海相油气地质2013，Vol.18Issue(3)：55-61,7.DOI:10.3969/j.issn.1672-9854.2013.03.007
碳酸盐岩溶蚀机制的实验探讨:表面溶蚀与内部溶蚀对比
Experiment of Dissolution Mechanism of Carbonate Rocks:Surface Dissolution and Internal Dissolution
佘敏 1寿建峰 2贺训云 1王莹 2朱吟 1王永生2
作者信息
- 1. 中国石油杭州地质研究院
- 2. 中国石油集团碳酸盐岩储层重点实验室
- 折叠
摘要
Abstract
In order to study the mechanism of carbonate rocks dissolution in organic acid under the conditions from epigenesist to deep burial digenesis environment,the reactions of acetic acid (initial 0.2％) with six types of carbonate rocks were investigated using two experimental ways of surface dissolution and internal dissolution.The result of surface dissolution indicatesthat dissolution rates of carbonate rocks increase with increasing the temperature and pressure.In the conditions from epigenesis to middle burial digenesis environment,the dissolution rotes of marl and bioclastic wackestone are twice or three times than that of fine crystalline dolostone.In the condition of deep burial environment,the dissolution rates of bioclastic wackestone,marl,and fine crystalline dolostone are basically the same.The result of internal dissolution shows that the dissolving capacity of dolomitic grainstone in acetic acid is greater than that of microcrystalline to fine crystalline dolostone and sparry oolitic dolostone in the conditions at 60℃ and 10MPa.The dissolving capacity of dolomitic grainstone,microcrystalline to fine crystalline dolostone and sparry oolitic dolostone increases with increasing temperature and pressure in acetic acid.When the temperature and pressure reach to or exceed 90℃ and 20 MPa,the dissolving capacity in acetic acid of microcrystalline to fine crystalline dolostone and sparry oolitic dolostone is greater than that of dolomitic grainstone.Based on the results of experiments,it can be predicated that the dissolution rate and solubility of limestone in organic acid is greater than that of dolostone under the conditions of epigenesist and relatively shallow burial environment,so that the dissolution capacity of limestone must be greater than that of dolostone.Under the deep burial condition,dolostone has greater dissolution capacity and the similar dissolution rate with limestone.This maybe is one of the most important reasons why dolomite reservoirs with secondary porosity are more than limestone reservoirs in relatively deep strata.关键词
碳酸盐岩/模拟实验/溶蚀作用/化学动力学/化学热力学Key words
Carbonate rocks/ Simulation experiment/ Dissolution/ Chemical thermodynamics/ Chemical kinetics分类
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佘敏,寿建峰,贺训云,王莹,朱吟,王永生..碳酸盐岩溶蚀机制的实验探讨:表面溶蚀与内部溶蚀对比[J].海相油气地质,2013,18(3):55-61,7.
