DENSIFICATION PROCESS OF UPPER SINIAN DENGYING FORMATION, SICHUAN

LIU Shu-gen, MA Yong-sheng, HUANG Wen-ming, CAI Xun-Yu, ZHANG Chang-jun,WANG Guo-zhi, XU Guo-sheng, YONG Zi-quan, PAN Chang-lin

doi:10.11764/j.issn.1672-1926.2007.04.485

Natural Gas Geoscience >

2007 , Vol. 18 >Issue 4: 485 - 496

DOI: https://doi.org/10.11764/j.issn.1672-1926.2007.04.485

DENSIFICATION PROCESS OF UPPER SINIAN DENGYING FORMATION, SICHUAN

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(1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology,Chengdu 610059, China; 2. South Exploration and Exploitation Subsidiary Company of SINOPEC, Kunming 650200, China)

Online published: 2007-08-10

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Abstract

The Dengying Formation of the Upper Sinian Series is one of the oldest reservoir rocks in the world. It is such an old age, deep burial and complex diagenesis t

hat the reservoir is more and more tight. The study of the densification process of the formation is the precondition to probe into the formation mechanism of good reservoirs in the formation, and is an effective approach to explore the evolution process and characteristics of the marine carbonate reservoirs in the sup

erimposed sedimentary basins in west China. In general, the thickness of the Dengying Formation is 300~1 200 m. It mainly consists of algal dolomite and crystalline dolomite, and occasionally saddle dolomite. The main dolomitization in the formation is penecontemporaneous and burial dolomitization. There are also conditions for the occurence of hypergene dolomitization and hydrothermal dolomitization in the formation. The fracture cavity is the main storage space, and the matrix porosity is low (1%~2%). There are some similarities of the infillings in pores and cavities in the formation in different regions of the Sichuan Basin. Dissolution is the necessary condition for the formation of good reservoirs, including the hypergene karstification, burial dissolution and structure (folding) karstification. Silicatization is an important factor, which makes the Dengying Formation tight. The silicatization took place many times with many types. The densification process of the crystalline dolomite is as follows: the compaction during early diagenesis and the sparry cementation in fenestra (reducing about 40%~45% porosity)→early silicatization/recrystallization (little or no change of porosity)→the uplifted dissolution/infilling (or standing burial)→(reburial)presolution/recrystallization (hydrocarbon infilling)→the dissolution during deep burial?infilling and recrystallization→the fracturing of tectonic uplift brecciation (or standing burial)→the leaching of freshwater silicatization dedolomitization (or standing burial)→infilling. The densification process of the grain dolomite is as follows: the cementation (minor dissolution) of freshwater, seawater and the mixing water of freshwater and seawater (reducing 10%~20% porosity→compaction→Hypergene karstification→silicatization/recrystallization → presolution/tectonic karstification/recrystallization/dissolution during deep

burial infilling (hydrocarbon infilling)→uplift/tectonic fracture (or standing burial) dissolution/silicatization/infilling.

Key words： Reservoir rock; Densification process; Dengying Formatio; Upper Sinian Series; Sichuan basin

Cite this article

LIU Shu-gen, MA Yong-sheng, HUANG Wen-ming, CAI Xun-Yu, ZHANG Chang-jun,WANG Guo-zhi, XU Guo-sheng, YONG Zi-quan, PAN Chang-lin . DENSIFICATION PROCESS OF UPPER SINIAN DENGYING FORMATION, SICHUAN[J]. Natural Gas Geoscience, 2007 , 18(4) : 485 -496 . DOI: 10.11764/j.issn.1672-1926.2007.04.485

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