致密砂砾岩与CO_(2)和水相互作用规律  

Interaction Pattern of Dense Sandstone with CO_(2) and Water

作　　者：张玉龙 施雷庭 兰林[1] 潘宝风[1] 邹天赐 张言亮 王晓 ZHANG Yu-long;SHI Lei-ting;LAN Lin;PAN Bao-feng;ZOU Tian-ci;ZHANG Yan-liang;WANG Xiao(Engineering Technology Research Institute of Sinopec Southwest Oil and Gas Branch,Deyang 618000,China;State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering,Chengdu 610500,China;Engineering Supervision Department of Changqing Oilfield Branch,X'an 710018,China)

机构地区：[1]中国石化西南油气分公司工程技术研究院,德阳618000 [2]油气藏地质与开发工程国家重点实验室,成都610500 [3]长庆油田分公司工程监督处,西安710018

出　　处：《科学技术与工程》2025年第3期1028-1038,共11页Science Technology and Engineering

基　　金：四川省科技计划(2022YFSY0007);四川省国际科技创新合作项目(2023YFH0005)。

摘　　要：为研究吉致密砂砾岩与CO_(2)和水相互作用规律,基于准噶尔盆地玛湖致密砂砾岩油藏储层条件,开展致密砂砾岩与CO_(2)和水相互作用实验。结果表明:CO_(2)溶于水后生成碳酸主要与致密砂砾岩砾石间胶结物中长石、方解石发生化学作用,形成强烈的绕砾溶蚀现象,以溶蚀为主,沉淀为辅,最终使岩石孔隙度和渗透率增加,储层流体渗流能力变强,其中孔隙度和渗透率最大增量分别为3.65%和87.36%。同时,作用后岩石表面粗糙度增加,亲水矿物石英裸露在表面,岩石水相润湿接触角降低7.4°亲水性增强。对CO_(2)吞吐提高原油采收率具有积极作用,主要增油机理包括以下两点:一是增大孔隙空间提高流体渗流能力;二是改善岩石水相润湿性,提高油藏水相渗吸能力和原油流动能力,从而提高原油采收率。Based on the reservoir conditions of tight conglomerate reservoirs in the Mahu area of the Junggar Basin,an experiment was conducted to study the interaction between tight conglomerates,CO_(2),and water.The results indicate that after CO_(2)dissolves in water to form carbonic acid,it primarily reacts chemically with feldspar and calcite in the cement between the conglomerate grains.This leads to significant around-grain dissolution,with dissolution being the main process and precipitation being secondary.Ultimate-ly,this increases the porosity and permeability of the rock,enhancing the reservoir fluid seepage capacity.The maximum increases in porosity and permeability are 3.65%and 87.36%,respectively.Additionally,the surface roughness of the rock increases after the in-teraction,with hydrophilic mineral quartz exposed on the surface.The water-phase wetting contact angle of the rock decreases by 7.4°,enhancing hydrophilicity.The CO_(2)huff and puff process has a positive effect on improving oil recovery,with the main oil-increasing mechanisms being the enlargement of pore space to enhance fluid seepage capacity and the improvement of rock water-phase wettability,which increases reservoir water-phase imbibition capacity and crude oil mobility,thereby improving oil recovery.

关 键 词：致密砂砾岩 CO_(2) 相互作用 渗透率 提高采收率 

分 类 号：TE357[石油与天然气工程—油气田开发工程]