油气勘探

陆相断陷盆地基准面调控下的古地貌要素耦合控砂机制

  • 董桂玉 ,
  • 何幼斌
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  • 1. 华北理工大学矿业工程学院;
    2. 长江大学地球科学学院
董桂玉(1976-),男,河北保定人,博士,华北理工大学副教授,主要从事沉积学与含油气盆地分析研究。地址:河北省唐山市新华西道46号,华北理工大学矿业工程学院,邮政编码:063009。E-mail:dguiyuchengdu@sina.com

网络出版日期: 2016-11-02

基金资助

河北省自然科学基金(D2013209045)

Mechanism of sand body prediction in a continental rift basin by coupling paleogeomorphic elements under the control of base level

  • DONG Guiyu ,
  • HE Youbin
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  • 1. College of Mining Engineering, North China University of Science and Technology, Tangshan 063009, China;
    2. School of Geosciences, Yangtze University, Wuhan 430100, China

Online published: 2016-11-02

摘要

针对陆相断陷盆地砂体分布规律的复杂性,提出一种立足于整个“物源-搬运-沉积”过程的基准面调控下物源体系、沟谷体系、坡折体系3大古地貌要素耦合的砂体预测方法。该控砂机制以基准面为杠杆,以靠近湖盆边缘的平衡位置为支撑点,以古地貌要素为研究对象,强调动态因素调控静态因素,并充分考虑了流态转换和砂体成因。古地貌要素耦合方式理论上有8种,分别对应最差至最优的不同耦合沉积效应。在基准面升降过程中“跷跷板”效应的影响下,陆相断陷盆地中古地貌要素的耦合方式发生改变,导致砂体的成因、迁移方式和沉积环境等显著变化,进而控制砂体的分布规律。在该控砂机制指导下,分析了苏北盆地高邮凹陷和北部湾盆地涠西南凹陷的砂体发育规律,取得了良好的砂体预测效果,验证了控砂机制的有效性和实用性。图7表1参40

本文引用格式

董桂玉 , 何幼斌 . 陆相断陷盆地基准面调控下的古地貌要素耦合控砂机制[J]. 石油勘探与开发, 2016 , 43(4) : 529 -539 . DOI: 10.11698/PED.2016.04.04

Abstract

In view of the complex sandbody distribution in continental rift basins, a sandbody prediction method is proposed based on the coupling of three core paleogeomorphic elements, provenance system, channel system, and slope break system, which composes the process of “provenance-transport-sedimentation” controlled by base level. The sand body prediction method takes the base level as the lever, the equilibrium position near the lake basin edge as the supporting point, and the core paleogeomorphic elements as study objects, lays stress on the fact that dynamic factors controlling static factors, and takes full consideration of flow state conversion and sandbody genesis. The core paleogeomorphic elements have eight types of theoretical coupling modes, corresponding to coupling deposition effect from the worst to the optimal. During fluctuations of base level, the coupling modes of the core paleogeomorphic elements in continental rift basins change under the “seesaw effect”, as a result, the migration pattern, sedimentary environment, and genesis of sand body change significantly, which control sand body distribution in turn. The sand body development regularity of the Gaoyou Sag in Northern Jiangsu Basin and the Weixinan Sag in Beibu Gulf Basin has been analyzed based on this sand control mechanism and a good prediction result of sand body is achieved, which confirms the validity and practicality of the sand control mechanism.

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