含泥碳酸盐岩埋藏条件下溶蚀作用的实验模拟

Experimental simulation of burial dissolution of clay-bearing carbonate

张军涛 吴世祥 唐德海 龙胜祥

Zhang Juntao Wu Shixiang Tang Dehai Long Shengxiang

中国石油化工股份有限公司 石油勘探开发研究院 构造与沉积储层实验室, 北京 100083 2. 中国石油化工股份有限公司 勘探南方分公司, 成都 610041

Laboratory of Structural and Sedimentological Reservoir Geology, SINOPEC Research Institute of Petroleum Exploration & Production, Beijing 100083, China 2. SINOPEC Exploration Southern Company, Chengdu, Sichuan 610041, China

通过实验模拟埋藏条件下含泥碳酸盐岩的溶蚀过程,分析了粘土矿物的富集程度和赋存状态。实验结果显示,随着压力和温度的增加,粘土矿物含量是一个先增加后降低的过程,在80~160℃时达到极值。而粘土矿物的赋存状态从主要分布于裂缝中到包裹状再到残余于裂缝之中。溶蚀率大致随着温度和压力的增加而增加,实验中在160℃、48MPa条件下获得了最高的溶蚀率。碳酸盐岩泥质含量的差异对溶蚀率影响并不是十分明显,粘土矿物的赋存状态似乎更为重要。随着溶蚀作用的继续,粘土矿物对溶蚀作用有一定的影响,在80~120℃时,粘土矿物减缓了溶蚀率增加的速度,但是温压继续增加时,这种影响又有所减弱。

The burial dissolution process of claybearing carbonate was simulated with experiment in order to analyze the enrichment and occurrence of clay mineral. As the increase in pressure and temperature, clay mineral content increased at first and then decreased, with 80-160℃ as the turning point. Clay mineral mainly existed in crack, inclusion and residual crack. Dissolution rate increased as temperature and pressure increased, and obtained the biggest value at 160℃ and 48 MPa in experiment. The influence of clay content in carbonate on dissolution rate was not obvious, while the occurrence of clay mineral played a more important role. As dissolution continued, clay mineral delayed the increase of dissolution rate at 80-120℃; however, the influence weakened as temperature and pressure continued increasing.

国家重点基础研究发展计划(973计划)项目(2012CB214802);国家科技重大专项(2011ZX05005002)资助

https://doi.org/10.11781/sysydz201302220