【摘要】 通过模拟埋藏条件下碳酸盐岩与乙酸的溶解环境对南堡凹陷及周边7个古生界碳酸盐岩典型样品进行研究。结果表明:在相同流速不同温压下,碳酸盐岩的溶解速率随温压的升高而增大;在温压较低的环境中,白云石的溶解速率低于方解石,随温压的升高白云岩逐渐变得比灰岩更易溶解,而对于含有白云石的灰岩来说,其白云石含量(白云岩化程度)越高则其溶解速率越大;在相同压力不同温度和流速下,马家沟组灰岩的溶解速率随温度升高而"先增后减",在200~250℃时达到最大;白云岩及灰质白云岩等富含白云石的碳酸盐岩更有利于溶蚀空间及潜山内幕优质储层的形成。更多还原

【Abstract】 To study the dissolution characteristics of samples in the burial conditions,a series of experiments were conducted to analyze seven Paleozoic carbonate rock samples collected from Nanpu sag and its surrounding areas,and their associated acetic acid conditions. The results show that the carbonate dissolution rate increases with the temperature and pressure increasing under the same flow rate. In the cases of lower temperature and pressure,the dissolution rate of dolomite is less than that of calcite. With temperature and pressure increasing,dolomite becomes easier to dissolve than limestone. For dolomite bearing limestone,the more dolomite content( or the dolomitization degree),the higher dissolution rate. Under the condition of the same pressure but different temperature and flow rate,the dissolution rate of limestone in the Majiagou formation increases with temperature from 200-250 ℃,reaches its maximum at about 250 ℃,and then decreases with temperature increasing when it is higher than 250 ℃. Combining with the analysis of buried hill reservoir in outcrop observation and physical property data,we conclude that compared with limestone,dolomite,dolomitic carbonate and lime dolomite are more conducive to form dissolution space and high-quality reservoir inner buried hill.更多还原