塔东英东区块寒武系白云岩储层岩石类型及其白云化作用机制

The Rck Tpe of the Dolomite Rservoir and the Dolomization Mechanism of the Cambrian in the Estern Bock of the Tadong Yingdong Bock

本文通过对岩屑、岩芯进行观察,通过薄片鉴定、阴极发光分析和测井资料处理分析等技术手段,在YD1、YD2、LX1和ML1等探井的钻井资料、岩芯资料、录井资料、薄片资料和测井资料的基础上,对英东区块寒武系白云岩储层岩石类型及其白云化作用机制进行研究。英东区块寒武系白云岩主要为晶粒结构,其矿物主要是白云石,可分为粉-微晶白云石、粉-中晶它形脏白云石、粉-中晶半自形白云石、中-粗晶脏白云石、中-粗晶较干净白云石和鞍状白云石。英东区块寒武系白云石的成因机制主要有蒸发泵、渗透回流、浅埋藏、深埋藏和热液白云化作用机制,同时同类白云石往往是多种成因机制叠加的产物。

Base on the drilling, drill core, geological logging, thin sectionand well logging data of Yingdong 1 well, Yingdong 2 well,Luoxi 1 well and Milan 1 well , the reservoir rock types and mechanism of dolomitization of the Cambrian dolomite reservoir arestudiedthrough core observation, thin sectionanalysis , cathodoluminescence analysisand well logging data analysis. Based on core and thin section observation, point out that the types of dolomite of the Cambrian in study area include ： powder - sized to micro crystalline dolomite; powder - sized to medium crystalline xenomorphic dirty dolomite; powder - sized to medium idiomorphic crystalline dolomite; medium- coarse crystalline dirty dolomite; medium- coarse crystalline clean dolomite and Saddle dolomite; base on geochemical analysis, point out that formation Mechanism of the dolomite include evaporative pumping, reflux dolomitization, shallow burial dolomitization and hydrothermal dolomitization, and the same type of dolomite experienced the stacking of four dolomitization models.