Classification and evaluation of low-permeability sand reservoir based on micro-pore structure

The undeveloped low-permeability oil reserves of the Liushagang Formation in the Beibu Gulf Basin are large, but the reservoir quality is poor. The existing classification standards for low-permeability reservoirs cannot meet the needs of fine reservoir evaluation and offshore development.Based on t...

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Main Authors: Xinguang Wang, Chong Zhang, Hui Zhang, Zhaoqiang Yang, Xiaodong Peng, Nan Zhao, Lei Wang
Format: Article
Language:zho
Published: Editorial Department of Bulletin of Geological Science and Technology 2021-07-01
Series:地质科技通报
Subjects:
Online Access:https://dzkjqb.cug.edu.cn/en/article/doi/10.19509/j.cnki.dzkq.2021.0429
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author Xinguang Wang
Chong Zhang
Hui Zhang
Zhaoqiang Yang
Xiaodong Peng
Nan Zhao
Lei Wang
author_facet Xinguang Wang
Chong Zhang
Hui Zhang
Zhaoqiang Yang
Xiaodong Peng
Nan Zhao
Lei Wang
author_sort Xinguang Wang
collection DOAJ
description The undeveloped low-permeability oil reserves of the Liushagang Formation in the Beibu Gulf Basin are large, but the reservoir quality is poor. The existing classification standards for low-permeability reservoirs cannot meet the needs of fine reservoir evaluation and offshore development.Based on the experiments of constant rate mercury injection, high pressure mercury injection, NMR and seepage mechanism, this paper comprehensively analyzed the micro-pore structure and seepage characteristics, and optimized six kinds of reservoir evaluation parameters: reservoir quality index, fractal dimension of pore structure, mainstream throat radius, mean throat radius, percentage of movable fluid and change rate of threshold pressure gradient, meanwhile, the classification limit of various characterization parameters were determined by integrating with the reservoir quality index, reservoir seepage ability evaluation factors and specific productivity index constraint parameters. A comprehensive evaluation criterion for low-permeability oil reservoirs is established based on the Grey Relational Analysis method, which is divided into Ⅰ, Ⅱa, Ⅱb, Ⅲ and Ⅳ from good to bad.Carried out the grading evaluation of low-permeability reserves and the research results provide a theoretical basis for the analysis of the development potential, the research direction of the low-permeability reserves in Beibu Gulf Basin.The results show: types Ⅰand Ⅱa are relatively high-quality low-permeability reserves and have been put into large-scale development.Types Ⅱb and Ⅲ are extra-low-permeability reserves and are difficult to develop, which need to be formulated for experimental development by reasonable technical measures and development models.
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spelling doaj.art-00e219de8355494fa0d3e80056f5cf2e2024-03-05T03:05:11ZzhoEditorial Department of Bulletin of Geological Science and Technology地质科技通报2096-85232021-07-014049310310.19509/j.cnki.dzkq.2021.0429dzkjtb-40-4-93Classification and evaluation of low-permeability sand reservoir based on micro-pore structureXinguang Wang0Chong Zhang1Hui Zhang2Zhaoqiang Yang3Xiaodong Peng4Nan Zhao5Lei Wang6Zhanjiang Branch of CNOOC Ltd., Zhanjiang Guangdong 524057, ChinaZhanjiang Branch of CNOOC Ltd., Zhanjiang Guangdong 524057, ChinaZhanjiang Branch of CNOOC Ltd., Zhanjiang Guangdong 524057, ChinaZhanjiang Branch of CNOOC Ltd., Zhanjiang Guangdong 524057, ChinaZhanjiang Branch of CNOOC Ltd., Zhanjiang Guangdong 524057, ChinaZhanjiang Branch of CNOOC Ltd., Zhanjiang Guangdong 524057, ChinaZhanjiang Branch of CNOOC Ltd., Zhanjiang Guangdong 524057, ChinaThe undeveloped low-permeability oil reserves of the Liushagang Formation in the Beibu Gulf Basin are large, but the reservoir quality is poor. The existing classification standards for low-permeability reservoirs cannot meet the needs of fine reservoir evaluation and offshore development.Based on the experiments of constant rate mercury injection, high pressure mercury injection, NMR and seepage mechanism, this paper comprehensively analyzed the micro-pore structure and seepage characteristics, and optimized six kinds of reservoir evaluation parameters: reservoir quality index, fractal dimension of pore structure, mainstream throat radius, mean throat radius, percentage of movable fluid and change rate of threshold pressure gradient, meanwhile, the classification limit of various characterization parameters were determined by integrating with the reservoir quality index, reservoir seepage ability evaluation factors and specific productivity index constraint parameters. A comprehensive evaluation criterion for low-permeability oil reservoirs is established based on the Grey Relational Analysis method, which is divided into Ⅰ, Ⅱa, Ⅱb, Ⅲ and Ⅳ from good to bad.Carried out the grading evaluation of low-permeability reserves and the research results provide a theoretical basis for the analysis of the development potential, the research direction of the low-permeability reserves in Beibu Gulf Basin.The results show: types Ⅰand Ⅱa are relatively high-quality low-permeability reserves and have been put into large-scale development.Types Ⅱb and Ⅲ are extra-low-permeability reserves and are difficult to develop, which need to be formulated for experimental development by reasonable technical measures and development models.https://dzkjqb.cug.edu.cn/en/article/doi/10.19509/j.cnki.dzkq.2021.0429beibu gulf basinlow-permeability reservoirmicro-pore structureevaluation factor of seepage capacityreservoir classification and evaluation
spellingShingle Xinguang Wang
Chong Zhang
Hui Zhang
Zhaoqiang Yang
Xiaodong Peng
Nan Zhao
Lei Wang
Classification and evaluation of low-permeability sand reservoir based on micro-pore structure
地质科技通报
beibu gulf basin
low-permeability reservoir
micro-pore structure
evaluation factor of seepage capacity
reservoir classification and evaluation
title Classification and evaluation of low-permeability sand reservoir based on micro-pore structure
title_full Classification and evaluation of low-permeability sand reservoir based on micro-pore structure
title_fullStr Classification and evaluation of low-permeability sand reservoir based on micro-pore structure
title_full_unstemmed Classification and evaluation of low-permeability sand reservoir based on micro-pore structure
title_short Classification and evaluation of low-permeability sand reservoir based on micro-pore structure
title_sort classification and evaluation of low permeability sand reservoir based on micro pore structure
topic beibu gulf basin
low-permeability reservoir
micro-pore structure
evaluation factor of seepage capacity
reservoir classification and evaluation
url https://dzkjqb.cug.edu.cn/en/article/doi/10.19509/j.cnki.dzkq.2021.0429
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