北部湾盆地乌石凹陷流二段孢粉相与三角洲～湖底扇沉积体系  

Palynofacies and Sedimentary Systems of the Delta and the Sublacustrine Fan in the 2nd Member of Liushagang Formation of Wushi Sag,Beibuwan Basin

作　　者：钟泽红 刘娟 徐万兴 何卫军 胡林 罗威 任拥军[2] ZHONG Ze-hong LIU Juan XU Wan-xing HE Wei-jun HU Lin LUO Wei REN Yong-jun(Zhanjiang Branch of CNOOC Ltd. 1 , Zhanjiang 524057 , P. R. China China University of Petroleum2 , Dongying 257062,P. R. China)

机构地区：[1]中海石油(中国)有限公司湛江分公司,湛江524057 [2]中国石油大学,东营257062

出　　处：《科学技术与工程》2017年第3期7-15,共9页Science Technology and Engineering

摘　　要：近年在北部湾盆地乌石凹陷东区流二段中部获得了重要的原油勘探发现。为明确该储层的沉积成因及层序归属,采用孢粉相、岩心相等分析方法开展层序及沉积相研究。其中,典型井微体古生物中陆源物质及湖相生物组分的垂向演化直观反映出流二段可分为下、中-1、中-2及上层序;且它们的沉积环境发生过明显变化,在中层序该区发生明显湖退、促进大型储集体的形成。通过岩/壁心观察、粒度特征、岩电响应、地震相与沉积相分析,确立乌石凹陷流二段中层序沉积相平面分布。结合岩石类型、含砂率、砂岩总厚度、最大单层砂岩厚度统计,以及断裂分布研究,重点解剖了乌石凹陷东区流二段三角洲~湖底扇体系的沉积与展布特征。There are important discoveries of oil exploration in the 2nd member of Liushagang Formation east of Wushi Sag,Beibuwan Basin in recent years. To identify the origin of the reservoir and which sequence it belongs to,the sequences and the sedimentary facies were carried out by the method of palynofacies and core analysis etc.Among them,the vertical change of continental and lacustrine microscopic biological components in a typical well data indicate a division from lower to middle 1- 2 to upper sequence of the 2nd member of Liushagang Formation,which have obvious environmental changes. There is an obvious lake retreat in middle sequence of the 2nd member of Liushagang Formation and it causes a large reservoir. By core or sidewall core observation and analysis of granularity characteristics and rock-electrical response and seismic and sedimentary facies,the distribution of the sedimentary systems in middle sequence was identified in the 2nd member of Liushagang Formation of Wushi Sag. With the statistics of rock types and sand ratio and total thickness of sandstones and the biggest single sandstone thickness,and with the fault distribution,on the sedimentary characteristics and distributions of the delta and the sublacustrine fan were focud in the 2nd member of Liushagang formation east of Wushi Sag,Beibuwan Basin.

关 键 词：乌石凹陷 流二段 孢粉相 三角洲 湖底扇 断裂坡折 

分 类 号：P315.2[天文地球—地震学]