北部湾盆地涠西南凹陷碳酸盐岩潜山表生岩溶储层特征与演化模式
投稿时间:2021-12-01  修订日期:2022-02-21  点此下载全文
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王永辉 中国石油大学(北京)地球科学学院 102249
张友浩 中国石油大学(北京)地球科学学院 
高先志 中国石油大学(北京)地球科学学院 
宋言 中国石油大学(北京)地球科学学院 
王红梅 中国石油大学(北京)地球科学学院 
曲付涛 中国石油大学(北京)地球科学学院 
中文摘要:潜山储层是潜山油气成藏的重要条件,潜山领域是涠西南凹陷今后的重要勘探领域。本文综合运用岩心观察、薄片鉴定、碳-氧同位素测定、包裹体测温、钻录井及测井资料对涠西南凹陷碳酸盐岩潜山储层开展研究。研究表明,涠西南碳酸盐岩潜山储层主要为岩溶储层,并且发育同生-准同生期岩溶、埋藏岩溶和表生岩溶三种不同环境的岩溶作用,其中以表生岩溶作用为主;表生岩溶储层自上而下划分为表层岩溶带、垂直渗流带和水平潜流带;各个岩溶带在横向上具有可对比性。工区碳酸盐岩岩溶发育程度受沉积相、古地貌及后期构造运动控制:潮坪沉积环境下的白云岩的岩溶储层更发育;岩溶斜坡区岩溶较发育;新生代断裂构造作用调整了原始岩溶储层带的分布深度,导致现今不同潜山间的岩溶储层带分布深度有差异。
中文关键词:涠西南凹陷  潜山  碳酸盐岩储层  表生岩溶  演化模式  石炭系
 
Characteristics and Evolvement Model of Epigenetic Karst Reservoirs in Carbonate Buried-hill in Weixi’nan Sag, Beibuwan Basin
Abstract:Buried hill reservoirs are important conditions for buried hill hydrocarbon accumulations. The buried hill area is also one of important subsequent exploration areas in Weixi’nan Sag. This paper comprehensively uses core observation, thin section identification, carbon-oxygen isotope measurement, inclusion temperature measurement as well as drilling and logging data to conduct research on carbonate buried hill reservoirs in Weixi’nan Sag. It shows that the carbonate buried hill reservoirs in Weixi’nan are mainly karst reservoirs. There are three types of karstifications, including depositional - interregional karst, buried karst and epikarst, among which the epikarst is most common karstification in the work area. The epikarst reservoirs zones are vertically divided into subsurface zone, vadose zone and lenticular phreatic zone. Each epikarst reservoirs zone can be compared horizontally. The controlling factors of carbonate karst reservoirs in the work area mainly contain sedimentary facies, paleo-geomorphic and late tectonic movements. It proposes that dolomites in the tidal-flat zone are more favorable lithology for reservoirs development. The karst slopes are favorable paleo-geomorphic in the area. Cenozoic faults have adjusted the original distribution depths of karst reservoirs zones, which has led to different distribution depths of karst reservoirs zones among different buried hills today.
keywords:Weixi’nan Sag  buried hill  carbonate reservoirs  epikarst  evolvement model  Carboniferous
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