Prediction of Triassic gypsum cap rocks in Tongnanba region of Northeast Sichuan Basin
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摘要: 在精细地层对比、膏盐岩岩石物理分析以及模型正演的基础上,确定了川东北通南巴地区膏盐岩盖层的地球物理响应特征;利用神经网络地震相分析技术刻画了盖层发育相带展布;采用三维地震属性分析、小波分频解释和密度反演等技术预测了膏盐岩盖层分布,建立了一套适合该区膏盐岩盖层的预测技术方法,并对研究区盖层与油气关系进行了初步分析。认为该区主要发育3套膏盐岩盖层,而嘉四五段—雷一段膏盐岩厚度大、蠕动性好,对断层具自封闭效应,是最有利的区域盖层,但封盖条件受断层活动规模影响。该区南部断裂活动弱,往北活动增强,北部断裂封盖条件存在风险。Abstract: Based on detailed stratigraphic correlation,gypsum-salt rock petrophysical analyses and forward mo-deling,it was identified in this paper the seismic response characteristics of gypsum-salt cap rocks in Tongnanba region of the Northeast Sichuan Basin.With neural network seismic facies analysis method,the beneficial facies distribution of cap rocks was figured out.Using 3-D seismic attribute analysis,wavelet frequency interpretation and density inversion technologies,a set of prediction method suitable for the gypsum-salt cap rocks in the region was proposed.The relationship between cap rocks and petroleum in the region was analyzed.There were 3 suits of gypsum-salt cap rocks in the region,among which the gypsum-salt cap rocks from the 4th,5th Members of the Jialingjiang Formation to the 1st Member of the Leikoupo Formation were the best beneficial regional cap rocks due to big thickness,well crawling and self-sealing to faults;however,the sealing conditions were affected by fault activities.Fault activities increased from south to north,resulting in more risks for fault-sealing in the north.
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Key words:
- gypsum-salt rock /
- cap rock /
- marine strata /
- Triassic /
- Tongnanba region /
- Northeast Sichuan Basin
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