Characteristics of calcite cements of Chang 6 oil reservoir set in Huaqing area
Online published: 2012-04-20
The Triassic Chang 6 oil reservoir set in Huaqing area is the main hydrocarbon reservoir and producing formation of Mesozoic in Ordao Basin. The cementation of calcite cements is a major factor for the tight reservoir. The analyses on thin section, cathodoluminescence, elemental composition and carbon isotope show that most of the calcites cemented in granular and poecilitic texture, and a fewcemented in micrite texture which are the matrix of syndepositional lake facies. There are several different genetic mechanisms for the granular and poecilitic calcite cements formed during post sedimentary stages, and the calcite cements deposited during the early diagenetic A stage are in connection with the hydration of aluminumsilicateminerals, metamorphic rocks and magmatic rocks. The ferrocalcite cements filled not only in the primary pore, but also in secondary pores. The formation of ferrocalcite cements are closely related to the aluminum silicate minerals and the transformation of clay mineral and occurred during the early diagenetic B stage. Themost cementation of the calcites and ferrocalcite are disadvantageous for the reservoir properties.
JIU Kai , DING Wenlong , LI Chunyan , ZENG Weite . Characteristics of calcite cements of Chang 6 oil reservoir set in Huaqing area[J]. Lithologic Reservoirs, 2012 , 24(2) : 48 -52 . DOI: 10.3969/j.issn.1673-8926.2012.02.010
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