中国石油大学学报（自然科学版）
中國石油大學學報（自然科學版）
중국석유대학학보（자연과학판）
Journal of China University of Petroleum (Edition of Natural Science)
2015年
5期
164-172
,共9页
强碱三元复合驱%孔隙结构%恒速压汞%电子探针
彊堿三元複閤驅%孔隙結構%恆速壓汞%電子探針
강감삼원복합구%공극결구%항속압홍%전자탐침
base ASP flooding%pore structure%rate-controlled mercury penetration%electron probe
储层孔隙结构变化规律是进行强碱三元复合驱后后续水驱和进一步提高采收率方法研究的基础。利用铸体薄片分析、SEM图像、恒速压汞和电子探针结合现场检测等方法,对强碱三元复合驱前后岩样孔隙结构变化进行定性和定量研究。研究表明：强碱三元复合驱后颗粒边界经过强碱溶蚀呈“锯齿状”,石英颗粒去棱角化明显,长石溶蚀严重,同时能够观察到大量溶蚀孔隙,黏土矿物中大量的书页状高岭石被溶蚀,同时在黏土矿物表面出现次生石英；“白色云雾状”垢沉淀充填在孔隙中,主要成分为Ca和Si,同时含有少量Mn、Fe、Ti,结垢造成孔隙结构发生变化,部分孔隙阻塞,使强碱三元复合驱后岩心喉道半径平均值较水驱岩心下降6.528%,孔隙半径平均值下降3.360%,孔喉比分布范围更大,平均增加12.84%。
儲層孔隙結構變化規律是進行彊堿三元複閤驅後後續水驅和進一步提高採收率方法研究的基礎。利用鑄體薄片分析、SEM圖像、恆速壓汞和電子探針結閤現場檢測等方法,對彊堿三元複閤驅前後巖樣孔隙結構變化進行定性和定量研究。研究錶明：彊堿三元複閤驅後顆粒邊界經過彊堿溶蝕呈“鋸齒狀”,石英顆粒去稜角化明顯,長石溶蝕嚴重,同時能夠觀察到大量溶蝕孔隙,黏土礦物中大量的書頁狀高嶺石被溶蝕,同時在黏土礦物錶麵齣現次生石英；“白色雲霧狀”垢沉澱充填在孔隙中,主要成分為Ca和Si,同時含有少量Mn、Fe、Ti,結垢造成孔隙結構髮生變化,部分孔隙阻塞,使彊堿三元複閤驅後巖心喉道半徑平均值較水驅巖心下降6.528%,孔隙半徑平均值下降3.360%,孔喉比分佈範圍更大,平均增加12.84%。
저층공극결구변화규률시진행강감삼원복합구후후속수구화진일보제고채수솔방법연구적기출。이용주체박편분석、SEM도상、항속압홍화전자탐침결합현장검측등방법,대강감삼원복합구전후암양공극결구변화진행정성화정량연구。연구표명：강감삼원복합구후과립변계경과강감용식정“거치상”,석영과립거릉각화명현,장석용식엄중,동시능구관찰도대량용식공극,점토광물중대량적서혈상고령석피용식,동시재점토광물표면출현차생석영；“백색운무상”구침정충전재공극중,주요성분위Ca화Si,동시함유소량Mn、Fe、Ti,결구조성공극결구발생변화,부분공극조새,사강감삼원복합구후암심후도반경평균치교수구암심하강6.528%,공극반경평균치하강3.360%,공후비분포범위경대,평균증가12.84%。
The reservoir pore structure change after alkaline-surfactant-polymer ( ASP) flooding is the basis for subsequent water flooding and oil recovery enhancement. The pore structure change before and after ASP flooding was studied qualitative-ly and quantitatively using casting thin sections, SEM image, rate-controlled mercury penetration, and electron probe analy-sis method. It is found that after base ASP flooding the particles boundary present the"zigzag" shape by alkali dissolution. And the angularity removal for quartz grains is significant. The feldspar dissolution is serious, and it can be observed a large number of dissolution pores. A lot of kaolinite in clay mineral is dissoluted, and the secondary quartz on clay mineral surface is found after flooding. "White nebulous" scale fills and blocks in the pores, in which the Ca and Si are dominant, while Mn, Fe and Ti are small. The scale changes the pore structure, and blocks some pores. This causes the average throat radius is dropped by 6. 528% compared with water flooding core, and the average pore radius is reduced by 3. 360%. Also the pore distribution is greater, and it is increased by 12. 84% on average after ASP flooding.
