莺歌海盆地东方区黄流组低渗储层特征及影响因素分析  

Structural characteristics of micro-pores and factors controlling low-permeability reservoirs in the Huangliu Formation in the Dongfang area,Yinggehai Basin

作　　者：谢玉洪 张亚[2] 张哨楠[3,4] 张迎朝 刘景环 

机构地区：[1]中海石油(中国)有限公司湛江分公司,广东湛江524057 [2]中国石油西南油气田分公司勘探开发研究院,成都610041 [3]油气藏地质及开发工程国家重点实验室(西南石油大学),成都610500 [4]西南石油大学地球科学与技术学院,成都610500

出　　处：《石油实验地质》2015年第5期541-547,共7页Petroleum Geology & Experiment

摘　　要：以恒速压汞实验为基础,对莺歌海盆地东方区黄流组储层微观孔隙结构特征以及影响因素进行分析。数据表明,东方区黄流组低渗储层平均孔隙半径约为100~140μm,平均喉道半径约为1~5μm,主流喉道半径小于5μm。孔隙半径对渗透率影响较小,喉道半径以及主流喉道半径随着渗透率的降低而减小,分布范围变窄;孔喉比随着渗透率的降低而增大,分布范围变宽。研究区储层较低的渗透率主要是由于储层喉道半径较小造成,而较强压实作用以及自生黏土矿物堵塞喉道是研究区储层孔隙结构差,喉道半径较小的主要原因。Characteristics of micro-pore structures and factors controlling the low-permeability reservoirs in the Huangliu Formation in the Dongfang area of the Yinggehai Basin were studied by mercury injection experiments with constant rates. The average pore radius of the reservoirs is about 100-140 μm,the average throat radius is about 1-5 μm,and the mainstream throat radius is less than 5 μm. The permeability is not correlated with pore radius,and reservoirs with different permeabilities can have similar pore radius distributions. In contrast,permeability is strongly associated with throat radius and its distribution. The throat radius and the mainstream throat radius decrease as permeability becomes lower,and the distribution range gets narrower. The throat to pore ratio increases as permeability decreases,and its distribution range becomes wider. The low permeability of rocks in the study area can be explained by their small throat radius. Strong compaction effects and authigenic clay minerals are the main factors which undermine the micro-pore structures and make the permeability low.

关 键 词：恒速压汞 孔隙半径 喉道半径 孔喉比 黄流组 东方区 莺歌海盆地 

分 类 号：I122.2[文学—世界文学]