河北滦平断陷盆地早白垩世陡坡进积型扇三角洲沉积特征

现代地质 ›› 2005, Vol. 19 ›› Issue (Suppl): 54-58.

河北滦平断陷盆地早白垩世陡坡进积型扇三角洲沉积特征

张玄杰^1,2，罗平²，张兴阳²，顾家裕² ，房小荣²

1成都理工大学能源学院，四川成都610059；2中国石油勘探开发科学研究院，北京100083

收稿日期:2004-07-15 修回日期:2004-09-10 出版日期:2005-03-20 发布日期:2013-04-08
作者简介:张玄杰，男，硕士研究生，1979年出生，矿产普查与勘探专业，主要从事沉积地质的研究工作。

SEDIMENTARY CHARACTERISTICS OF STEEP-SLOPE PROGRADING FAN DELTA IN THE LUANPING FAULTED BASIN

ZHANG Xuan-jie^1,2 ，LUO Ping²，ZHANG Xing-yang²，GU Jia-yu²，FANG Xiao-rong²

1Chengdu University of Technology，Chengdu，Sichuan610059,China;
2Research Institute of Petroleum Exploration and Development，PetroChina，Beijing100083 China

Received:2004-07-15 Revised:2004-09-10 Online:2005-03-20 Published:2013-04-08

摘要/Abstract

摘要：

早白垩世滦平断陷湖盆发育冲积扇—扇三角洲－湖泊沉积体系，盆地演化的不同时期及不同部位发育不同类型的扇三角洲。陡坡进积型扇三角洲发育于断陷盆地的陡坡一侧，其中扇三角洲前缘是其沉积主体，发育席状砂、河口坝、前缘水道、前缘水道间漫流沉积等微相类型，各微相中以河口坝沉积及水道间漫流沉积微相最为典型。河口坝沉积及前缘水道间漫流沉积均受前缘水道内强度周期性变化的洪流的影响，前者为前缘水道外侧由出水道口的高流态片状流（牵引流或颗粒流）与湖浪相互作用的产物，储集性较好；后者为洪水期溢出前缘水道两侧的悬浮负载的沉积产物，储集性差。结合区域沉积层序发育特征，认为陡坡进积型扇三角洲为断陷湖盆收缩晚期冲积扇进积到断阶带形成的一类扇三角洲，并建立了该类扇三角洲的沉积模式。

关键词: 扇三角洲, 河口坝, 漫流沉积, 断陷盆地, 滦平断陷盆地

Abstract:

In Lower Cretaceous Luanping faulted basin is characterized as an alluvial fan—fan delta—lake depositional system. Different types of fan deltas develope under different tectonic settings during evey period of the basin evolution have been found in the outcrops.The fan delta is developed along the steep-slope belt of the faulted basin. The fan delta front is composed of front sheet sand,mouth bar，front channel and overbank sheet-flow deposits. The mouth bar and overbank sheet-flow microfacies are typical in the fan delta front, which are both controlled by periodically developed floods in the channels.Produced by the joint effects of sheet-flow (traction current or grain flow) out of channel mouth with high flow energy and lake waves or currents, the mouth bar is of relatively good reservoir quality.With poor reservoir quality, the overbank sheet-flow unit is deposited by the suspension-load flow over the distal-front channel's bank. Considering the regional distribution features of sedimentary sequence and deposition system, we propose that this type of fan delta progresses to the secondary fault zone along the steep-slope belt during the later period of fault basin uplifting. A depositional model of this kind fan delta has been established.

Key words: fan delta, mouth bar, sheet flow, fault basin, the Luanping faulted basin

中图分类号:

TE122

张玄杰，罗平，张兴阳，顾家裕，房小荣. 河北滦平断陷盆地早白垩世陡坡进积型扇三角洲沉积特征[J]. 现代地质, 2005, 19(Suppl): 54-58.

ZHANG Xuan-jie，LUO Ping，ZHANG Xing-yang，GU Jia-yu，FANG Xiao-rong. SEDIMENTARY CHARACTERISTICS OF STEEP-SLOPE PROGRADING FAN DELTA IN THE LUANPING FAULTED BASIN[J]. Geoscience, 2005, 19(Suppl): 54-58.

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