准噶尔盆地腹部超压顶面附近深层砂岩碳酸盐胶结作用和次生溶蚀孔隙形成机理

何生; 杨智; 何治亮; 武恒志; 王芙蓉; 孟闲龙

Volume 34 Issue 5

Sep. 2009

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Article Navigation > Earth Science > 2009 > 34(5): 759-768

HE Sheng, YANG Zhi, HE Zhi-liang, WU Heng-zhi, WANG Fu-rong, MENG Xian-long, 2009. Mechanism of Carbonate Cementation and Secondary Dissolution Porosity Formation in Deep-Burial Sandstones near the Top Overpressured Surface in Central Part of Junggar Basin. Earth Science, 34(5): 759-768.

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Mechanism of Carbonate Cementation and Secondary Dissolution Porosity Formation in Deep-Burial Sandstones near the Top Overpressured Surface in Central Part of Junggar Basin

HE Sheng^1
,,
YANG Zhi^{1, 2, 5},
HE Zhi-liang^{3, 5},
WU Heng-zhi^{4, 5},
WANG Fu-rong^{1, 5},
MENG Xian-long^{3, 5}

1.
Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Ministry of Education, Wuhan 430074, China
2.
Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
3.
Research Institute of Petroleum Exploration and Production, SINOPEC, Beijing 100083, China
4.
Southwest Branch Company, SINOPEC, Chengdu 610051, China
5.
West Branch, Research Institute of Petroleum Exploration and Production, SINOPEC, Urumqi 830011, China

Received Date: 2008-12-11
Publish Date: 2009-09-25

Abstract

Abstract

The carbonate cementation and secondary dissolution porosity in the deep-burial sandstones near the top overpressured surface (present-day depths: 4 400-6 200 m and temperatures: 105-145 ℃) in the central part of Junggar Basin are intimately related to the overpressured fluid activities.Periodic decreases of pore pressures and changes of formation hydrochemical conditions as sealing and releasing of overpressures along the top overpressured surface can result the processes of carbonate precipitation and aluminosilicate dissolving in the sandstones.Based on the data of diagenesis, carbonate cement content, sandstone property, carbon and oxygen isotope of carbonate cement, thermal maturity modeling of source rocks and so on, integrated studies indicate as fellows: The ferroan carbonate cements are the dominated cements formed in the late diagenesis stage, and the feldspar-related secondary dissolved pores are the most important pore types in the deep-burial sandstone reservoirs.The thickness scopes are more than 550 m, occurring 100 m below the top overpressured surface and over 450 m above the surface, while the carbonate cement contents reach or exceed the values of 15% to 30%.The thickness intervals are 250-300 m above the top overpressured surface while the carbonate cement contents reach or exceed the values of 25%.The depth intervals of up to 10%-20% secondary dissolving porosity are concomitant with the depth ranges of relative high carbonate cement contents.Since the late Cretaceous, the carbonate-riched fluid flows have been produced frequently as the development of hydrocarbon generation pressures from the deep Jurassic coal-bearing strata, and the carbonate cements have been influenced evidently by the overpressured and thermal fluids, implying that the late-stage ferroan calcite carbon is partly originated from the organic-matter thermal degradation.The secondary porosity zones in the deep-burial sandstones near the top overpressured surface have been formed during the processes of acid-fluid expulsion and migration due to upward releases of overpressures along the diagenetic barrier associated with the top carbonate mineralization zones.
- carbonate cementation,
- secondary dissolution porosity,
- top overpressured surface,
- fluid-rock interaction,
- central part of Junggar basin

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References(69)

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