Reservoir diagenesis and porosity evolution of the 4th member of the Dengying Formation in northeastern Sichuan Basin

doi:10.13745/j.esf.sf.2023.2.16

Abstract

Abstract:

Based on abundant field outcrop and core data, combined with scanning electron microscopy, cathodofluerescence microscopy and geochemical analysis, carbonate diagenesis, diagenetic sequence and pore evolution in the 4^th member of the Dengying Formation in northeastern Sichuan Basin were studied in detail. Widely influenced by pore fluid and diagenetic changes during sedimentation and diagenesis, the carbonate reservoir underwent submarine cementation, syngenetic-parasyngenetic atmospheric freshwater dissolution, karstification controlled by sedimentary facies in the eogenetic stage, cement filling under shallow burial, dissolution under mid-deep burial, recrystallization and tectonic rupturing. Due to complex diagenetic fluids, the main cement fillings featured five periods of dolomite cements and two periods of siliceous cements related to volcano-hydrothermal activity, and the damage to the reservoir was most serious. However, facies-controlled eogenetic karstification was obviously different from typical epigenic karstification, and was the most critical, constructive diagenesis impacting the reservoir development in the study area. And dynamic superposition of different diagenesis eventually resulted in the current reservoir features. Results from this study provided a geological basis for the discovery of high-quality reservoirs in the region.

Key words: diagenesis, diagenetic sequence, pore evolution, karstification controlled by sedimentary facies, 4^th member of the Dengying Formation, northeastern Sichuan Basin

CLC Number:

LI Bisong, JIN Mindong, ZHU Xiang, DAI Lincheng, YANG Yi. Reservoir diagenesis and porosity evolution of the 4^th member of the Dengying Formation in northeastern Sichuan Basin[J]. Earth Science Frontiers, 2023, 30(6): 32-44.

Figures/Tables 12

Fig.1 Location of the study area, structure, wells and Stratigraphic characteristics sketches. Modified after [6].

Fig.2 Depositional sequence composite columnar section of the fourth member of Dengying Formation in Hujiaba.

Fig.3 Diagenetic environments and diagenesis of the 4th Member of Dengying Formation in the Northeastern Sichuan Basin

Fig.4 Identification marks of the compaction, pressure solution and dolomite cement of the 4th Member of Dengying Formation in the Northeastern Sichuan Basin

Table 1 The results of electron microprobe analyses of atmospheric freshwater dolomite and matrix dolomite

白云石类型	井号/剖面	岩性	取样位置	微量组分质量分数/%
白云石类型	井号/剖面	岩性	取样位置	Na₂O	K₂O	SrO	BaO	FeO	MnO
大气淡水白云石	南江杨坝剖面	凝块云岩	第37层	0.000	0.000	0.000	0.000	0.033	0.020
		凝块云岩	第37层	0.000	0.000	0.000	0.025	0.040	0.023
		凝块云岩	第96层	0.000	0.008	0.000	0.000	0.192	0.047
基质白云石	南江杨坝	砂屑云岩	第321层	0.006 4	0.008	0.029	0.000	0.000	0.015
基质白云石	高石1	凝块云岩	4 957.76 m	0.088	0.034	0.027	0.000	0.004	0.019

Fig.5 Identification marks of the siliceous cement of the 4th Member of Dengying Formation in the Northeastern Sichuan Basin

Fig.6 Identification marks of paste pore, intragranular dissolved pore and moldic pore of the 4th Member of Dengying Formation in the Northeastern Sichuan Basin

Fig.7 The feature of karstification controlled by sedimentary facies in the eogenetic period of the 4th Member of Dengying Formation in the Northeastern Sichuan Basin

Fig.8 Porosity distributionhistogram of different sedimentary facies belts of the 4th member of Dengying Formation in the Northeastern Sichuan Basin

Fig.9 Recrystallization and tectonic rupturing of the 4th Member of Dengying Formation in the Northeastern Sichuan Basin

Fig.10 The evolution history of reservoir pore of the 4th Member of Dengying Formation in the Northeastern Sichuan Basin

Fig.11 The evolution model map of the reservoir pore of the 4th Member of Dengying Formation in the Northeastern Sichuan Basin

References 35

[1]	陈文正. 再论四川盆地威远震旦系气藏的气源[J]. 天然气工业, 1992, 12(6): 28-32, 7.
[2]	邹才能, 杜金虎, 徐春春, 等. 四川盆地震旦系-寒武系特大型气田形成分布、资源潜力及勘探发现[J]. 石油勘探与开发, 2014, 41(3): 278-293.
[3]	罗冰, 杨跃明, 罗文军, 等. 川中古隆起灯影组储层发育控制因素及展布[J]. 石油学报, 2015, 36(4): 416-426. DOI
[4]	文龙, 王文之, 张健, 等. 川中高石梯-磨溪地区震旦系灯影组碳酸盐岩岩石类型及分布规律[J]. 岩石学报, 2017, 33(4): 1285-1294.
[5]	金民东, 谭秀成, 童明胜, 等. 四川盆地高石梯-磨溪地区灯四段岩溶古地貌恢复及地质意义[J]. 石油勘探与开发, 2017, 44(1): 58-68. DOI
[6]	金民东, 李毕松, 朱祥, 等. 四川盆地东北部元坝地区及周缘震旦系灯影组四段储集层特征及主控因素[J]. 石油勘探与开发, 2020, 47(6): 1090-1099. DOI
[7]	莫静, 王兴志, 谢林, 等. 川中震旦系灯影组碳酸盐岩成岩作用及储层孔隙演化[J]. 石油天然气学报, 2013, 35(8): 32-38, 5.
[8]	强深涛, 沈平, 张健, 等. 四川盆地川中地区震旦系灯影组碳酸盐沉积物成岩作用与孔隙流体演化[J]. 沉积学报, 2017, 35(4): 797-811.
[9]	张娣, 李嵘, 杨平, 等. 雪峰山西侧地区下古生界海相白云岩储层的成岩作用[J]. 地质通报, 2012, 31(11): 1862-1871.
[10]	刘树根, 黄文明, 张长俊, 等. 四川盆地白云岩成因的研究现状及存在问题[J]. 岩性油气藏, 2008, 20(2): 6-15.
[11]	朱东亚, 金之钧, 张荣强, 等. 震旦系灯影组白云岩多级次岩溶储层叠合发育特征及机制[J]. 地学前缘, 2014, 21(6): 335-345. DOI
[12]	蒋裕强, 陶艳忠, 谷一凡, 等. 四川盆地高石梯-磨溪地区灯影组热液白云石化作用[J]. 石油勘探与开发, 2016, 43(1): 51-60. DOI
[13]	金民东, 谭秀成, 李毕松, 等. 四川盆地震旦系灯影组白云岩成因[J]. 沉积学报, 2019, 37(3): 443-454.
[14]	宋金民, 刘树根, 孙玮, 等. 兴凯地裂运动对四川盆地灯影组优质储层的控制作用[J]. 成都理工大学学报(自然科学版), 2013, 40(6): 658-670.
[15]	单秀琴, 张静, 张宝民, 等. 四川盆地震旦系灯影组白云岩岩溶储层特征及溶蚀作用证据[J]. 石油学报, 2016, 37(1): 17-29. DOI
[16]	赵东方, 谭秀成, 罗文军, 等. 早成岩期岩溶特征及其对古老深层碳酸盐岩储层的成因启示: 以川中地区磨溪8井区灯影组四段为例[J]. 石油学报, 2022, 43(9): 1236-1252. DOI
[17]	何治亮, 张军涛, 丁茜, 等. 深层-超深层优质碳酸盐岩储层形成控制因素[J]. 石油与天然气地质, 2017, 38(4): 633-644, 763.
[18]	JOHNSON C L, RITTS B D. Plate interior poly-phase basins[M]//Tectonics of sedimentary basins. Chichester: John Wiley and Sons, Ltd, 2012: 565-582.
[19]	郭正吾, 邓康龄, 韩永辉, 等. 四川盆地形成与演化[M]. 北京: 地质出版社, 1996.
[20]	汪泽成, 姜华, 王铜山, 等. 四川盆地桐湾期古地貌特征及成藏意义[J]. 石油勘探与开发, 2014, 41(3): 305-312.
[21]	谢武仁, 姜华, 马石玉, 等. 四川盆地德阳—安岳裂陷晚震旦世—早寒武世沉积演化特征与有利勘探方向[J]. 天然气地球科学, 2022, 33(8): 1240-1250.
[22]	李凌, 谭秀成, 曾伟, 等. 四川盆地震旦系灯影组灰泥丘发育特征及储集意义[J]. 石油勘探与开发, 2013, 40(6): 666-673.
[23]	段金宝, 代林呈, 李毕松, 等. 四川盆地北部上震旦统灯影组四段储层特征及其控制因素[J]. 天然气工业, 2019, 39(7): 9-20.
[24]	杨雨, 黄先平, 张健, 等. 四川盆地寒武系沉积前震旦系顶界岩溶地貌特征及其地质意义[J]. 天然气工业, 2014, 34(3): 38-43.
[25]	朱筱敏. 沉积岩石学[M]. 4版. 北京: 石油工业出版社, 2008.
[26]	钱一雄, 冯菊芳, 何治亮, 等. 从岩石学及微区同位素探讨四川盆地灯影组皮壳-葡萄状白云石成因[J]. 石油与天然气地质, 2017, 38(4): 665-676.
[27]	周进高, 张建勇, 邓红婴, 等. 四川盆地震旦系灯影组岩相古地理与沉积模式[J]. 天然气工业, 2017, 37(1): 24-31.
[28]	四川省地质局. 四川省区域地质调查报告: 城口幅-巫溪幅H-49-Ⅰ[R]. 成都: 四川省地质局, 1977.
[29]	冯明友, 强子同, 沈平, 等. 四川盆地高石梯-磨溪地区震旦系灯影组热液白云岩证据[J]. 石油学报, 2016, 37(5): 587-598. DOI
[30]	王国芝, 赵甫峰, 付于真, 等. 四川盆地北缘灯影组中MVT铅锌矿成矿时代的确定[J]. 矿物学报, 2015, 35(增刊1): 723.
[31]	谭秀成, 肖笛, 陈景山, 等. 早成岩期喀斯特化研究新进展及意义[J]. 古地理学报, 2015, 17(4): 441-456.
[32]	BACETA J I, WRIGHT V P, BEAVINGTON-PENNEY S J, et al. Palaeohydrogeological control of palaeokarst macro-porosity genesis during a major sea-level lowstand: Danian of the Urbasa-Andia Plateau, Navarra, North Spain[J]. Sedimentary Geology, 2007, 199(3/4): 141-169. DOI URL
[33]	朱东亚, 张殿伟, 张荣强, 等. 中国南方地区灯影组白云岩储层流体溶蚀改造机制[J]. 石油学报, 2015, 36(10): 1188-1198. DOI
[34]	ROBIN G C B. Cabonate sediments and their diagenesis[M]. Amsterdam: Elsevier Publishing Company, 1971.
[35]	翟永红, 郭成贤. 中扬子台地北缘灯影组碳酸盐岩成岩作用序列及成岩模式[J]. 地质地球化学, 1997(2): 45-52.