石油勘探与开发 >

2020 , Vol. 47 >Issue 5: 958 - 971

DOI: https://doi.org/10.11698/PED.2020.05.10

油气勘探

滨里海盆地东缘石炭系碳酸盐岩储集层孔喉结构特征及对孔渗关系的影响

  • 李伟强 ,
  • 穆龙新 ,
  • 赵伦 ,
  • 李建新 ,
  • 王淑琴 ,
  • 范子菲 ,
  • 邵大力 ,
  • 李长海 ,
  • 单发超 ,
  • 赵文琪 ,
  • 孙猛
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  • 1.中国石油杭州地质研究院,杭州 310023;
    2.中国石油勘探开发研究院,北京 100083;
    3.北京大学地球与空间科学学院,北京 100871
李伟强(1990-),男,河南柘城人,博士,中国石油杭州地质研究院工程师,主要从事油气田开发地质方面的研究工作。地址:杭州市西湖区西溪路920号,中国石油杭州地质研究院海洋油气地质研究所,邮政编码:310023。E-mail:liwq_hz@petrochina.com.cn

收稿日期: 2019-01-16

  修回日期: 2020-06-20

  网络出版日期: 2020-09-22

基金资助

国家科技重大专项(2017ZX05030-002);中国石油天然气集团有限公司科学研究与技术开发项目“海外海域油气地质条件与关键评价技术研究”(2019D-4309)

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Pore-throat structure characteristics and their impact on the porosity and permeability relationship of Carboniferous carbonate reservoirs in eastern edge of Pre-Caspian Basin

  • LI Weiqiang ,
  • MU Longxin ,
  • ZHAO Lun ,
  • LI Jianxin ,
  • WANG Shuqin ,
  • FAN Zifei ,
  • SHAO Dali ,
  • LI Changhai ,
  • SHAN Fachao ,
  • ZHAO Wenqi ,
  • SUN Meng
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  • 1. PetroChina Hangzhou Research Institute of Geology, Hangzhou 310023, China;
    2. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    3. School of Earth and Space Sciences, Peking University, Beijing 100871, China

Received date: 2019-01-16

  Revised date: 2020-06-20

  Online published: 2020-09-22

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摘要

滨里海盆地东缘石炭系碳酸盐岩储集层经受了复杂的沉积、成岩和构造作用,发育孔、洞、缝多种储集空间且组合方式多样,孔喉结构复杂,导致储集层孔渗关系复杂,严重制约储集层分类评价和高效开发。综合岩心、薄片、扫描电镜、高压压汞、常规物性分析及各类测试资料,对孔洞缝型、孔洞型、裂缝-孔隙型和孔隙型储集层的孔喉结构特征、主控因素及对孔渗关系的影响展开系统研究,取得了3项进展:①建立了一套适用于滨里海盆地东缘石炭系复杂碳酸盐岩的孔喉结构分类和描述方法,划分出多模态宽广型、双模态宽广型、单模态集中型和双模态高低不对称型4种孔喉结构类型,构建孔喉结构判别指数实现对孔喉结构类型的定量判别;②明确了孔隙型储集层的微观非均质性最强,4种孔喉结构均发育,其次是裂缝-孔隙型和孔洞缝型储集层,孔洞型储集层微观非均质性相对较弱,阐明了沉积、成岩和构造叠加改造作用形成的储集空间组合类型是孔喉结构差异的主控因素;③揭示了多种孔喉结构共同发育是导致各类储集层孔渗相关性差的关键因素,细分孔喉结构类型建立各类储集层孔渗关系是提高渗透率计算准确度的有效手段。上述研究成果加深了对复杂碳酸盐岩储集层孔喉结构的认识,对碳酸盐岩储集层分类评价、准确建立孔渗关系和高效开发具有较好的指导意义。图13表4参45

关键词： 滨里海盆地; 石炭系; 碳酸盐岩储集层; 孔喉结构; 主控因素; 孔渗关系

本文引用格式

李伟强 , 穆龙新 , 赵伦 , 李建新 , 王淑琴 , 范子菲 , 邵大力 , 李长海 , 单发超 , 赵文琪 , 孙猛 . 滨里海盆地东缘石炭系碳酸盐岩储集层孔喉结构特征及对孔渗关系的影响[J]. 石油勘探与开发, 2020 , 47(5) : 958 -971 . DOI: 10.11698/PED.2020.05.10

Abstract

Carboniferous carbonate reservoirs at the eastern edge of the Pre-Caspian Basin have undergone complex sedimentation, diagenesis and tectonism processes, and developed various reservoir space types of pores, cavities and fractures with complicated combination patterns which create intricate pore-throats structure. The complex pore-throat structure leads to the complex porosity-permeability relationship, bringing great challenges for classification and evaluation of reservoirs and efficient development. Based on the comprehensive analysis on cores, thin sections, SEM, mercury intrusion, routine core analysis and various tests, this paper systematically investigated the features and main controlling factors of pore-throats structure and its impact on the porosity-permeability relationship of the four reservoir types which were pore-cavity-fracture, pore-cavity, pore-fracture and pore, and three progresses are made. (1) A set of classification and descriptive approach for pore-throat structure of Carboniferous carbonate reservoirs applied to the eastern edge of the Pre-Caspian Basin was established. Four types of pore-throat structures were developed which were wide multimodal mode, wide bimodal mode, centralized unimodal mode and asymmetry bimodal mode, respectively. The discriminant index of pore-throat structure was proposed, realizing the quantitative characterization of pore-throat structure types. (2) The microscopic heterogeneity of pore reservoir was the strongest and four types of pore-throat structures were all developed. The pore-fracture and pore-cavity-fracture reservoirs took the second place, and the microscopic heterogeneity of pore-cavity reservoir was the weakest. It was revealed that the main controlling factor of pore-throat structure was the combination patterns of reservoir space types formed by sedimentation, diagenesis and tectonism. (3) It was revealed that the development of various pore-throat structure types was the important factor affecting poroperm relationship of reservoirs. The calculation accuracy of permeability of reservoirs can be improved remarkably by subdividing the pore-throat structure types. This study deepens the understanding of pore-throat structure of complicated carbonate reservoirs, and is conducive to classification and evaluation, establishment of precise porosity-permeability relationship and highly efficient development of carbonate reservoirs.

Key words： Pre-Caspian Basin; Carboniferous; carbonate reservoir; pore-throat structure; main controlling factors; porosity-permeability relationship

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