阿姆河右岸区块生物礁特征与识别方法
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摘要
土库曼斯坦阿姆河右岸区块储集层以礁灰岩为主,在该储层之上发育着巨厚的膏盐岩地层,使其地震勘探的难度增大。为此,依据该区块礁灰岩的分布特点,综合测井、地质资料建立了沉积模型、储层模型和地震正演模型,分析了礁体的地球物理响应特征。利用常规测井资料和测试资料,从单井上识别礁体;引入"地震相"的研究思路,利用地震属性,对礁体平面分布进行预测;根据上覆膏盐层厚度变化、目的层碳酸盐岩厚度的变化,采用"时差厚度"法进行礁体识别,初步探索出一套适合于该区的基于叠后地震资料的礁体识别方法。利用该方法提高了生物礁的识别精度,在该区块相继发现了一批可供钻探的生物礁,钻遇生物礁的探井成功率从中方接手前的33%提高到现今的100%。
The reservoirs in the Amu Darya Right Bank Block,Turkmenistan,are dominated by reef limestone,which are overlain by a very thick salt layer,increasing the complexity of seismic exploration.According to the features of reef limestone distribution in the study area and in combination with the log and geologic data,sedimentary models,reservoir models and seismic forward models are built,and the geophysical responses of the reefs are analyzed.The conventional log data and test data are used to identify reefs in a single well.Seismic attributes are used to predict the areal distribution of the reefs.According to the variations of the overlying salt layer thickness and the pay zone of carbonates,the "interval transit time thickness" method is used to identify reefs.Based on these studies,we develop a set of methods to identify reefs in the study area by using post-stack seismic data.These methods significantly enhance the accuracy of reef identification.Several bioherms are successively identified as drilling targets.The success rate of exploratory wells that penetrate bioherms is increased from previous 33% to current 100%.
The reservoirs in the Amu Darya Right Bank Block,Turkmenistan,are dominated by reef limestone,which are overlain by a very thick salt layer,increasing the complexity of seismic exploration.According to the features of reef limestone distribution in the study area and in combination with the log and geologic data,sedimentary models,reservoir models and seismic forward models are built,and the geophysical responses of the reefs are analyzed.The conventional log data and test data are used to identify reefs in a single well.Seismic attributes are used to predict the areal distribution of the reefs.According to the variations of the overlying salt layer thickness and the pay zone of carbonates,the "interval transit time thickness" method is used to identify reefs.Based on these studies,we develop a set of methods to identify reefs in the study area by using post-stack seismic data.These methods significantly enhance the accuracy of reef identification.Several bioherms are successively identified as drilling targets.The success rate of exploratory wells that penetrate bioherms is increased from previous 33% to current 100%.
引文
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[5]邬光辉,黄广建,王振宇,等.塔中奥陶系生物礁地震识别与预测[J].天然气工业,2007,27(4):40-42.
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