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石油实验地质  2017, Vol. 39 Issue (5): 716-723    DOI: 10.11781/sysydz201705716
方法·技术 本期目录 | 过刊浏览 |
基于埋藏溶蚀模拟实验的白云岩储层孔隙效应研究——以塔里木盆地下寒武统肖尔布拉克组为例
郑剑锋1,2, 沈安江1,2, 黄理力1,2, 陈永权3, 佘敏1,2
1. 中国石油集团 碳酸盐岩储层重点实验室, 杭州 310023;
2. 中国石油 杭州地质研究院, 杭州 310023;
3. 中国石油 塔里木油田分公司, 新疆 库尔勒 841000
Pore effect of dolomite reservoirs based on burial dissolution simulation: A case study of the Lower Cambrian Xiaoerbulake Formation in the Tarim Basin
Zheng Jianfeng1,2, Shen Anjiang1,2, Huang Lili1,2, Chen Yongquan3, She Min1,2
1. CNPC Key Laboratory of Carbonate Reservoir, Hangzhou, Zhejiang 310023, China;
2. PetroChina Hangzhou Research Institute of Geology, Hangzhou, Zhejiang 310023, China;
3. PetroChina Tarim Oil Field Company, Korla, Xinjiang 841000, China
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摘要: 埋藏溶蚀作用是白云岩储层发育的控制因素之一,但其对储层的孔隙效应不清,从而制约埋藏溶蚀型白云岩储层的评价与勘探。以塔里木盆地下寒武统肖尔布拉克组白云岩为例,优选藻砂屑白云岩、叠层石白云岩和凝块石白云岩3种最常见的岩相为样品,用0.2%的乙酸溶液代表埋藏环境中的有机酸,开展高温高压条件下、开放连续流动体系中的储层溶蚀模拟实验。实验结果显示,不同温压条件、不同岩相特征样品的孔隙度都有所增大,但渗透率呈指数级增大;藻砂屑白云岩的储集空间类型从孔隙型演变为孔隙—孔洞型,叠层石白云岩和凝块石白云岩的储集空间类型从孔隙型演变为溶孔—溶缝型。由此说明在埋藏环境中,有机酸对白云岩具有较强的溶蚀性,白云岩储层的初始孔隙结构控制着最终储集空间类型;埋藏溶蚀作用从开始相对均匀溶蚀逐渐转变为非均匀溶蚀,导致溶孔、溶缝非均质发育,局部孔隙间连通性变好。因此埋藏溶蚀作用对改善白云岩储层渗透率的贡献更大。
关键词 埋藏溶蚀模拟实验孔隙效应白云岩储层肖尔布拉克组塔里木盆地    
Abstract:Burial dissolution is one of the important factors which control the development of dolomite reservoirs, but its effect on porosity is still not clear, which restricts the evaluation and exploration of burial dissolution dolomite reservoirs. This study took arene dolomites, stromatolite dolomites and thrombolite dolomites of the Lower Cambrian Xiaoerbulake Formation in the Tarim Basin as an example, used 0.2% acetic acid solution instead of organic acids of burial environment, carried out dissolution simulation experiments of dolomite reservoirs in the condition of high temperature and high pressure. The results showed three different samples' porosity was improved in different temperatures and pressures, but their permeability increased exponentially. The reservoir space of arene dolomites changed from pores to pores and vugs, while the reservoir space of stromatolite dolomites and thrombolite dolomites changed from pores to pores and solution fractures. It implied that organic acid had a strong solubility to dolomites, and the initial pore structure controlled the final reservoir space type. With the dissolution from homogeneous to heterogeneous, the vugs and solution fractures developed heterogeneously, and reservoir connectivity was partly improved. So, burial dissolution is of great importance in reforming the permeability of dolomite reservoirs.
Key wordsburial dissolution    simulation experiment    porosity effect    dolomite reservoir    Xiaoerbulake Formation    Tarim Basin
收稿日期: 2017-05-13     
ZTFLH:  TE122.21  
基金资助:国家重大科技专项(2016ZX05004002)及中国石油天然气股份有限公司科技部项目(2016B-04)资助。
作者简介: 郑剑锋(1977—),男,硕士,高级工程师,从事碳酸盐岩沉积储层研究.E-mail:zhengjf_hz@petrochina.com.cn.
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引用本文:

郑剑锋, 沈安江, 黄理力, 陈永权, 佘敏. 基于埋藏溶蚀模拟实验的白云岩储层孔隙效应研究——以塔里木盆地下寒武统肖尔布拉克组为例[J]. 石油实验地质, 2017, 39(5): 716-723.
Zheng Jianfeng, Shen Anjiang, Huang Lili, Chen Yongquan, She Min. Pore effect of dolomite reservoirs based on burial dissolution simulation: A case study of the Lower Cambrian Xiaoerbulake Formation in the Tarim Basin. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(5): 716-723.

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http://www.sysydz.net/CN/10.11781/sysydz201705716      或      http://www.sysydz.net/CN/Y2017/V39/I5/716

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