DEVELOPMENTAL FEATURES AND THE RELATIONSHIP BETWEEN FRACTURES AND GAS ACCUMULATION IN THE XUJIAHE FORMATION OF GUANG'AN GASFIELD, THE SICHUAN BASIN
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摘要: 裂缝在四川盆地须家河组致密砂岩气田的形成过程中起到重要的作用.裂缝的发育特征与力学形成过程决定了其与致密砂岩有效储层的形成和天然气运聚之间的关系.围绕该问题,通过岩心观察与成像测井分析,研究了广安地区须家河组须六与须四段储层裂缝的发育特征.根据构造背景和区域应力场的研究,发现该区主要有两期构造裂缝,分别为燕山晚期褶皱伴生张裂缝与喜山期断层伴生剪裂缝.第1期裂缝的形成与烃源岩的大量生排烃时间相吻合,促进了该区有效储层的形成,同时也是天然气运聚成藏的通道,如广安5井区;第2期裂缝形成时间晚,储层已经致密化,裂缝必须与有效储层相结合,才能对气藏起到调整与定型的作用,如广安124井区.Abstract: The fractures have a great effect on gas migration and accumulation in compacted sandstone of Xujiahe Formation,the Sichuan Basin.Developmental features and mechanical formation process of fractures determined the relationship of effective reservoirs and gas accumulation in compacted sandstone.Based on it,the fractures in sandstone reservoirs of T3x4 and T3x6 in the Sichuan Basin are discusseded according to core observation and imaging logging analysis.According to researches of fractures character and regional stress fields indicated that there are two stages of fractures formation,which are tension fractures associated with folds in the late Yanshanian period,and shear ones associated with faults in the Himalayan period.In Well GAN5 area of T3x4,the first stage of fractures is formed at the same time with peak hydrocarbon-generation period,therefore,the fractures can be favorable to the forming of effective reservoirs and the gas migration.However,in Well GAN124 area,the fractures are formed after the effective reservoirs occurrence,so the fractures must be combinated with the effective reservoirs,and can adjust and reshape the gas reservoir which have already been formed.
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Key words:
- structural fracture /
- forming period /
- gas accumulation /
- Guang’an Gasfield /
- Xujiahe Formation /
- the Sichuan Basin
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[1] 翟光明.中国石油地质志(卷十)[M].北京:石油工业出版社,1989 [2] 侯方浩,蒋裕强,方少仙等.四川盆地上三叠统香溪组二段和四段砂岩沉积模式[J].石油学报,2005,26(2):30～37 [3] 杨晓萍,赵文智,邹才能等.川中气田与苏里格气田"甜点"储层对比研究[J].天然气工业,2007,27(1):4～7 [4] 王洪辉,陆正元.四川盆地上三叠统砂岩非构造裂缝储层[J].石油与天然气地质,1998,19(1):35～41 [5] 蒋裕强,郭贵安,陈辉等.川中地区上三叠统须家河组二段和四段砂岩优质储层成因探讨[J].油气地质与采收率,2007,14(1):18～22 [6] Nelson R A.天然裂缝储集层地质分析[M].柳广第译.北京:石油工业出版社,1991.142～157 [7] 曾联波,李跃刚,王正国等.邛西构造须二段特低渗透砂岩储层微观裂缝的分布特征[J].天然气工业,2007,27(6):45～47 [8] 于红枫,王英民,周文.川西坳陷松华镇-白马庙地区须二段储层裂缝特征及控制因素[J].中国石油大学学报(自然科学版),2006,30(3):17～22 [9] 周新桂,张林炎,范昆.含油气盆地低渗透储层构造裂缝定量预测方法和实例[J].天然气地球科学,2007,18(3):328～333 [10] Lorenz J C,Sterling J L,Schechter D S,et al.Natural fractures in the Spraberry Formation,Midland basin,Texas:The effects of mechanical stratigraphy on fracture variability and reservoir behavior[J].AAPG Bulletin,2002,86(3):505～524 [11] 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 [12] 邓康龄.四川盆地形成演化与油气勘探领域[J].天然气工业,1996,12(5):7～13 [13] 单业华,葛维萍.储层天然裂缝形成机制的初步研究:以静北潜山油藏为例[J].石油实验地质,2001,23(4):457～463 [14] 余鸿年,卢华复.构造地质学原理[M].南京:南京大学出版社,1998 [15] 周文.裂缝性油气储集层评价方法[M].成都:四川科技出版社,1998.25～128 [16] Laubach S E.A method to detect natural fracture strike in sandstones[J].AAPG Bulletin,1997,81(4):604～623 [17] 杨晓萍,邹才能,李伟.四川盆地中部上三叠统香溪群岩性油气藏圈闭类型及其特征[J].中国石油勘探,2006,11(4):33～36 [18] 陈义才,蒋裕强,郭贵安等.川中地区上三叠统天然气成藏机理[J].天然气工业,2007,27(6):27～30 [19] 车国琼,龚昌明,汪楠等.广安地区须家河组气藏成藏条件[J].天然气工业,2007,27(6):1～5 [20] 李宗银,李耀华,王翎人.川中-川西地区上三叠统天然气成藏主控因素[J].天然气勘探与开发,2005,28(1):5～7 -
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