The evolution of diagenesis influenced by different provenance in the Eastern Depression of the North Yellow Sea Basin
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摘要:
以北黄海盆地东部坳陷中生界碎屑岩储层为研究对象，运用岩石薄片光学显微鉴定、阴极发光和扫描电镜等技术方法和手段分析成岩特征，探讨不同物源-沉积体系控制下储层的成岩演化。研究认为，东部坳陷中生界储层主要处于中成岩阶段A期，发育的主要成岩作用类型为压实作用、胶结作用、凝灰质脱玻化作用、交代作用、蚀变作用和溶蚀-溶解作用，其中，东部地区压实作用强度要高于西南和北部地区，北部地区碳酸盐胶结物的含量明显高于其他地区，东部地区以凝灰质胶结为特征并发生凝灰质脱玻化作用，西南部以黏土矿质胶结为特征并发生明显的黏土矿物转化现象，西南和北部地区的溶蚀/溶解作用的发育程度要好于东部地区。综合分析认为，研究区不同物源沉积区储层具有差异的成岩特征，表现为不同的储层序列，从而影响储层的成岩演化。
Abstract:To understand the diagenetic evolution of the reservoir that is controlled by different provenance- sedimentary systems, the clastic reservoir of the Mesozoic deposits in the Eastern Depression of the North Yellow Sea Basin was anatomized. Methods of thin section identification, cathodoluminescence, and scanning electron microscope were used. Results shows that the Mesozoic reservoir in the depression is largely in the stage A of mesodiagenesis, and the main diagenesis types include compaction, cementation, replacement/alteration, and tuffaceous devitrification/dissolution. The level of compaction in the eastern region is higher than that in the southwest and northern regions. The content of carbonate cement in the northern region is much higher than that in other regions. The eastern region is characterized by tuffaceous cementation and tuffaceous devitrification; and the southwest is characterized by clay mineral cementation and obvious clay mineral transformation. The development degree of dissolution in the southwest and northern regions is higher than that in the eastern region. Comprehensive analysis shows that the reservoirs in different provenance sedimentary areas in the study area have different diagenetic characteristics and show different reservoir sequences, which affected the diagenetic evolution of the reservoirs.
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Key words:
- North Yellow Sea Basin /
- Mesozoic /
- reservoir /
- provenance /
- evolution of diagenesis
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表 1 北黄海盆地东部坳陷中生界砂岩样品的岩屑百分含量
Table 1. Percentages of rock fragments in the Mesozoic sandstone samples in the Eastern Depression, North Yellow Sea Basin
/% 井 层
位深度/m 花岗岩屑 流纹岩屑 凝灰岩屑 安山岩屑 砂岩岩屑 灰岩岩屑 最小 最大 最小 最大 最小 最大 最小 最大 最小 最大 最小 最大 B9 J3—K1 3 003.84～3 360.2 38.05 90.14 0 25.9 0 25 0 36.34 B6 J3-—K1 2 961.53～3 477.59 12.85 92.87 0 15.7 4 19.64 0 7.12 B3 J3—K1 2 343.05～3 094.9 6.14 66.89 31.78 65.19 0 17.39 0 42.62 B2 J3—K1 2 293.16～2 952.05 10 58.82 15.38 61.11 6.25 61.54 0 21.87 B4 J3—K1 1 329.6～3 133.53 35.72 74.34 12.12 48.1 3.15 34.5 0 8.2 0 3.68 B5 J3 3 170.23～3 361.57 68.97 84.53 0 20.11 0.65 31 0 14.65 0.27 4.66 D8 K1 3 684.64～3 693.8 3.67 4.69 52.22 65.03 31.29 35.96 0 7.33 D7 J3 1 821.2～2 155.29 0.71 33.73 15.99 38.99 14.23 41.02 12.47 33.69 4.25 10.99 
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表 2 北黄海盆地东部坳陷中生界成岩作用特征
Table 2. Diagenesis characteristics of the Mesozoic strata in the Eastern Depression, North Yellow Sea Basin
成岩作用程度 西南部 北部 东部 压实作用 中等 中等 强 胶结作用类型 黏土质胶结 黏土质胶结+碳酸盐胶结 凝灰质胶结 凝灰质脱玻化 弱 弱 中等 交代作用 中 强 弱 蚀变作用 强 中 强 溶蚀/溶解作用 强 强 中
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表 3 北黄海盆地东部坳陷中生界不同物源沉积区成岩作用序列表
Table 3. The diagenesis sequence of the Mesozoic deposits in different areas of provenances in the Eastern Depression, the North Yellow Sea Basin
沉积区 成岩序列 西南物源沉积区 压实作用-黏土质胶结作用-黏土矿物转化-硅质胶结-溶蚀/溶解作用 北部物源沉积区 压实作用-碳酸盐胶结作用-交代蚀变作用-重结晶作用-溶蚀/溶解作用 东部物源沉积区 压实作用-凝灰质胶结作用-蚀变作用-脱玻化重结晶作用-溶蚀/溶解作用
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表 4 北黄海盆地东部坳陷中生界不同物源沉积区微相占比
Table 4. Percentage of microfacies in sedimentary areas of Different Provenances of Mesozoic in the Eastern Depression, North Yellow Sea Basin
/% 水下河道 河口坝 远砂坝 水下扇 西南沉积体系 23.8 54.3 11.3 10.7 北部沉积体系 14.1 35.1 17.5 33.3 东部沉积体系 4.5 6.7 12.9 75.9
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