Genesis of Carbonate Cement and Influence on Reservoir Quality of the Badaowan Formation in AH5 Well Block of Junggar Basin

doi:10.19657/j.geoscience.1000-8527.2023.035

Abstract

Abstract:

To deeply investigate the genesis of carbonate cement in reservoirs of Jurassic Badaowan Formation in AH5 well block of the Junggar Basin, and to discuss the influence on the reservoir physical property and oiliness for evaluating/predicting reservoirs in later period, we studied the types, forming period, genesis and the influence on reservoir quality through combining thin-section petrography and carbon-oxygen isotope analyses in carbonate cement.The results show at least two periods of carbonate cement in the Badaowan Formation: micritic siderite and crystalline calcite in the early diagenetic stage (limited distribution), and granular siderite, ferrocalcite and ankerite developed in the late diagenetic stage (secondary dissolution pore infill), and ankerite has the highest volume.δ¹³C_PDB of carbonate cement=-13.6‰ to -6.5‰, and δ¹⁸O_PDB=-21‰ to -18.1‰.The paleosalinity and paleotemperature estimated from the carbon-oxygen isotope compositions show that the carbonate cement was formed in freshwater environment at 112 to 136.1 ℃, based on that the forming time was the middle diagenetic period.The carbon source in carbonate cement was of organic origin through carbon diagram and analysis on natural gas isotopes.Reservoirs with carbonate cement have always bad physical property, and reservoirs with ankerite cement have better physical property through combining physical property, fluorescence thin-section and carbonate cement content analysis.The higher volume of ankerite would have more early secondary dissolved pores and better reservoir oiliness.

Key words: carbonate cement, formation mechanism, Badaowan Formation, AH5 well block, Junggar Basin

CLC Number:

P618.13

YU Jingwei, DING Wei, ZHANG Xin, QI Liqi, HUANG Shuya, ZHANG Zhiyue, ZHANG Yile. Genesis of Carbonate Cement and Influence on Reservoir Quality of the Badaowan Formation in AH5 Well Block of Junggar Basin[J]. Geoscience, 2023, 37(05): 1336-1344.

Figures/Tables 8

Fig.1 Structural map of the Junggar Basin (a), structural location of the study area (b) and stratigraphic column of well AH5 (c)[7]

Fig.2 Petrological characteristics of reservoirs in Badaowan Formation in the study area

Fig.3 Thin-section photomicrographs of carbonate cement in Badaowan Formation in the study area

Table 1 Carbon and oxygen isotope compositions of carbonate cement in Badaowan Formation of the study area

样品号	碳酸盐胶结物类型	δ¹³C_PDB (‰)	δ¹⁸O_PDB (‰)	δ¹⁸O_SMOW (‰)	Z值	矿物形成温度 (℃)
AH501-1	团粒状菱铁矿	-10.30	-18.10	12.20	97.19	112.04
M625-1	团粒状菱铁矿	-11.20	-18.40	11.89	95.20	114.45
M625-2	铁方解石	-10.10	-19.50	10.76	96.90	123.44
M625-3	铁方解石	-11.20	-18.50	11.79	95.15	115.26
AH501-2	铁白云石	-13.60	-21.00	9.21	88.99	136.08
AH501-3	铁白云石	-10.30	-19.00	11.27	96.74	119.32
AH501-4	铁白云石	-7.50	-19.60	10.66	102.18	124.26
AH501-5	铁白云石	-10.60	-19.40	10.86	95.93	122.61
AH501-6	铁白云石	-10.10	-19.90	10.35	96.71	126.76
AH501-7	铁白云石	-6.50	-19.30	10.96	104.38	121.78

Fig.4 Genetic discrimination plots of carbonate cement in Badaowan Formation of the study area

Fig.5 Buried history and diagenetic evolution of Badaowan Formation in the study area(AH5)

Fig.6 Vertical distribution of carbonate cement in Badaowan Formation of the study area

Fig.7 Relationship between carbonate cement and reservoir oiliness in Badaowan Formation of the study area

References 28

[1]	朱国华. 碎屑岩储集层孔隙的形成、演化和预测[J]. 沉积学报, 1992, 10(3): 114-123.
[2]	钟大康, 朱筱敏, 李树静, 等. 早期碳酸盐胶结作用对砂岩孔隙演化的影响: 以塔里木盆地满加尔凹陷志留系砂岩为例[J]. 沉积学报, 2007, 25(6): 885-890.
[3]	孙致学, 孙治雷, 鲁洪江, 等. 砂岩储集层中碳酸盐胶结物特征: 以鄂尔多斯盆地中南部延长组为例[J]. 石油勘探与开发, 2010, 37(5): 543-551.
[4]	朱筱敏, 米立军, 钟大康, 等. 济阳坳陷古近系成岩作用及其对储层质量的影响[J]. 古地理学报, 2006, 8(3): 295-305.
[5]	陈强路, 钱一雄, 马红强, 等. 塔里木盆地塔河油田奥陶系碳酸盐岩成岩作用与孔隙演化[J]. 石油实验地质, 2003, 25(6): 729-734.
[6]	于景维, 郑荣才, 殷新花, 等. 准噶尔盆地阜东斜坡区头屯河组储集层非均质性综合研究[J]. 成都理工大学学报(自然科学版), 2014, 41(5): 567-576.
[7]	刘文锋, 张小栓, 刘谨铭, 等. AH5井区八道湾组砂质和砾质储层孔隙结构特征及评价[J]. 现代地质, 2021, 35(6): 1844-1853.
[8]	王小军, 宋永, 郑孟林, 等. 准噶尔西部陆内盆地构造演化与油气聚集[J]. 地学前缘, 2022, 29(6): 188-205. DOI
[9]	唐勇, 宋永, 何文军, 等. 准噶尔叠合盆地复式油气成藏规律[J]. 石油与天然气地质, 2022, 43(1): 132-148.
[10]	何登发, 陈新发, 张义杰, 等. 准噶尔盆地油气富集规律[J]. 石油学报, 2004, 25(3): 1-10. DOI
[11]	于景维, 罗刚, 李斌, 等. 沙湾凹陷上乌尔禾组储层成岩作用及成岩相分析[J]. 现代地质, 2022, 36(4): 1095-1104.
[12]	于景维, 高立新, 卢炳雄, 等. 准噶尔盆地阜东斜坡区头屯河组二段储集层质量评价及差异性分析[J]. 地质科学, 2022, 57(3): 687-703.
[13]	单祥, 窦洋, 晏奇, 等. 玛南斜坡区风城组致密油藏储集层特征及控制因素[J]. 新疆石油地质, 2022, 43(6): 704-713.
[14]	吴海光, 康逊, 秦明阳, 等. 准噶尔盆地玛湖凹陷百口泉组砂砾岩非均质储层孔隙结构特征与成因[J]. 中南大学学报(自然科学版), 2022, 53(9): 3337-3353.
[15]	匡立春, 唐勇, 雷德文, 等. 准噶尔盆地玛湖凹陷斜坡区三叠系百口泉组扇控大面积岩性油藏勘探实践[J]. 中国石油勘探, 2014, 19(6): 14-23.
[16]	唐勇, 郭文建, 王霞田, 等. 玛湖凹陷砾岩大油区勘探新突破及启示[J]. 新疆石油地质, 2019, 40(2): 127-137.
[17]	颜玉贵. 克—乌断裂形成机制与油气聚集[J]. 新疆石油地质, 1983, 4(4): 15-19.
[18]	何登发, 尹成, 杜社宽, 等. 前陆冲断带构造分段特征: 以准噶尔盆地西北缘断裂构造带为例[J]. 地学前缘, 2004, 11(3): 91-101.
[19]	蔡观强, 郭锋, 刘显太, 等. 东营凹陷沙河街组沉积岩碳氧同位素组成的古环境记录[J]. 地球与环境, 2009, 37(4): 347-354.
[20]	邵龙义, 张鹏飞. 桂中合山组碳酸盐岩的氧、碳稳定同位素组成及古盐度和古温度[J]. 中国煤田地质, 1991, 3(1): 21-26.
[21]	肖晓光, 秦兰芝, 张武, 等. 西湖凹陷平湖组碳酸盐胶结物形成机制及其对储层的影响[J]. 地质科学, 2021, 56(4): 1062-1076.
[22]	KEITH M L, WEBER J N. Carbon and oxygen isotopic composition of selected limestones and fossils[J]. Geochimica et Cosmochimica Acta, 1964, 28(10/11): 1787-1816. DOI URL
[23]	FRIEDMANI, O'NEIL J R. Compilation of stable isotope fraction factors of geochemical interest[M]//FLEISCHER M. Data of Geochemistry (six-edition). Washington: Geological Survey, 1977:440-1212.
[24]	付锁堂, 王震亮, 张永庶, 等. 柴北缘西段鄂博梁构造带储层碳酸盐胶结物成因及其油气地质意义: 来自碳、氧同位素的约束[J]. 沉积学报, 2015, 33(5): 991-999.
[25]	谢玉洪, 黄保家. 南海莺歌海盆地东方13-1高温高压气田特征与成藏机理[J]. 中国科学(地球科学), 2014, 44(8): 1731-1739.
[26]	FRANKS S G, DIAS R F, FREEMAN K H, et al. Carbon isotopic composition of organic acids in oil field waters, San Joaquin Basin, California, USA[J]. Geochimica et Cosmochimica Acta, 2001, 65(8): 1301-1310. DOI URL
[27]	朱国华, 章卫平. 煤系地层砂岩成岩作用和孔隙演化研究: 以长广地区龙潭组为例[J]. 石油勘探与开发, 1993, 20(1): 39-47, 118.
[28]	蔡杰兴. 方解石、白云石、菱铁矿分别与含CO₂水溶液反应平衡时的温度和压力[J]. 矿物岩石, 1993, 13(2): 37-41.