Origin analysis of carbonate cements in Chang 8 reservoir in southeastern margin of Ordos Basin

  • TAN Kaijun ,
  • XU Duonian ,
  • YIN Lu ,
  • DAI Dongdong ,
  • QI Wen
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  • 1. School of Resources and Environment, Southwest Petroleum University, Chengdu 610500, China; 2. Downhole Service Company, CNPC Chuanqing Drilling Engineering Company Limited, Chengdu 610051, China; 3. State Key Laboratory of Oil and Gas Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China

Online published: 2011-08-20

Abstract

Carbonate cements are the most important authigenic minerals in Chang 8 reservoir in southeastern margin of Ordos Basin, and they are mainly ferrocalcite, with some dolomite and ferrodolomite. Based on thin slice and SEM inspection, inclusion enclave temperature measurement, carbon and oxygen isotope analysis and potassium ferricyanide coloring analysis, it is proved that calcite cementation started from the early diagenetic stage and lasted to the late diagenetic stage of B stage. In the early diagenetic stage, there generated light calcites, while to the late diagenetic stage, there generated a great quantity of ferrocalcites because of the organic material decarboxylation under thermocatalysis. Ferrocalcite generated in late diagenetic stage filled the remained intergranular pores with a semi-basal or basal cementation, which enormously lowers the accumulation capacity of the reservoir.

Cite this article

TAN Kaijun , XU Duonian , YIN Lu , DAI Dongdong , QI Wen . Origin analysis of carbonate cements in Chang 8 reservoir in southeastern margin of Ordos Basin[J]. Lithologic Reservoirs, 2011 , 23(4) : 65 -69 . DOI: 10.3969/j.issn.1673-8926.2011.04.012

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