本文選題：致密氣儲層 + 應(yīng)力-應(yīng)變曲線��； 參考：《巖性油氣藏》2017年03期

【摘要】：巖石的脆性研究對致密氣的勘探開發(fā)具有重要意義。儲層巖石脆性越高,壓裂后裂縫越發(fā)育,產(chǎn)能越高。以鄂爾多斯盆地東北部二疊系致密氣儲層為研究對象,通過研究脆性巖石的單軸壓裂起裂機(jī)制,以單軸壓裂曲線的起裂點(diǎn)和峰值點(diǎn)的應(yīng)力與應(yīng)變?yōu)榛A(chǔ),結(jié)合多種脆性計(jì)算公式,建立了新的脆性指數(shù)計(jì)算模型。研究表明:利用新模型計(jì)算的脆性指數(shù)與基于靜態(tài)巖石力學(xué)參數(shù)計(jì)算的脆性指數(shù)具有很明顯的函數(shù)關(guān)系,可以有效表征研究區(qū)巖石的脆性;基于單軸抗壓實(shí)驗(yàn)的壓裂效果,利用新建立的脆性指數(shù)和初裂點(diǎn)指數(shù)可以有效地建立儲層的壓裂效果劃分標(biāo)準(zhǔn)。該研究成果豐富了儲層脆性計(jì)算的方法,建立了新的脆性評價(jià)標(biāo)準(zhǔn)。
[Abstract]:The study of rock brittleness is of great significance to the exploration and development of dense gas. The higher the brittleness of reservoir rock, the more developed fracture and productivity after fracturing. Taking Permian tight gas reservoir in northeastern Ordos Basin as the research object, the fracture initiation mechanism of brittle rock under uniaxial fracturing is studied, and the stress and strain of the starting point and peak point of uniaxial fracturing curve are taken as the basis. A new model for calculating brittleness exponent is established by combining various formulas of brittleness calculation. The results show that the brittleness exponent calculated by the new model has an obvious functional relationship with the brittleness index calculated on the basis of static rock mechanics parameters, which can effectively characterize the brittleness of rock in the study area, and the fracturing effect based on uniaxial compression test. Using the newly established brittleness index and initial fracture point index, the fracturing effect classification standard of reservoir can be established effectively. The research results enrich the method of reservoir brittleness calculation and establish a new criterion for brittleness evaluation.
【作者單位】： 長江大學(xué)地球物理與石油資源學(xué)院;長江大學(xué)油氣資源與勘探技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家杰出青年科學(xué)基金項(xiàng)目“致密氣儲層巖石導(dǎo)電機(jī)理研究及飽和度評價(jià)”(編號:41404084) 湖北省自然科學(xué)青年基金項(xiàng)目“基于等效巖石單元模型的滲透率測井評價(jià)方法研究”(編號:2013CFB396)聯(lián)合資助
【分類號】：TE311
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本文編號：2072671