沉积环境对鹤岗煤田煤岩储集空间的影响  

Influences of depositional environment on reservoir space of coal in Hegang Coalfield

作　　者：苗明[1] 

机构地区：[1]中国石油化工集团公司胜利油田分公司勘探开发研究院,山东东营257015

出　　处：《煤炭科学技术》2016年第11期160-166,177,共8页Coal Science and Technology

基　　金：中国石油天然气股份有限公司重大科技专项资助项目(2010E-2201;2012E-2603)

摘　　要：为探明沉积环境对煤岩储集空间的控制作用,应用扫描电镜、低温氮吸附和聚类分析等多种分析测试手段,对鹤岗煤田城子河组煤岩孔隙、裂隙和成煤环境进行系统研究。结果表明:鹤岗煤田孔隙结构存在4种孔隙模型,从模型I到模型IV,孔隙形态和裂隙类型逐渐多样化。孔隙的吸附能力增强,但解吸难度加大;煤相分析显示鹤岗煤田主要聚煤期由南向北富水程度加深,埋藏速度增大。扇三角洲为主要聚煤环境,北部煤层厚度和稳定性优于南部;沉积环境对煤层孔隙结构和裂隙发育具有一定的控制作用。由北向南,灰分含量增加,孔隙系统逐渐复杂,裂隙数量和类型逐渐多元化。研究认为鹤岗煤田储集空间具有南繁北简的特征,渗流能力存在南强北弱的特点。In order to discover the effect of depositional environment on reservoir space of coal,pore and fracture characteristics and formation environment of coal in Chengzihe Formation of Hegang Coalfield were systematically analyzed using a series of analytical methods including scanning electron microscope,low temperature nitrogen adsorption and cluster analysis.The results showed that there were four types of pore models in Hegang Coalfield.From Model I to Model IV,the pore morphology and types of fissure gradually became diversi- fied.Meanwhile,with the increase of pore adsorption capacity, desorption became more difficuh. Coal facies analysis revealed that from south to north the overlying water deepened and the speed of burial accelerated daring main coal-forming period of Hegang Coalfield. Fan -delta was the main coal accumulating environment and the thickness and stability of coal seam in the north were superior to the south. The depositional environment had a certain influence on pore structure and fracture development.From north to south, increasing ash con- tent and more complicated pore system were observed and the number and types of fracture gradually diversified .It is concluded that the reservoir space of the south is more complex than the north and the porosity and permeability of the south are larger than the north.

关 键 词：鹤岗煤田 孔隙模型 储集空间 煤相 沉积环境 

分 类 号：TE122[石油与天然气工程—油气勘探]