北京大学学报(自然科学版)

基于模拟实验的原位观察对碳酸盐岩深部溶蚀的再认识

杨云坤1,2,3,刘波2,秦善1,罗平3,张单明1,周明辉3,石开波1,田永净4   

  1. 1. 北京大学地球与空间科学学院, 北京 100871; 2. 北京大学石油与天然气研究中心, 北京 100871; 3. 中国石油勘探开发研究院, 北京 100083; 4. 中国地质大学北京地球科学与资源学院, 北京 100083;
  • 收稿日期:2013-03-21 出版日期:2014-03-20 发布日期:2014-03-20

Re-recognition of Deep Carbonate Dissolution Based on the Observation of in-situ Simulation Experiment

YANG Yunkun1,2,3, LIU Bo2, QIN Shan1, LUO Ping3, ZHANG Shanming1, ZHOU Minghui3, SHI Kaibo1, TIAN Yongjing4   

  1. 1. School of Earth and Space Sciences, Peking University, Beijing 100871; 2. Oil and Gas Research Center, Peking University, Beijing 100871; 3. Research Institute of Petroleum Exploration and Development, Beijing 100083; 4. School of Earth Sciences and Resources, China University of Geosciences Beijing, Beijing 100083;
  • Received:2013-03-21 Online:2014-03-20 Published:2014-03-20

摘要: 结合川东北地区古地温梯度, 利用金刚石压腔(DAC)技术, 针对碳酸盐岩设计了一套全新的随埋深增加的水-岩作用模拟实验。模拟实验结果表明, 随着地层温度、压力升高, 灰岩表现为明显的胶结(沉淀), 白云岩在高温高压的酸性地层流体条件下不比灰岩更易溶蚀, 说明在封闭-半封闭的埋藏过程中碳酸盐岩不存在大范围的“溶蚀窗”。实验结果可能导致对碳酸盐岩深部储层发育机理的重新认识。

关键词: 碳酸盐岩, DAC, 原位, 溶蚀, 沉淀

Abstract: A set of new carbonate dissolution in-situ experiments was designed to simulate the real burying process and to test its affection on fluid-rock reaction. By adoption DAC, the experimental process was controlled by the heater according to the paleothermal gradient of NE Sichuan. Experiment results indicate that limestone show precipitation with the increase of temperature and pressure. Dolomite is more stable than limestone in the whole experimental process, which shows a quite different result from the standpoint that dolomite is more dissoluble than limestone in high temperature and high pressure conditions. The “dissolution window” was not observed in the whole experimental process. The experimental researches may provide some new perspectives to the recognition of the formation and preservation mechanism for the deep carbonate reservoir.

Key words: carbonate, diamond anvil cell, in-situ, dissolution, precipitation

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