本文選題：頁巖氣　切入點：礦物組分　出處：《天然氣地球科學(xué)》2016年03期

【摘要】：頁巖的脆性指數(shù)是頁巖氣水平井體積壓裂設(shè)計中應(yīng)考慮的重要因素之一。為了更全面地表征頁巖的可壓性,探索適用性更好的頁巖脆性指數(shù)預(yù)測方法,以四川盆地涪陵焦石壩地區(qū)奧陶系五峰組—志留系龍馬溪組頁巖為例,在對當(dāng)前常用的脆性預(yù)測方法進行對比分析的基礎(chǔ)上,結(jié)合該區(qū)頁巖地質(zhì)特點及工程地質(zhì)力學(xué)特征,建立了礦物脆性指數(shù)與彈性參數(shù)(楊氏模量、泊松比、拉梅系數(shù)×密度、剪切模量×密度)之間的多元回歸計算模型,形成了基于4個參數(shù)計算模型的疊前脆性預(yù)測技術(shù)。利用疊前彈性參數(shù)反演可以完成脆性指數(shù)數(shù)據(jù)體的預(yù)測,進而實現(xiàn)頁巖層段縱向上優(yōu)質(zhì)壓裂層與平面上甜點壓裂區(qū)的綜合評價。通過已知井檢驗,該方法預(yù)測的脆性指數(shù)與礦物脆性指數(shù)相關(guān)性好,并與工程壓裂時的破裂壓力具有良好的一致性,說明該方法具有較高的可信度和現(xiàn)場實用性,具有較高的推廣價值。
[Abstract]:The brittleness index of shale is one of the important factors that should be considered in the design of shale gas horizontal well volume fracturing.In order to characterize the compressibility of shale more comprehensively and to explore a more suitable prediction method of shale brittleness index, taking the Ordovician Wufeng formation and Silurian Longmaxi formation in Fuling Jiaoshiba area, Sichuan Basin as an example,Based on the comparison and analysis of the commonly used brittleness prediction methods, combined with the characteristics of shale geology and engineering geology in this area, the mineral brittleness index and elastic parameters (Young's modulus, Poisson's ratio, Lamy coefficient 脳 density) are established.The prestack brittleness prediction technique based on four parameter calculation models is developed by using multiple regression model between shear modulus and density.By using prestack elastic parameter inversion, the prediction of brittle index data body can be completed, and the comprehensive evaluation of high quality fracturing layer in shale section and dessert fracturing area in plane can be realized.The known well tests show that the predicted brittleness index of this method is well correlated with the mineral brittleness index, and is in good agreement with the fracture pressure during engineering fracturing, which indicates that the method has a high reliability and practicability in the field.It has high promotion value.
【作者單位】： 中國石油化工股份有限公司勘探分公司;
【基金】：中國石油化工集團公司重大專項“四川盆地周緣下組合頁巖氣形成條件與有利區(qū)帶評價”(編號:P13129)資助
【分類號】：TE31

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本文編號：1714614