發(fā)布時間：2018-03-26 22:01

  本文選題：聲波時差　切入點：壓實曲線　出處：《中國石油大學(xué)學(xué)報(自然科學(xué)版)》2016年03期

【摘要】：高豐度有機質(zhì)導(dǎo)致的聲波時差異常高值不能客觀反映地層孔隙度的變化,定量研究有機質(zhì)對壓實曲線的影響才能減小壓實研究結(jié)果的不確定性。從泥巖壓實研究的原理出發(fā),構(gòu)建考慮干酪根的巖石等效體積模型,提出有機質(zhì)引起聲波時差增量的校正公式;以鄂爾多斯盆地南部鎮(zhèn)涇地區(qū)為例,討論壓實曲線有機質(zhì)校正方法的實用性及可靠性。結(jié)果表明:烴源巖層段高豐度有機質(zhì)往往造成壓實規(guī)律的較大誤差,壓實研究中應(yīng)當(dāng)消除有機質(zhì)對聲波時差的影響;鎮(zhèn)涇地區(qū)泥巖壓實曲線經(jīng)過校正后,正常壓實趨勢線斜率減小約30%~55%;長7段底部頁巖欠壓實幅度顯著降低,最大埋深時期的剩余壓力約為3~5 MPa,相比于校正前降低5~8 MPa,反映出以往研究可能過高地估計了長7段古超壓的幅度;利用校正后聲波時差計算的泥巖孔隙度與實測孔隙度吻合性較好,且計算的流體壓力與數(shù)值模擬結(jié)果一致,證實提出的定量校正方法能夠有效地消除研究區(qū)有機質(zhì)造成的聲波時差異常,可作為鄂爾多斯盆地及其他地區(qū)壓實研究的借鑒。
[Abstract]:The high value of sonic time difference caused by high abundance organic matter can not objectively reflect the change of formation porosity. Only by studying quantitatively the influence of organic matter on compaction curve can the uncertainty of compaction research result be reduced. Based on the principle of mudstone compaction study, The equivalent volume model of rock considering kerogen is constructed, and the correction formula of acoustic time difference increment caused by organic matter is put forward, taking Zhenjing area in the south of Ordos Basin as an example, The practicability and reliability of organic matter correction method for compaction curves are discussed. The results show that the high abundance organic matter in source rock formation often leads to large errors in compaction law and the influence of organic matter on acoustic moveout should be eliminated in compaction research. After correcting the compaction curve of mudstone in Zhenjing area, the slope of the normal compaction trend line decreases by about 300.55, and the undercompaction amplitude of shale at the bottom of Chang7 section decreases significantly. The residual pressure in the period of maximum buried depth is about 3 ~ 5 MPA, which is 5 ~ 8 MPA lower than that before correction, which indicates that the amplitude of paleo overpressure in Chang 7 segment may be overestimated by previous studies. The porosity of mudstone calculated by corrected acoustic moveout is in good agreement with the measured porosity, and the calculated fluid pressure is in agreement with the numerical simulation results. It is proved that the proposed quantitative correction method can effectively eliminate the sonic time difference anomaly caused by organic matter in the study area and can be used as a reference for the compaction study in Ordos Basin and other areas.
【作者單位】： 中國科學(xué)院地質(zhì)與地球物理研究所油氣資源研究重點實驗室;中國科學(xué)院大學(xué);中國石油大學(xué)地球科學(xué)與技術(shù)學(xué)院;中國石化石油勘探開發(fā)研究院;
【基金】：國家自然科學(xué)基金項目(41372151) 國家科技重大專項(2011ZX05008-004) 中國博士后科學(xué)基金項目(2015M570148)
【分類號】：TE311

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