COMPACTING AND ACCUMULATION HISTORY OF CHANG 6-CHANG 9 RESERVOIRS FROM THE TRIASSIC YANCHANG FORMATION IN ZHIDAN OILFIELD
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摘要:
通过对志丹油田纸坊北地区长6-长9不同层段储层研究，恢复砂岩储层成岩致密化过程，建立各个层位砂岩孔隙演化规律.依据流体包裹体均一温度、荧光光谱测试分析，确定了研究区长6-长9油层组石油充注期次和时间，查明了该区油藏的成藏史.对成岩-致密-成藏的耦合关系分析结果揭示，研究区长6-长9油藏为"先致密、后成藏"的成岩-成藏特征，为下一步成藏主控因素确定及有利区预测提供理论依据.
Abstract:The diagenetic densification process of sandstone reservoir is restored and pore evolution law of sandstone in each horizon is established through the study of Chang 6-Chang 9 reservoirs in North Zhifang area of Zhidan Oilfield. The oil charging period and time of Chang 6-Chang 9 oil groups, as well as the accumulation history of oil reservoir in the area, are determined on the basis of analysis on homogenization temperature of fluid inclusions and fluorescence spectrum test. The analysis of coupling relationship between diagenesis-densification-accumulation reveals that the Chang 6-Chang 9 reservoirs are characterized by densification before the hydrocarbon accumulation, which provides a theoretical basis for determination of the main controlling factors of accumulation and prediction of favorable areas in the future.
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Key words:
- fluid inclusion /
- compacting history /
- accumulation history /
- Yanchang Formation /
- reservoir /
- Zhidan Oilfield
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表 1 纸坊北地区延长组储层分选系数及原始孔隙度恢复计算结果
Table 1. Reservoir sorting coefficient and primary porosity recovery of Yanchang Formation in North Zhifang area
层位 Trask分选系数 Φ/% 最小 最大 平均 最小 最大 平均 长6 1.2 1.7 1.6 34.5 40.9 35.6 长7 1.5 1.8 1.6 34.0 36.7 35.4 长8 1.5 1.7 1.6 34.8 36.3 35.6 长9 1.5 1.7 1.6 34.4 35.9 35.2 
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表 2 纸坊北地区不同层位压实作用和胶结作用对孔隙度的影响对比
Table 2. Effects of compaction and cementation on porosity at different horizons in North Zhifang area
层位 压实减孔率/% 胶结减孔率/% 长6 49.80 31.65 长7 54.63 31.49 长8 58.84 29.52 长9 61.64 26.87
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表 3 纸坊北地区各层位溶蚀作用对孔隙度的影响对比
Table 3. Comparison of the effect of dissolution on porosity at different horizons in North Zhifang area
层位 溶蚀增孔量/% 溶蚀增孔率/% 长6 3.47 9.76 长7 2.70 7.62 长8 2.44 6.86 长9 3.80 10.78
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表 4 纸坊北地区长6—长9油层组孔隙度变化及计算、实测值
Table 4. Porosity variation, calculated and measured values of Chang 6－Chang 9 oil reservoirs in North Zhifang area
层位 长6储层 长7储层 长8储层 长9储层 早成岩期 绿泥石充填作用 -5.5 -6.0 -2.6 -3.0 机械压实作用 -49.8 -54.6 -58.8 -61.6 硅质胶结作用 -2.4 -3.5 -2.5 -0.9 中成岩期 伊利石充填作用 -6.2 -5.5 -2.3 -3.7 碳酸盐岩胶结作用 -16.7 -15.2 -22.2 -18.7 沥青质沉积作用 -0.9 -1.4 -0.01 -0.5 溶蚀作用 +9.8 +7.6 +6.7 +10.8 裂缝影响 +0.4 +0.01 +0.4 +0.3 现今计算 10.2 7.6 6.7 8.0 现今实测 6~14
（10.1）4~12
（7.4）4~10
（6.8）2~12
（7.6）单位：%. +为增加，－为减少，括号内为平均值.
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