川中雷口坡组四~3亚段地震相分析——应用波形分类技术研究沉积相的实例
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摘要
在工区面积大、钻井少的情况下开展地震相研究,可以有效绘出沉积相展布图。对四川盆地中部雷口坡组四3亚段利用GS1和YS104两口井进行地震地质标定,建立了膏盐湖、白云岩坪及颗粒滩等几种不同沉积微相的地震响应模式。膏盐湖相表现为强振幅、高连续的地震响应,而颗粒滩及白云岩坪主要表现为中振幅、低连续的地震响应特征。在地质标定基础上,对全区利用波形分类技术开展地震相研究,恢复了古沉积环境,获得了颗粒滩相及白云岩坪的展布图,这些分布区是有利储层的发育区。龙岗—营山—南充—蓬溪一带处于颗粒滩、白云岩坪有利相带,且处于雷四3亚段地层剥蚀线附近,受岩溶改造强烈,储层较为发育,是川中地区的重要勘探对象。
Distribution maps of sedimentary facies can be obtained by studying seismic facies in a large research area where a few wells were drilled.Through seismic and geological demarcation to two typical wells,Well GS-1 and Well YS-104,in central Sichuan Basin,the seismic response models are established for different sedimentary facies in Middle Triassic Leikoupo43 Submember,such as gypsum lagoon,dolomite tidal flat and grainstone shoal facies.On the base of geological demarcation,waveform classification technology are utilized to divide different seismic facies to restore the sedimentary paleo-environment and the distribution maps of grainstone shoal and dolostone tidal flat facies are delineated,which are just the areas of favorable reservoirs.The study result shows that the area from Longgang,Yingshan,Nanchong to Pengxi is located in the favorable sedimentary zones of grainstone shoal and dolostone tidal flat facies where reservoirs are developing since they were affected by karstification near Leikoupo 43 Submember denudation border so that they should be the important area of exploration target in central Sichuan Basin.
Distribution maps of sedimentary facies can be obtained by studying seismic facies in a large research area where a few wells were drilled.Through seismic and geological demarcation to two typical wells,Well GS-1 and Well YS-104,in central Sichuan Basin,the seismic response models are established for different sedimentary facies in Middle Triassic Leikoupo43 Submember,such as gypsum lagoon,dolomite tidal flat and grainstone shoal facies.On the base of geological demarcation,waveform classification technology are utilized to divide different seismic facies to restore the sedimentary paleo-environment and the distribution maps of grainstone shoal and dolostone tidal flat facies are delineated,which are just the areas of favorable reservoirs.The study result shows that the area from Longgang,Yingshan,Nanchong to Pengxi is located in the favorable sedimentary zones of grainstone shoal and dolostone tidal flat facies where reservoirs are developing since they were affected by karstification near Leikoupo 43 Submember denudation border so that they should be the important area of exploration target in central Sichuan Basin.
引文
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[2]黄籍中.从四川盆地看古隆起成藏的两重性[J].天然气工业,2009,29(2):12-17.
[3]韩克猷.川东开江古隆起大中型气田的形成及勘探目标[J].天然气工业,1995,15(4):1-4.
[4]四川省地质矿产局.四川省区域地质志[M].北京:地质出版社,1991.
[5]周进高,辛勇光,谷明峰,等.四川盆地中三叠统雷口坡组天然气勘探方向[J].天然气工业,2010,30(12):16-19.
[6]唐华风,王璞珺,姜传金,等.波形分类方法在松辽盆地火山岩相识别中的应用[J].石油地球物理勘探,2007,42(4):440-444.
[7]邓传伟,李莉华,金银姬,等.波形分类技术在储层沉积微相预测中的应用[J].石油物探,2008,47(3):262-265.
[8]殷积峰,李军,谢芬,等.波形分类技术在川东生物礁气藏预测中的应用[J].石油物探,2007,6(1):53-57.
[9]胡伟光.地震相波形分类技术在川东北的应用[J].勘探地球物理进展,2010,33(1):52-57.
[10]程耀清,蔡东梅.地震相技术应用实例[J].石油地球物理勘探,2007,42(增刊):79-82.
[11]吕景英.用波形分析法预测塔河油田碳酸盐岩储层[J].勘探地球物理进展,2004,27(2):112-116.
[12]王金铎,徐淑梅,于建国,等.用波形分析法预测滨浅湖滩坝砂岩储层:以东营凹陷西部地区沙4上亚段为例[J].地球科学,2008,33(5):627-633.
[13]赵裕辉,邓军.精细波形分类法在塔河油田碳酸盐岩储层预测中的应用[J].吐哈油气,2009,14(1):75-79.
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