Experimental dissolution and karst strata association of Middle Permian Maokou carbonate rocks in the northern part of Sichuan Basin

ZHANG Qingyu; JI Shaocong; ZENG Tao; XIA Wenqian; BA Junjie; DONG Hongqi; LIANG Bin

doi:10.11781/sysydz202301175

Volume 45 Issue 1

Jan. 2023

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ZHANG Qingyu, JI Shaocong, ZENG Tao, XIA Wenqian, BA Junjie, DONG Hongqi, LIANG Bin. Experimental dissolution and karst strata association of Middle Permian Maokou carbonate rocks in the northern part of Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(1): 175-184. doi: 10.11781/sysydz202301175

Citation:

ZHANG Qingyu, JI Shaocong, ZENG Tao, XIA Wenqian, BA Junjie, DONG Hongqi, LIANG Bin. Experimental dissolution and karst strata association of Middle Permian Maokou carbonate rocks in the northern part of Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(1): 175-184. doi: 10.11781/sysydz202301175

Citation:

ZHANG Qingyu, JI Shaocong, ZENG Tao, XIA Wenqian, BA Junjie, DONG Hongqi, LIANG Bin. Experimental dissolution and karst strata association of Middle Permian Maokou carbonate rocks in the northern part of Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(1): 175-184. doi: 10.11781/sysydz202301175

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Experimental dissolution and karst strata association of Middle Permian Maokou carbonate rocks in the northern part of Sichuan Basin

doi: 10.11781/sysydz202301175

ZHANG Qingyu^{1, 2
,},
JI Shaocong^{1, 2
,
,},
ZENG Tao³,
XIA Wenqian³,
BA Junjie^{1, 2},
DONG Hongqi^{1, 2},
LIANG Bin^{1, 2}

1.
Institute of Karst Geology of Chinese Academy of Geological Sciences/Karst Dynamics Laboratory of Ministry of Natural Resources, Guilin, Guangxi 541004, China
2.
International Research Centre on Karst under the Auspices of UNESCO/National Center for International Research on Karst Dynamic System and Global Change, Guilin, Guangxi 541004, China
3.
SINOPEC Exploration Company, Chengdu, Sichuan 610041, China

Received Date: 2022-03-24
Rev Recd Date: 2022-11-25
Publish Date: 2023-01-28

Abstract

Abstract

Kart reservoir is important for the Middle Permian Maokou Formation in the northern part of Sichuan Basin. Based on field outcrops and drilling core data, combining both macro and micro methods, the characteristics of karst strata association of the Maokou Formation in this area was studied by the means of thin section observation, scanning electron microscope, major and trace elements and experimental dissolution. The first member of the Maokou Formation is dominated by marl and bioclastic micritic limestone, and the content of acid insoluble matter is high. The second and third members of the Maokou Formation are dominated by micritic bioclastic limestone and bright crystal bioclastic limestone, and the content of acid insoluble matter is low. The results of dissolution experiments show that the mineral type and chemical composition of carbonate rock are the main factors affecting the solubility of rock. The change characteristics of the dissolution rate of samples, solution ion concentration and micro dissolution are as follows: bioclastic limestone>micrite limestone>dolomite>argillaceous limestone. The karst strata association types of the Maokou Formation can be divided into 2 groups, 3 types and 9 subtypes. The karstification conditions and rock dissolution degree of different karst formation types are different, and the development scale of fracture cave karst reservoir is also different.
- dissolution simulation experiment,
- karst strata association,
- karst reservoir,
- Maokou Formation,
- Permian,
- Sichuan basin

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References(18)

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Experimental dissolution and karst strata association of Middle Permian Maokou carbonate rocks in the northern part of Sichuan Basin

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