天然气地球科学 ›› 2010, Vol. 21 ›› Issue (5): 786–792.doi: 10.11764/j.issn.1672-1926.2010.05.786

• 天然气地质学 • 上一篇    下一篇

二连盆地乌里雅斯太凹陷下白垩统湖底扇沉积特征及成因分析

邓毅林, 王天琦, 曹正林, 裴明利, 赵伟, 杨桂茹   

  1. 1.中国石油勘探开发研究院西北分院,甘肃 兰州  730020;
    2.中国石油华北油田分公司,河北  任丘  065520
  • 收稿日期:2009-09-15 修回日期:2010-01-22 出版日期:2010-10-10 发布日期:2010-10-10
  • 通讯作者: 邓毅林dengyl@petrochina.com.cn. E-mail:dengyl@petrochina.com.cn.
  • 作者简介:邓毅林(1979-),男,湖北蕲春人,工程师,主要从事沉积、储层方面的研究.
  • 基金资助:

    国家重点基础研究发展计划(“973”)项目(编号:2007CB209604)资助.

Depositional Characteristics and Genesis of Lower  Cretaceous Sublacustrine Fan in Wuliyast Sag, Erlian Basin

DENG Yi-Lin, WANG Tian-Qi, CAO Zheng-Lin, FEI Meng-Li, DIAO Wei, YANG Gui-Ru   

  1. 1.Northwest Branch, Research Institute of Petroleum Exploration and Development, PetroChina, Lanzhou 730020, China; 2. Huabei Oil Field Company,PetroChina, Renqiu 065520,China.
  • Received:2009-09-15 Revised:2010-01-22 Online:2010-10-10 Published:2010-10-10

摘要:

二连盆地乌里雅斯太凹陷下白垩统发育一套典型的湖底扇沉积,其由补给水道、内扇、中扇和外扇4个部分组成,主要发育有补给水道,内扇主沟道和沟堤,中扇辫状沟道、沟道间和外扇席状浊积砂等微相类型。湖底扇单个扇体规模不大,但往往多期次发育、成群分布,垂向上相互叠置、横向上叠加连片,规模可观。足够的可容纳空间和持续的物源补给是形成厚层湖底扇的2个重要条件,同沉积断裂的下降盘和坡折带是湖底扇发育的有利部位。湖底扇砂砾岩体具有毗临生油洼槽、易于形成岩性圈闭、易于油气聚集等优越条件,对岩性油气勘探具有重要意义。

关键词: 湖底扇, 岩性圈闭, 沉积特征, 坡折带, 乌里雅斯太凹陷, 二连盆地

Abstract:

A set of typical sedimentation of sublacustrine fans in lower Cretaceous in Wuliyasitai sag of Erlian basin is composed of feeder channel, inner fan, middle fan, and outer fan. The main micro-facies include feeder channel and main channel in inner fan, furrow dam and braided channel in middle fan, inter-channel and sheet turbidite sand in outer fan. Although a single sub-lacustrine fan is not large in scale, the sedimentation is characterized as multi-stage development, group distribution, vertical superposition, and superimposed horizontal lace. Thus, the depositional scale is large. The big open ended space and continuous supply of deposits are two key factors for f-ming the thick sub-lacustrine fan. Meanwhile, the place of downthrown block of growth fault or the slope-break zones is the favorable area for the sub-lacustrine fan development. The conglomerate body in sub-lacustrine fan is close to hydrocarbon-generated sag and prone to lithologic trap formation and hydrocarbon accumulation; thus it is important for oil and gas exploration.

Key words: Sub-lacustrine fan, Lithologic trap, Depositional fearure, Slope-break zones, Wuliyasitai sag, Erlian basin.

中图分类号: 

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