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Open AccessArticle

Hydrothermal Dolomite Paleokarst Reservoir Development in Wolonghe Gasfield, Sichuan Basin, Revealed by Seismic Characterization

by Bole Gao 1, Fei Tian 2,3,4,5,*, Renfang Pan 1, Wenhao Zheng 2,3,4,5, Rong Li 6, Tianjun Huang 7 and Yisheng Liu 1
1
School of Geosciences, Yangtze University, Wuhan 430100, China
2
Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
3
Frontier Technology and Equipment Development Center for Deep Resources Exploration, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
4
Chinese Academy of Sciences University, Beijing 100049, China
5
The Institutes of Earth Science, Chinese Academy of Sciences, Beijing 100029, China
6
Sinopec Exploration Company, Chengdu 610041, China
7
Research Institute of Exploration and Development, PetroChina Southwest Oil & Gas Field Company, Chengdu 610041, China
*
Author to whom correspondence should be addressed.
Water 2020, 12(2), 579; https://doi.org/10.3390/w12020579
Received: 15 January 2020 / Revised: 16 February 2020 / Accepted: 18 February 2020 / Published: 20 February 2020
(This article belongs to the Special Issue Recent Advances in Karstic Hydrogeology)
Hydrothermal dolomite paleokarst reservoir is a type of porous carbonate reservoir, which has a secondary porosity and can store a large amount of oil and gas underground. The reservoir is formed by magnesium-rich hydrothermal fluids during the karstification and later stages of the transformation. Due to the strong heterogeneity and thin thickness of hydrothermal dolomite paleokarst reservoirs, it is a real challenge to characterize the spatial distribution of the reservoirs. In this paper, we studied the hydrothermal dolomite paleokarst reservoir in the Wolonghe gasfield of the eastern Sichuan Basin. First, based on detailed observations of core samples, the characteristics and storage space types of the dolomite reservoir were described. Secondly, the petrophysical parameters of the paleokarst reservoirs were analyzed, and then the indicator factor for the dolomite reservoirs was established. Thirdly, using the time–depth conversion method, the geological characteristics near boreholes were connected with a three-dimensional (3D) seismic dataset. Several petrophysical parameters were predicted by prestack synchronous inversion technology, including the P-wave velocity, S-wave velocity, P-wave impedance, and the hydrothermal dolomite paleokarst reservoir indicator factor. Finally, the hydrothermal dolomite paleokarst reservoirs were quantitatively predicted, and their distribution model was built. The 3D geophysical characterization approach improves our understanding of hydrothermal dolomite paleokarst reservoirs, and can also be applied to other similar heterogeneous reservoirs. View Full-Text
Keywords: hydrothermal dolomite paleokarst reservoirs; geophysical identification; 3D spatial distribution; Wolonghe gasfield; Sichuan Basin hydrothermal dolomite paleokarst reservoirs; geophysical identification; 3D spatial distribution; Wolonghe gasfield; Sichuan Basin
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Gao, B.; Tian, F.; Pan, R.; Zheng, W.; Li, R.; Huang, T.; Liu, Y. Hydrothermal Dolomite Paleokarst Reservoir Development in Wolonghe Gasfield, Sichuan Basin, Revealed by Seismic Characterization. Water 2020, 12, 579.

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