Characteristics and Significance of Carbonate Cement in the No. 7 Area of Lenghu, Northern Margin of Qaidam Basin

doi:10.11885/j.issn.1674-5086.2018.09.12.01

Abstract

Abstract: Carbonate cement is the most common type of cement in clastic reservoirs, and its formation environment, material source and diagenetic temperature are of great significance to the reservoir research. Through the analysis of petrology, mineralogy and geochemical of the sandstone carbonate cementation in the Xiaganchaigou Formation of Lenghu No.7 in the northern margin of Qaidam Basin, this paper shows that there are four types of sandstone carbonate cements in the Xiaganchaigou Formation in the study area which are calcite, iron-bearing calcite, iron calcite and dolomite respectively. The content of carbon isotopes (δ¹³C_PDB) and oxygen isotopes (δ¹⁸O_PDB) are 8.81‰~3.51‰ and 8.77‰~17.36‰ respectively, with averages value of 5.33‰ and 13.50‰, respectively. Paleosalinity and temperature are 113.61~102.85 and 63.03~123.06℃ according to carbon isotopes and oxygen isotopes calculation, the average value is 109.66 and 94.47℃, respectively. It reflects that the diagenetic stage of the Xiaganchaigou Formation is from early diagenetic stage B to middle diagenetic stage A, whose formation process is influenced by the decarboxylation of organic matter. The diagenetic environment is acidic, and the diagenetic fluids mainly come from the precipitated water of the clastic and the leaching fresh water in the atmosphere. Besides the influence of diagenetic environment and temperature, the physical property of reservoir has a significant negative correlation with the carbonate cement content. And with the increase of carbonate cement content, the porosity and permeability of the reservoir decrease.

Key words: carbonate cements, isotopes, Xiaganchaigou Formation, Lenghu No. 7 Area, reservoir physical properties

CLC Number:

TE122

WANG Yetong, SUN Guoqiang, YANG Yongheng, QIN Caihong, LI Yanming. Characteristics and Significance of Carbonate Cement in the No. 7 Area of Lenghu, Northern Margin of Qaidam Basin[J]. 西南石油大学学报(自然科学版), 2020, 42(1): 45-56.

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