摘要
塔里木盆地寒武-奥陶系发育的白云岩主要有4种成因,分别对应萨布哈、渗透回流、埋藏、热液等4种白云石化模式,根据岩石学和地球化学特征可以较好地识别出这4种白云岩。综合分析古地理、古气候等背景资料,总结了塔里木盆地不同成因白云岩在垂向及平面上的分布规律:萨布哈白云岩和渗透回流白云岩的发育受沉积相控制,主要发育于中下寒武统;埋藏白云岩的发育受成岩相控制,物性好的台缘、台内礁滩体及有裂缝沟通构成的开放体系最容易先发生埋藏白云石化作用;热液白云岩主要发育在具有上覆隔挡层的不整合面之下地层及大断裂发育带附近。
The dolomites of Cambro-Ordovician in Tarim basin are of four geneses,corresponding with four kinds of dolomitization ones such as sabakha dolomite,seepage reflux dolomite,buried dolomite and hydrothermal dolomite,which can be properly identified from the lithologic characteristics and geochemical characteristics.This paper comprehensively analyzes the paleogeographic and paleoclimate data,concludes the vertical and lateral distributions of dolomites with different geneses in Tarim basin： the development of sabakha dolomite and seepage reflux dolomite are controlled by sedimentary facies and mainly developed in Lower-Middle Cambrian;the development of burial dolomite are controlled by diagenetic facies,but the reef and shoal with high porosity as well as open system connected with fracture passage are easy to dolomitize;hydrothermal dolomite mainly develops below unconformity and near the discordogenic fault.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2011年第6期600-604,共5页
Xinjiang Petroleum Geology
基金
国家科技重大专项(2008ZX05004-002)
