扇形成和分布的主要因素是 :同生断裂的活动造就了陡坡地形 ,其幕式活动成为水下扇形成的触发机制 ;阵发型水下扇主要发育在陡坡带 ,稳定型水下扇主要发育在扇三角洲的前端 ,气候因素也为稳定型水下扇形成创造了物源条件 ;基准面升降影响着水下扇的相序特征 ,低水位体系域和水退体系域易形成推进型水下扇 ,水进体系域易形成退缩型水下扇 ;半深湖 -深湖的滞水条件是水下扇得以保存的前提。统计结果表明本区获工业油气流的井主要集中在中扇 ,其中辫状水道微相最为富集。
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| 关 键 词： | 莫里青断陷 湖泊水下扇 识别标志 影响因素 |
| 文章编号： | 1000-0550(2003)01-0148-07 |
| 收稿时间： | 2002-12-26 |
| 修稿时间： | 2002年12月26日 |
Lacus Subaqueous Fan Sedimentary Characteristics and Influence Factors--A Case Study of Shuangyang Formation in Moliqing Fault Subsidence of Yitong Basin |
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| LIU Zhao-jun.Lacus Subaqueous Fan Sedimentary Characteristics and Influence Factors--A Case Study of Shuangyang Formation in Moliqing Fault Subsidence of Yitong Basin[J].Acta Sedimentologica Sinica,2003,21(1):148-154. |
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| Authors: | LIU Zhao-jun |
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| Institution: | College of Earth Science, Jilin University, Changchun 130061 |
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| Abstract: | It is typically developed lacus subaqueous fan of Shuangyang Formation in Moliqing fault subsidence of Yitong Basin in Eocene. According to core, well-logging and seismic data, associated with grading analysis and other methods, lacus subaqueous fan is divided into inner fan, middle fan and out fan. From bottom to top a integrated prograding lacus subaqueous fan is consisted of out fan, middle fan and inner fan subfacies in vertical , and it has the features that show thicker, coarser towards up. Inner fan can be further separated into channel, channel levee and slump deposits, middle fan is classified into braided channel, braided interchannel and suppafan lobes, and out fan is consisted of classic turbidites and lacustrine mudstone. Subaqueous fan is mainly formed at the side of steep slope controlled by contemporary fault, and some formed at the front of fan-delta. Primary factors which influence the distribution and emergence of subaqueous fan is that movements of contemporary fault bring steep landform, episode movements of which make up of the burst mechanics of subaqueous gravity flow forming. Subaqueous fan of steep slope mainly occurs at the zone of steep slope, stable subaqueous fan mostly emerges at the front of fan-delta, meanwhile climate is a favorable factor for stable subquous fan. Base-level affects the features of facies orders. It is easily formed prograding subaqueous fan in lowstand systems tracts and regressive systems tracts, there develop regressive subaqueous fan in the transgressive systems tracts as well. The precondition that preserves subaqueous fan is the backwater environment of deeper or deep lacus. The results of statistics show that all that bear industrial petroleum and gas mostly concentrated in the middle fan, and of which is much rich in the braided channel. |
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| Keywords: | Moliqing fault subsidence lacus subaqueous fan recognition mark influencing factors |
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