鄂爾多斯盆地湖盆區(qū)延長(zhǎng)組致密油“甜點(diǎn)”控制因素及預(yù)測(cè)方法
本文關(guān)鍵詞:鄂爾多斯盆地湖盆區(qū)延長(zhǎng)組致密油“甜點(diǎn)”控制因素及預(yù)測(cè)方法 出處:《地質(zhì)科技情報(bào)》2017年04期 論文類型:期刊論文
更多相關(guān)文章: 鄂爾多斯盆地 致密油 控制因素 疊前、疊后反演 分頻衰減
【摘要】:鄂爾多斯盆地湖盆區(qū)中生界延長(zhǎng)組廣泛發(fā)育致密油儲(chǔ)層。對(duì)測(cè)井、巖心以及地震資料的綜合研究表明:含油性主要受到烴源巖厚度與儲(chǔ)層層位、平面位置的控制。烴源巖厚度越大,則其上覆儲(chǔ)層含油性越好;湖盆華池、慶城一帶致密儲(chǔ)層自長(zhǎng)61至長(zhǎng)72越接近烴源巖,其含油性越好。致密油碎屑巖儲(chǔ)層與圍巖地震波阻抗差異較小,應(yīng)用常規(guī)地震勘探方法較難識(shí)別。采用疊前反演、疊后反演、疊后能量衰減等多種地震方法進(jìn)行了試驗(yàn)研究。結(jié)果表明:疊前縱波阻抗以及λρ參數(shù)反演可以較好地反映含油砂巖成層性和疊置性;疊后密度反演與疊前反演結(jié)合,可以在平面上判斷不同時(shí)期含油砂體平面展布范圍;分頻衰減技術(shù)在剖面上可以較好地區(qū)分油層和干層,油層的調(diào)諧振幅頻率往往比干層小5~10Hz,通過(guò)分頻體相減的方法可以在平面上判斷含油砂巖分布范圍。
[Abstract]:Dense oil reservoirs are widely developed in the Mesozoic Yanchang formation in the lake basin area of Ordos Basin. The comprehensive study of logging, core and seismic data shows that the oil-bearing properties are mainly due to the source rock thickness and reservoir layers. The greater the thickness of the source rock, the better the oil content of the overlying reservoir; The closer the tight reservoir from Chang61 to Chang72 in Huachi Lake Basin and Qingcheng area, the better its oil content. The difference of seismic wave impedance between tight oil clastic rock reservoir and surrounding rock is small. It is difficult to identify by using conventional seismic exploration methods. Prestack inversion and poststack inversion are used. Many seismic methods, such as post-stack energy attenuation, have been tested and studied. The results show that the inversion of prestack P-wave impedance and 位 蟻 parameters can well reflect the stratification and superposition of oil-bearing sandstone; The combination of poststack density inversion and prestack inversion can determine the distribution range of oil-bearing sand bodies in different periods on the plane. The technique of frequency division and attenuation can be used to distinguish the reservoir from the dry layer well, and the tuning amplitude frequency of the reservoir is often 5 ~ 10 Hz smaller than that of the dry layer. The distribution range of oil-bearing sandstone can be judged on the plane by subtraction of frequency divider.
【作者單位】: 西北大學(xué)大陸動(dòng)力學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室;西北大學(xué)地質(zhì)學(xué)系;中國(guó)石油長(zhǎng)慶油田勘探開發(fā)研究院;中國(guó)石油長(zhǎng)慶油田低滲透油氣田勘探開發(fā)國(guó)家工程實(shí)驗(yàn)室;
【基金】:國(guó)家自然科學(xué)基金重大項(xiàng)目(41390451) 長(zhǎng)慶油田企業(yè)項(xiàng)目
【分類號(hào)】:P618.13;P631
【正文快照】: 因素及預(yù)測(cè)方法李坤白1a,1b,趙玉華2a,2b,蒲仁海1a,1b,張杰2a,2b,徐鵬曄1a,1b,張盟勃2a,2b(1.西北大學(xué)a.大陸動(dòng)力學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室;b.地質(zhì)學(xué)系,西安710069;2.中國(guó)石油長(zhǎng)慶油田a.勘探開發(fā)研究院;b.低滲透油氣田勘探開發(fā)國(guó)家工程實(shí)驗(yàn)室,西安710018)致密油是繼頁(yè)巖氣之后全球非常
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