玛湖凹陷北斜坡百口泉组碳酸盐胶结物形成机理及其地质意义

doi:10.7657/XJPG20220507

摘要/Abstract

摘要：

为进一步探讨准噶尔盆地玛湖凹陷北斜坡下三叠统百口泉组砂砾岩储集层的成岩环境、碳酸盐胶结物形成机理及对储集层物性的影响,综合运用岩心观察、岩石薄片鉴定及碳酸盐胶结物碳氧同位素测定,对研究区碳酸盐胶结物的类型、形成期次、成因及其对储集层的影响进行研究。结果表明,玛湖凹陷北斜坡百口泉组存在3期碳酸盐胶结物,从早到晚依次为Ⅰ期泥晶方解石、Ⅱ期铁方解石和Ⅲ期铁白云石;δ¹³C_PDB为-47.23‰~3.88‰,δ¹⁸O_PDB为-23.64‰~-17.98‰,δ¹³C_PDB范围较大,揭示有多种渠道提供碳源及水岩相互作用复杂;通过碳氧同位素计算恢复的古盐度和古温度显示,碳酸盐胶结物主要形成于淡水环境中,部分受海水影响。玛19井百口泉组整体为低孔低渗储集层,百二段物性略好于百三段,推测有次生孔隙发育;钻井后分析发现,玛19井百二段和百三段均有油层发育,与碳氧同位素分析得出的结论基本一致。

关键词: 准噶尔盆地, 玛湖凹陷, 北斜坡, 百口泉组, 碳酸盐胶结物, 形成机理, 成岩作用

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

中图分类号:

TE112.221

吕焕泽, 邹妞妞, 蔡宁宁, 黄永志, 宁诗坦, 朱彪. 玛湖凹陷北斜坡百口泉组碳酸盐胶结物形成机理及其地质意义[J]. 新疆石油地质, 2022, 43(5): 554-562.

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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