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

发布时间：2018-06-10 06:30

本文选题：乌石凹陷 + 流二段　；参考：《科学技术与工程》2017年03期

【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。
[Abstract]:In recent years, important oil exploration discoveries have been obtained in the middle of the eastern part of Wushi Sag, Beibu Bay Basin. In order to determine the sedimentary origin and sequence attribution of the reservoir, the study of sequence and sedimentary facies is carried out by using the method of sporopollen facies and core equality analysis. Among them, the vertical evolution of terrestrial matter and lacustrine biological components in the microfauna of typical wells directly reflects that the second member of the stream can be divided into two parts: middle -1, middle -2 and upper order, and their sedimentary environment has changed obviously. Obvious lake retreat occurred in the middle sequence area, which promoted the formation of large reservoir. Through the observation of rock / wall core, grain size characteristics, rock electrical response, seismic facies and sedimentary facies analysis, the plane distribution of sequence sedimentary facies in the second stage of flow in Wushi sag is established. Based on the study of rock type, sand content, total thickness of sandstone, maximum single layer sandstone thickness, and fault distribution, the sedimentary and distribution characteristics of deltaic to sublacustrine fan system in the eastern part of Wushi sag are mainly dissected.
【作者单位】：中海石油(中国)有限公司湛江分公司;中国石油大学;
【分类号】：P618.13

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