石油勘探与开发 >

2016 , Vol. 43 >Issue 4: 564 - 572

DOI: https://doi.org/10.11698/PED.2016.04.08

油气勘探

碳酸盐岩溶蚀规律与孔隙演化实验研究

  • 佘敏 ,
  • 寿建峰 ,
  • 沈安江 ,
  • 潘立银 ,
  • 胡安平 ,
  • 胡圆圆
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  • 1. 中国石油杭州地质研究院；
    2. 中国石油集团碳酸盐岩储集层重点实验室
佘敏（1983-）,男,安徽六安人,硕士,中国石油杭州地质研究院工程师,主要从事油气储集层实验地质方面的研究。地址：浙江省杭州市西湖区西溪路920号,杭州地质研究院,邮政编码：310023。E-mail: shem_hz@petrochina.com.cn

网络出版日期: 2016-11-02

基金资助

国家科技重大专项“大型油气田及煤层气开发”（2016ZX05004-002）;中国石油集团科技重大专项“深层油气勘探开发关键技术研究”（2014E-32-02

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Experimental simulation of dissolution law and porosity evolution of carbonate rock

  • SHE Min ,
  • SHOU Jianfeng ,
  • SHEN Anjiang ,
  • PAN Liyin ,
  • HU Anping ,
  • HU Yuanyuan
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  • 1. PetroChina Hangzhou Institute of Geology, Hangzhou 310023, China;
    2. Key Laboratory of Carbonate Reservoir, CNPC, Hangzhou 310023, China

Online published: 2016-11-02

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摘要

通过流体在岩石内部孔隙中运移与反应的实验方式,开展0.2%乙酸与4种类型碳酸盐岩的溶蚀实验,对溶蚀作用的控制因素及溶蚀效应进行研究。结果显示碳酸盐岩溶蚀量与温度呈反比、与压力成正比,且温度效应大于压力效应,因此浅埋藏低温环境是碳酸盐岩规模溶孔形成的有利条件。定量对比溶蚀前后孔隙体积和渗透率的变化,以及岩石内部孔隙演化,指出孔隙结构明显控制碳酸盐岩溶蚀效应和溶孔演化。孔隙型白云岩的孔隙分布具均质性,经历溶蚀后,孔隙体积和渗透率相应增加,且增加的是基质孔隙,储集空间类型保持为孔隙型;孔隙型灰岩由于初始孔隙和组构非均质性强,溶蚀导致孔隙体积和渗透率增加均较显著,但增加的是裂缝型孔隙,储集空间类型演化为缝洞型;溶蚀对裂缝-孔隙型白云岩和裂缝型灰岩的渗透率改善显著,渗透率增加2~3个数量级,且主要增加沿溶缝发育的孔（洞）,储集空间类型演化为缝洞型。图5表4参20

关键词： 碳酸盐岩; 溶蚀实验; 溶蚀量; 孔隙演化; 温度效应; 压力效应

本文引用格式

佘敏 , 寿建峰 , 沈安江 , 潘立银 , 胡安平 , 胡圆圆 . 碳酸盐岩溶蚀规律与孔隙演化实验研究[J]. 石油勘探与开发, 2016 , 43(4) : 564 -572 . DOI: 10.11698/PED.2016.04.08

Abstract

Experiments of acetic acid (initial 0.2%) with porous dolostone, fractured-porous-vuggy dolostone, porous limestone and fractured limestone were done in a continuous flow diagenesis simulation system to find out the controlling factor of dissolution and dissolution effect. The results show that the dissolution quantity of carbonate rock inversely proportional to temperature and directly proportional to pressure, and the temperature effect is greater than the pressure effect. Therefore, relatively shallow burial and lower temperature environment is more beneficial to the formation of large scale carbonate dissolution pores. Quantitative comparison of porosity volume and permeability variation, and evolution of pores inside the rock before and after the experiment show that pore structure has apparent control over the carbonate dissolution and pore evolution. After dissolution, porous dolomite with homogeneous pore distribution saw rise in pore volume (matrix pore volume) and permeability, and remained as pore type in terms of reservoir space; porous limestone, with significant heterogeneity in original pores and texture, saw significant increase in pore volume and permeability, but the increased pores were fracture type, so its reservoir space turned into fracture-pore type; dissolution increased the permeability of fracture-pore dolomite and fracture limestone remarkably by 2-3 orders of magnitude; and the pores increased were mainly along dissolution fractures, turning the reservoir space into fracture-cave type.

Key words： carbonate rock; dissolution quantity; dissolution law; pore evolution; temperature effect; pressure effect

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