Formation Mechanism and Geological Significance of Carbonate Cements in Baikouquan Formation on Northern Slope of Mahu Sag

doi:10.7657/XJPG20220507

Abstract

Abstract:

In order to further investigate the diagenetic environment, formation mechanism of carbonate cements and its influences on the physical properties of the sandy conglomerate reservoirs in the Lower Triassic Baikouquan formation on the northern slope of the Mahu sag, Junggar basin, the types, forming periods, and genesis of the carbonate cements in the study area and their effects on the reservoirs were studied through combining core observation, rock thin section identification and measurement of carbon and oxygen isotopes in carbonate cements. The results show that there are three periods of carbonate cements in the Baikouquan formation on the northern slope of the Mahu sag, that is, from early to late, micritic calcite in Period Ⅰ, ferrocalcite in Period Ⅱ, and ankerite in Period Ⅲ. δ¹³C_PDB ranges from -47.23‰ to 3.88‰, while δ¹⁸O_PDB ranges from -23.64‰ to -17.98‰. The bigger range of δ¹³C_PDB reveals the presence of various carbon sources and the complex interaction between water and rock. The paleosalinity and paleotemperature restored from the carbon and oxygen isotope calculations show that the carbonate cements were mainly formed in freshwater environments, and partly influenced by seawater. The Baikouquan formation in Well Ma-19 is a low-porosity and low-permeability reservoir as a whole. The physical properties of the Bai 2 member are slightly better than those of the Bai 3 member, presumably indicating the presence of secondary pores. Post-drilling analysis finds that oil layers are developed in both Bai 2 member and Bai 3 member, which is basically consistent with the conclusion obtained from carbon and oxygen isotope analysis.

Key words: Junggar basin, Mahu sag, northern slope, Baikouquan formation, carbonate cement, formation mechanism, diagenesis

CLC Number:

TE112.221

LYU Huanze, ZOU Niuniu, CAI Ningning, HUANG Yongzhi, NING Shitan, ZHU Biao. Formation Mechanism and Geological Significance of Carbonate Cements in Baikouquan Formation on Northern Slope of Mahu Sag[J]. Xinjiang Petroleum Geology, 2022, 43(5): 554-562.

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