The origin of carbonate cements and the influence on reservoir quality of Pinghu Formation in Xihu Sag, East China Sea

HUANG Long; TIAN Jingchun; XIAO Ling; WANG Feng

doi:10.3969/j.issn.1673-8926.2008.01.008

Lithologic Reservoirs >

2008 , Vol. 20 >Issue 1: 47 - 52

DOI: https://doi.org/10.3969/j.issn.1673-8926.2008.01.008

The origin of carbonate cements and the influence on reservoir quality of Pinghu Formation in Xihu Sag, East China Sea

HUANG Long ,
TIAN Jingchun ,
XIAO Ling ,
WANG Feng

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State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology,Chengdu 610059, China

Online published: 2008-03-15

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Abstract

Carbonate cements are the most abundant authigenic minerals in the reservoir sandstone of Pinghu Formation in Xihu Sag, East China Sea Basin. The analyses on thin section, cathodoluminescence, and elemental composition and carbon isotope showthat siderite, ankerite and calcite are the main minerals of the carbonate cements in Pinghu Formation. The siderite cement is mainly generated from syngenesis to early diagenesis, with highest δ¹³C ( 0.75‰) and δ¹⁸O ( - 10.22‰) . The δ¹³C of ankerite varies from - 2.45‰ to - 2.98‰, which is concordant with the coeval sea water, and the δ¹⁸O of ankerite is low, with least of - 12.39‰, and occurs during the early diagenetic stage. Granular and poikilitic cementations are the main occurrences of calcite cement. Granular calcite has many origins; however, the origin of the poikilitic calcite cement is closely related to the aluminosilicate minerals and the transformation of clay minerals. The siderite and ankerite precipitated in the early diagenetic stage enhanced the mechanical strength of rock and resistance to compaction, which is favorable for the reservoir quality, while the intergrowth calcite cementation generated in the late period is disadvantageous for the reservoir quality.

Key words： reservoir characteristics; classification evaluation; Yanchang Formation; Ordos Basin

Cite this article

HUANG Long , TIAN Jingchun , XIAO Ling , WANG Feng . The origin of carbonate cements and the influence on reservoir quality of Pinghu Formation in Xihu Sag, East China Sea[J]. Lithologic Reservoirs, 2008 , 20(1) : 47 -52 . DOI: 10.3969/j.issn.1673-8926.2008.01.008

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