本文選題：高磨地區(qū) + 核磁實驗��； 參考：《天然氣地球科學(xué)》2017年08期

【摘要】：四川盆地高磨地區(qū)龍王廟組儲層溶洞、溶孔發(fā)育,且多含有瀝青侵染暗色斑塊。在核磁實驗中,樣品周表面發(fā)育的大量溶孔無法被飽和,從而導(dǎo)致這部分孔洞的核磁信號無法被測量到。在測量烘干巖樣時發(fā)現(xiàn)巖石干樣也會產(chǎn)生一定的核磁信號。因此,針對樣品周表溶孔發(fā)育和干樣信號的問題,設(shè)計了一系列對比實驗來驗證影響的大小及其校正的方法。通過包裹樣品周表、包裹樣品兩端以及裸樣測量3種狀態(tài)下的孔隙度和含水飽和度以及與常規(guī)孔隙度、飽和度測量方案值對比表明,包裹對測量準(zhǔn)確度有明顯的提升。經(jīng)干樣核磁信號與純?yōu)r青核磁信號、瀝青—泥砂混合核磁信號對比實驗證明該地區(qū)碳酸鹽巖儲層干樣的信號為瀝青質(zhì)所產(chǎn)生。扣除干巖樣核磁信號后所求得的孔隙度、飽和度與常規(guī)測量方案有更好的吻合度。進(jìn)一步對比不同實驗狀態(tài)下同一樣品的T2截止值變化表明,T2截止值不受周表孔洞影響,但受瀝青質(zhì)信號的影響。
[Abstract]:The reservoir caverns of Longwangmiao formation in Gaomo area of Sichuan Basin have developed caverns and dissolved pores, and most of them contain bituminous patches. In the nuclear magnetic experiment, a large number of dissolved pores developed on the surface of the sample can not be saturated, which results in the nuclear magnetic signal of this part of the hole can not be measured. In the measurement of dried rock samples, it is found that some nuclear magnetic signals will be produced in dry rock samples. Therefore, a series of comparative experiments were designed to verify the size of the effect and the method of correction for the development of the sample's peripheral dissolved pore and the signal of dry sample. The measurement of porosity and water saturation at the two ends of the sample and the bare sample and the comparison with the conventional porosity and saturation measurements show that the accuracy of the measurement is improved obviously by wrapping the sample table, the two ends of the wrapped sample and the bare sample. The contrast experiment between dry sample nuclear magnetic signal and pure asphalt nuclear magnetic signal and mixed bitumen sand nuclear magnetic signal shows that the dry sample signal of carbonate reservoir in this area is produced by asphaltene. The porosity obtained by deducting the nuclear magnetic signals of dry rock samples shows that the saturation is in better agreement with the conventional measurement scheme. Further comparison of T 2 cutoff values of the same samples under different experimental states shows that the T 2 cutoff values are not affected by peripheral pores but by asphaltene signals.
【作者單位】： 中國石油集團(tuán)測井有限公司;中國地質(zhì)大學(xué)(北京)能源學(xué)院;
【基金】：中國石油股份公司重大科技專項深層高溫高壓測井巖石物理與成像評價技術(shù)研究(編號:2014E-3205) 中國石油集團(tuán)公司重大科技專項(編號:2014E-3205) 國家“863”計劃(編號:2013AA064602)聯(lián)合資助
【分類號】：P618.13;P631.81

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