【摘要】：核磁共振凍融法是當(dāng)前非常規(guī)油氣儲層孔隙分布研究的一個熱點技術(shù),但因這類孔隙分布與成因復(fù)雜,使得該方法的適用性和準(zhǔn)確性仍不很確定,是領(lǐng)域研究的難點。為加深對此的認(rèn)識,采用核磁共振凍融法,結(jié)合相對傳統(tǒng)的壓汞法、氮氣吸附法以及核磁共振T2法,分別對頁巖、煤、致密砂巖3類端元非常規(guī)儲層樣品進(jìn)行了孔徑分布特征測試對比研究。結(jié)果表明,核磁共振凍融法在表征非常規(guī)儲層納米孔隙分布特征方面具有很好的適用性和準(zhǔn)確性,但樣品和實驗條件也在一定程度上影響著測試精度,如制樣大小、探針液體的KGibbs-Thomson(KGT)、凍融損傷以及金屬礦物(黃鐵礦)的含量等。因此實際分析中需根據(jù)研究對象選擇合適顆粒大小的樣品進(jìn)行測定,需首先計算得出適合待測樣品的KGT,需要探索新的探針液體,而因大多數(shù)非常規(guī)儲層樣品中的黃鐵礦含量較低(10%),所以測試結(jié)果仍能夠比較完整定量地刻畫孔隙。核磁共振凍融法對于表征非常規(guī)儲層孔隙很有潛力,其適用性和準(zhǔn)確性還需進(jìn)一步探索。
[Abstract]:Nuclear magnetic resonance freeze-thaw method is a hot technique in the study of pore distribution in unconventional oil and gas reservoirs. However, due to the complexity of pore distribution and origin, the applicability and accuracy of this method are still uncertain, which is a difficult point in the field of research. In order to get a better understanding of this problem, nuclear magnetic resonance freeze-thaw method, combined with conventional mercury injection, nitrogen adsorption and nuclear magnetic resonance T2 method, were used to separate shale and coal, respectively. The pore size distribution characteristics of 3 types of tight sandstone unconventional reservoir samples were tested and compared. The results show that nuclear magnetic resonance freeze-thaw method has good applicability and accuracy in characterizing the distribution of nano-pores in unconventional reservoirs, but the sample and experimental conditions also affect the measurement accuracy to a certain extent, such as the size of the sample preparation. The KGibbs-Thomson (KGT), freezing and thawing damage of probe liquid and the content of metallic minerals (pyrite) etc. Therefore, it is necessary to choose the appropriate particle size sample to be determined according to the object of study in the practical analysis. First, the KGT, suitable for the sample to be tested should be calculated and a new probe liquid should be explored. However, the content of pyrite in most unconventional reservoir samples is relatively low (10%), so the test results can still depict pores completely and quantitatively. Nuclear magnetic resonance freeze-thaw method has great potential in characterizing the porosity of unconventional reservoirs, and its applicability and accuracy need to be further explored.
【作者單位】： 南京大學(xué)地球科學(xué)與工程學(xué)院;
【基金】：國家重點基礎(chǔ)研究發(fā)展計劃(973)項目“陸相頁巖油儲集空間與發(fā)育模式”(2014CB239102) 國家重大科技專項(2016ZX05002-006-005) 國家自然科學(xué)基金項目(No.41372127、No.41772128)資助
【分類號】：P618.13

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