天然气地质学

三级层序内受底流影响的富砂深水沉积演化规律——以东非鲁武马盆地中中新统为例

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  • 中国石油杭州地质研究院,浙江 杭州 310023
孙辉(1969-),女,吉林磐石人,高级工程师,主要从事地震深水沉积及储层研究. E-mail:sunh_hz@petrochina.com.cn.

收稿日期: 2016-05-03

  修回日期: 2016-09-11

  网络出版日期: 2017-01-10

基金资助

中国石油天然气集团公司科学研究与技术开发项目(编号:2016D-4303)资助.

Evolution of deepwater sand-rich sediments affected by bottom currents in the 3rd order sequences:A case study of Middle Miocene in the Ruvuma Basin

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  • Hangzhou Research Institute of Geology,PetroChina,Hangzhou 310023,China

Received date: 2016-05-03

  Revised date: 2016-09-11

  Online published: 2017-01-10

摘要

鲁武马盆地深水沉积是深水重力流和底流综合作用的结果,局部水道和天然堤的迁移方向与底流运动方向相反,不同级别层序内的粗粒沉积物分布呈现出规律性。以高分辨率三维地震资料和测井资料为基础,在中中新统三级层序内识别出5种具有不同的岩性组成和规模的深水沉积结构单元,包括局限性水道复合体、朵体、决口扇、天然堤_溢岸沉积以及滑塌沉积。利用先进的地球物理成像技术和分析方法,建立了深水沉积复合体演化模式。研究表明,底流对重力流沉积的影响作用主要表现在天然堤的沉积位置和方式、水道的迁移方向、朵体的分布位置和展布等;不同级别的海平面变化旋回及不同的沉积位置,底流对重力流沉积产生不同的影响;有利储层主要分布在水道内及与底流运动方向相反的水道侧翼。

本文引用格式

孙辉,吕福亮,范国章,刘少治,鲁银涛,陈宇航 . 三级层序内受底流影响的富砂深水沉积演化规律——以东非鲁武马盆地中中新统为例[J]. 天然气地球科学, 2017 , 28(1) : 106 -115 . DOI: 10.11764/j.issn.1672-1926.2016.11.024

Abstract

Deepwater sedimentary constructions in Ruvuma Basin are carried out by the combined action of gravitational processes and processes related to bottom currents.Local channels display obviously migrating characteristic,migrating direction correspond to the opposite direction of bottom current.This analysis reveals that coarse sediments in different order sequences show systematic distribution.High resolution 3D seismic data and well logging data were used for the identification of 5 deep-water sedimentary architecture elements,including the limited channel complexes,lobes,crevasse splays,levee-overbanks and slumps in third-order sequences,corresponding to the Middle Miocene.These sedimentary architecture elements own different lithologic compositions and scales.The evolution model of deep-water sedimentary complex was established by means of advanced geophysical imaging techniques and analysis methods.Results show that the interactions between deep-water bottom currents and gravity flows are reflected in the levees location and mode,migration direction of channels,position and distribution of lobes.The bottom currents have different effects on gravity flow deposits in different sea-level change cycles and different depositional position.The favorable reservoir is mainly distributed in the channels and the flank which are contrary to the direction of bottom currents movement.

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