Influences of delta sandstone architecture on waterflooding sweep characteristics: A case study of layer J-II of Kumkol South oilfield in South Turgay Basin, Kazakstan

Taking layer J-II of Upper Jurassic of Kumkol South oilfield in South Turgay Basin, Kazakstan as an example, the article studied the architecture characteristics and heterogeneity of delta sandstones, and determined the influence of sandstone architecture on waterflooding sweep characteristics using...

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Main Authors: Lun ZHAO, Jincai WANG, Li CHEN, Xiangzhong ZHANG, Haili CAO, Chenggang WANG, Liangdong ZHAO
Format: Article
Language:English
Published: KeAi Communications Co., Ltd. 2017-06-01
Series:Petroleum Exploration and Development
Online Access:http://www.sciencedirect.com/science/article/pii/S1876380417300502
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author Lun ZHAO
Jincai WANG
Li CHEN
Xiangzhong ZHANG
Haili CAO
Chenggang WANG
Liangdong ZHAO
author_facet Lun ZHAO
Jincai WANG
Li CHEN
Xiangzhong ZHANG
Haili CAO
Chenggang WANG
Liangdong ZHAO
author_sort Lun ZHAO
collection DOAJ
description Taking layer J-II of Upper Jurassic of Kumkol South oilfield in South Turgay Basin, Kazakstan as an example, the article studied the architecture characteristics and heterogeneity of delta sandstones, and determined the influence of sandstone architecture on waterflooding sweep characteristics using fine characterization of sandstones, comprehensive interpretation of waterflooded layers, statistical analysis of production and injection profiles, reservoir numerical simulation methods. The result shows that the delta sandstones have a complex architecture of mosaic structure with mudstone baffles and mud-interbeds, and the sandstone architecture controls the sweeping characteristics of waterflood: due to impermeable or low permeable boundaries between single sand bodies, and lateral and vertical blocking of underwater distributaries bay mudstone, sands in delta have very complicated architecture, and the injected water flows priorly into underwater distributaries channel sand and estuary bar sand with better physical properties, making these two types of sands suffer stronger warterflooding, and have higher recovery degree and better waterflooding sweep effect in plane. Inside single sand bodies, on the one hand, underwater distributaries channel sand and estuary bar sand have high vertical producing degree and good waterflooding sweep effect because mud interbeds in the sands have vertical blocking and shunt effect on injected water; on the other hand, these two types of sands have inhomogeneous waterflood sweeping because of large permeability difference and high development of dominant water channels. In contrast, made up of thin homogeneous fine sand with poor physical properties, lateral sheet sand often has even water-flooding and poor waterflooding sweep effect. Key words: Kazakstan, South Turgay Basin, delta, sandstone architecture, heterogeneity, waterflooding sweep characteristics, warterflooding characteristics
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spelling doaj.art-9fbc0869ddfc49c3842d74a3c41c58c92022-12-21T17:25:57ZengKeAi Communications Co., Ltd.Petroleum Exploration and Development1876-38042017-06-01443437445Influences of delta sandstone architecture on waterflooding sweep characteristics: A case study of layer J-II of Kumkol South oilfield in South Turgay Basin, KazakstanLun ZHAO0Jincai WANG1Li CHEN2Xiangzhong ZHANG3Haili CAO4Chenggang WANG5Liangdong ZHAO6PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, ChinaCorresponding author; PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, ChinaPetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, ChinaPetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, ChinaPetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, ChinaPetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, ChinaPetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, ChinaTaking layer J-II of Upper Jurassic of Kumkol South oilfield in South Turgay Basin, Kazakstan as an example, the article studied the architecture characteristics and heterogeneity of delta sandstones, and determined the influence of sandstone architecture on waterflooding sweep characteristics using fine characterization of sandstones, comprehensive interpretation of waterflooded layers, statistical analysis of production and injection profiles, reservoir numerical simulation methods. The result shows that the delta sandstones have a complex architecture of mosaic structure with mudstone baffles and mud-interbeds, and the sandstone architecture controls the sweeping characteristics of waterflood: due to impermeable or low permeable boundaries between single sand bodies, and lateral and vertical blocking of underwater distributaries bay mudstone, sands in delta have very complicated architecture, and the injected water flows priorly into underwater distributaries channel sand and estuary bar sand with better physical properties, making these two types of sands suffer stronger warterflooding, and have higher recovery degree and better waterflooding sweep effect in plane. Inside single sand bodies, on the one hand, underwater distributaries channel sand and estuary bar sand have high vertical producing degree and good waterflooding sweep effect because mud interbeds in the sands have vertical blocking and shunt effect on injected water; on the other hand, these two types of sands have inhomogeneous waterflood sweeping because of large permeability difference and high development of dominant water channels. In contrast, made up of thin homogeneous fine sand with poor physical properties, lateral sheet sand often has even water-flooding and poor waterflooding sweep effect. Key words: Kazakstan, South Turgay Basin, delta, sandstone architecture, heterogeneity, waterflooding sweep characteristics, warterflooding characteristicshttp://www.sciencedirect.com/science/article/pii/S1876380417300502
spellingShingle Lun ZHAO
Jincai WANG
Li CHEN
Xiangzhong ZHANG
Haili CAO
Chenggang WANG
Liangdong ZHAO
Influences of delta sandstone architecture on waterflooding sweep characteristics: A case study of layer J-II of Kumkol South oilfield in South Turgay Basin, Kazakstan
Petroleum Exploration and Development
title Influences of delta sandstone architecture on waterflooding sweep characteristics: A case study of layer J-II of Kumkol South oilfield in South Turgay Basin, Kazakstan
title_full Influences of delta sandstone architecture on waterflooding sweep characteristics: A case study of layer J-II of Kumkol South oilfield in South Turgay Basin, Kazakstan
title_fullStr Influences of delta sandstone architecture on waterflooding sweep characteristics: A case study of layer J-II of Kumkol South oilfield in South Turgay Basin, Kazakstan
title_full_unstemmed Influences of delta sandstone architecture on waterflooding sweep characteristics: A case study of layer J-II of Kumkol South oilfield in South Turgay Basin, Kazakstan
title_short Influences of delta sandstone architecture on waterflooding sweep characteristics: A case study of layer J-II of Kumkol South oilfield in South Turgay Basin, Kazakstan
title_sort influences of delta sandstone architecture on waterflooding sweep characteristics a case study of layer j ii of kumkol south oilfield in south turgay basin kazakstan
url http://www.sciencedirect.com/science/article/pii/S1876380417300502
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