邹高峰,郭肖,朱争,苏明,张砚,高涛
ZOU Gaofeng,GUO Xiao,ZHU Zheng,SU Ming,ZHANG Yan,GAO Tao

• 1:西南石油大学油气藏地质及开发工程国家重点实验室
• 2:陕西延长石油(集团)有限责任公司研究院
• 3:中国石油西南油气田分公司川西北气矿

摘要(Abstract)：

为研究川东北地区元坝气田高含硫气藏中酸性气体对海相碳酸盐岩储层物性的影响,利用取样的海相碳酸盐岩岩心,通入不同配比的酸性气体(H2S或CO_2),模拟地层温度(121℃)、地层压力(50 MPa)条件,开展酸性气体下的水岩反应实验。实验表明:高温高压水岩反应后,岩心相对分子质量总体呈现减小的趋势,质量改变率最高达到7. 41%;储层岩心渗透率和孔隙度总体呈现增长趋势,渗透率增长幅度最高达644. 99%,孔隙度增长幅度最高达53. 84%;不同酸性气体质量浓度和气体组成对岩心矿物溶蚀效果不一致,单一酸性气体比混合酸性气体的溶蚀效果好,H_2S气体比CO_2气体对储层岩石的溶蚀效果好;酸性气体在地层高温高压环境下对海相碳酸盐岩具有明显的酸蚀改造作用,水岩反应后酸性气体不仅能溶蚀矿物,造成孔隙度、渗透率的增大,还存在矿物溶蚀颗粒运移沉淀堵塞部分岩石孔隙喉道的现象。
In order to study the influence of the acid gas on the physical properties of the marine carbonate in the high-sulfur gas reservoir in Yuanba Gas Field of Northeast Sichuan,by means of the sampled marine carbonate core,the water-rock reaction experiment of the acid gas was conducted under the conditions of different prepared ratios of the acid gases( H_2 S or CO_2),simulating strata temperature( 121 ℃) and formation pressure( 50 MPa).The experiment shows that after the high-temperature and high-pressure water-rock reaction,the relative molecular mass of the core presents a decreasing trend in a whole,the changed ratio of the mass can reach 7. 41% to the most; while the porosity and permeability generally show an increasing trend,the increased ratio of the permeability can up to 644. 99%,and that of the porosity can reach 53. 84%; different concentrations and compositions of the acidic gas may lead to inconsistent dissolved effects for the minerals,while the corresponding effect of the single acid gas is better than that of the mixed acidic gases,the corroded effect of the acidic gas H_2 S to the reservoir rock isbetter than that of the CO_2; the acid gases indeed have obvious acid corrosion and reformation to the marine carbonate rock under the conditions of high temperature and high pressure in the strata,the acid gases after the water-rock reaction can not only dissolve the minerals and enlarge the porosity and permeability,but also make the dissolved mineral particles migrated and subsided and finally blocked the partial pore throats of the rocks.

关键词(KeyWords)： 高含硫气藏;酸性气体;CO2;H2S;海相碳酸盐岩;水岩反应;元坝气田;川东北地区
high-sulfur gas reservoir;acid gas;CO2;H2S;marine carbonate;water-rock chemical reaction;Yuanba Gas Field;Northeast Sichuan

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项子课题“复杂生物礁气藏精细数值模拟”(2016ZX05017-005-005)

作者(Author): 邹高峰,郭肖,朱争,苏明,张砚,高涛
ZOU Gaofeng,GUO Xiao,ZHU Zheng,SU Ming,ZHANG Yan,GAO Tao

DOI: 10.19597/J.ISSN.1000-3754.201805020

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