Characteristics and petroleum geological significance of lacustrine forced regressive deposits in the 1<sup>st</sup>Member of Liushagang Formation in Weixi'nan Sag, Beibuwan Basin

Pei Jianxiang; Dong Guineng; Zhu Qi

doi:10.11743/ogg20160408

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Characteristics and petroleum geological significance of lacustrine forced regressive deposits in the 1^stMember of Liushagang Formation in Weixi'nan Sag, Beibuwan Basin
Vol. 37, Issue 4, Pages: 520-527(2016)
Online First：08 August 2016，

Published：2016
DOI： 10.11743/ogg20160408
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DOI：

Pei Jianxiang, Dong Guineng, Zhu Qi. Characteristics and petroleum geological significance of lacustrine forced regressive deposits in the 1^stMember of Liushagang Formation in Weixi'nan Sag, Beibuwan Basin[J]. 2016, 37(4): 520-527. DOI: 10.11743/ogg20160408. DOI：

摘要

北部湾盆地涠西南凹陷始新统流沙港组一段发育一套斜交前积结构地层。利用地质、测井和地震等资料，通过单井相、连井对比和地震相特征等沉积相的综合研究，证实这套地层为强制湖退沉积体。该强制湖退沉积体在单井相上具有自下而上沉积水体明显变浅的特征，在连井对比中表现为多期三角洲纵向叠置横向有序迁移，而地震反射同相轴则表现出明显的斜交前积特征。进一步的研究表明，沉积基底局部构造抬升是流一段发生强制湖退的主控因素。这套强制湖退沉积体的发现不仅解决了涠西南凹陷涠三段和流一段区域地层划分与对比存在的分歧，同时在强制湖退沉积体系域内找到了浊积体、湖底扇和进积三角洲等多类型岩性圈闭，并发现了油气藏，拓展了凹陷找油新领域。

Abstract

An oblique progradational sequence occurs in the 1

Member of Liushagang Formation in Weixi'nan Sag

Beibuwan Basin.A comprehensive analysis of single well facies

multi-well correlation

and seismic facies based on geological

logging and seismic data reveals that it belongs to lacustrine forced regressive deposits.It is characterized by obvious upward shallowing in respect of singe well facies

vertical overlapping and lateral sequential migration of multi-phase deltas in multi-well correlation

and significant oblique progradation reflection configuration on seismic profiles.Local uplifting of the basement is the main controlling factor for the development of lacustrine forced regression.The identification of the lacustrine forced regressive deposits helped to eliminate the disputes concerning stratigraphic division and correlation of the 3

Member of Weizhou Formation and the 1

Member of Liushagang Formation in Weixi'nan sag.Meanwhile

it also led to the recognition of lithologic traps such as turbidite

sublacustrine fan

and progradational delta and the discovery of several reservoirs within the lacustrine forced regression system tracts

thus expanding new domains for oil and gas exploration in this sag.