重力驱动作用--滦平盆地下白垩统西瓜园组沉积时期主要的搬运机制  

Gravity-Driven Processes:a More Important Transport Mechanism of Deposits in Xiguayuan Formation of Lower Cretaceous in Luanping Basin, Northern Hebei

作　　者：耳闯[1] 顾家裕[1] 牛嘉玉[1] 程妮[2] 韩少飞[3] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]延长石油有限公司靖边采油厂,陕西靖边718500 [3]长庆油田分公司第一采气厂,陕西靖边718500

出　　处：《地质论评》2010年第3期312-320,共9页Geological Review

基　　金：中国石油天然气股份公司科技项目“渤海湾盆地精细勘探与滩海大油气田分布规律研究”(项目编号2009B-0300)

摘　　要：通过对冀北滦平盆地下白垩统西瓜园组沉积地层的实地考察,发现盆地内发育丰富的重力驱动作用沉积物。文中描述西瓜园组发育的滑动和滑塌现象,指出露头剖面中存在的挤压变形现象并非构造成因,而是由于滑动块体和滑塌块体前端的挤压应力环境造成的。在介绍西瓜园组重力流沉积发育环境的基础上,对露头中存在的若干重力流沉积进行了描述,并使用砂质碎屑流这一概念对这些现象进行了较为合理的成因解释。通过对滑动和滑塌(重力块体运动)和砂质碎屑流—浊流(重力流)沉积物研究,结合前人对该地区冲积扇—扇三角洲的研究成果,认为重力驱动作用是滦平盆地下白垩统西瓜园组沉积时期主要的搬运机制。Based on the observation in field, it is indicated that deposits of gravity-driven process are well developed in the Xiguayuan Formation of Low Cretaceous in the Luanping Basin, Northern Hebei. The slide and slump deposits in the Xiguayuan Formation are described. It is indicated that some compression deformations in the outcrop are formed by sedimentary process rather than tectonic origin. After introducing the sedimentary environment of the gravity flow deposit in the Xiguayuan Formation, some gravity flow deposit in the outcrop are delineated and they can be reasonably interpreted by sandy debris flow. Based on the study on slide and slump （mass movement） and the deposits of sandy debris flow—turbidity current, integrated the results of the former study on fluvial fan—fan delta, gravity-driven process is considered to be the more important transport mechanism.

关 键 词：滦平盆地 下白垩统 重力驱动作用 滑动 滑塌 砂质碎屑流 搬运机制 河北省 

分 类 号：P512.2[天文地球—地质学]