本文選題：姬塬地區(qū) + 致密砂巖儲(chǔ)層��； 參考：《長(zhǎng)安大學(xué)》2015年博士論文

【摘要】：鄂爾多斯盆地姬塬地區(qū)延長(zhǎng)組長(zhǎng)8儲(chǔ)層是典型的致密砂巖儲(chǔ)層,儲(chǔ)層致密與油氣充注成藏關(guān)系的研究對(duì)認(rèn)識(shí)該區(qū)石油富集規(guī)律及指導(dǎo)勘探開發(fā)部署具有一定的理論和現(xiàn)實(shí)意義。論文以巖芯觀察為基礎(chǔ),綜合應(yīng)用巖石薄片、鑄體薄片、掃描電鏡、粒度分析、X衍射、常規(guī)壓汞、恒速壓汞、電子探針、碳氧同位素、油氣包裹體等多種分析測(cè)試資料,對(duì)儲(chǔ)層巖石學(xué)及儲(chǔ)集性能、成巖作用特征以及儲(chǔ)層致密與油氣充注成藏關(guān)系進(jìn)行研究,揭示相對(duì)優(yōu)質(zhì)儲(chǔ)層的主控因素,建立研究區(qū)致密砂巖儲(chǔ)層的綜合評(píng)價(jià)標(biāo)準(zhǔn),對(duì)儲(chǔ)層進(jìn)行評(píng)價(jià)預(yù)測(cè)。研究表明,姬塬地區(qū)長(zhǎng)8儲(chǔ)層以細(xì)粒長(zhǎng)石巖屑砂巖和巖屑長(zhǎng)石砂巖為主,填隙物含量較高,巖石總體成分成熟度低、結(jié)構(gòu)成熟度中等。儲(chǔ)層孔隙度平均為8.67%,滲透率平均為0.46×10-3μm2,物性總體為低孔超低滲。儲(chǔ)層孔隙結(jié)構(gòu)可劃分為4種類型,以Ⅱ類較低排驅(qū)壓力—小孔喉型占主導(dǎo)地位。儲(chǔ)層孔隙半徑主要分布(80~250)μm之間,屬于大孔隙的范疇。隨著滲透率增加,喉道半徑分布范圍變寬,而孔喉半徑比分布高值比例減小。儲(chǔ)層物性與分選系數(shù)、最大進(jìn)汞飽和度、孔隙和喉道進(jìn)汞飽和度為正相關(guān)性,與結(jié)構(gòu)系數(shù)為負(fù)相關(guān)性。研究區(qū)長(zhǎng)8儲(chǔ)層成巖作用類型豐富復(fù)雜,主要包括壓實(shí)、膠結(jié)、溶蝕等作用。成巖演化普遍達(dá)到中成巖階段A期。定量計(jì)算視壓實(shí)率平均為0.42,視膠結(jié)率平均為0.58,壓實(shí)和膠結(jié)強(qiáng)度均為中等偏強(qiáng)。視溶蝕率平均為0.34,為中等強(qiáng)度溶蝕。確定靜水條件下浮力運(yùn)移的臨界喉道半徑上限為0.592μm,推算儲(chǔ)層致密的孔隙度上限為12%�？紫堆莼坑�(jì)算表明,壓實(shí)后剩余孔隙度分布在19.7%~25.56%之間,膠結(jié)作用后孔隙度普遍小于12%。壓實(shí)作用造成原生孔隙大量減少,而晚期膠結(jié)作用是造成研究區(qū)長(zhǎng)8儲(chǔ)層致密的根本原因。儲(chǔ)層致密與油氣充注成藏時(shí)序關(guān)系研究表明,中侏羅世之后,低熟油氣開始逐漸形成并充注,在早白堊早期油氣小規(guī)模成藏,早白堊世中期油氣大規(guī)模充注成藏,油氣大規(guī)模成藏與姬塬地區(qū)長(zhǎng)8儲(chǔ)層致密同時(shí)進(jìn)行。致密砂巖儲(chǔ)層在整體低孔、低滲的背景上仍發(fā)育部分相對(duì)優(yōu)質(zhì)儲(chǔ)層,其控制因素有沉積作用、成巖儲(chǔ)集相及構(gòu)造裂隙等。在常規(guī)儲(chǔ)層評(píng)價(jià)基礎(chǔ)上,優(yōu)選排驅(qū)壓力、孔隙結(jié)構(gòu)類型、喉道半徑等反映致密砂巖儲(chǔ)層孔隙結(jié)構(gòu)特征的新參數(shù),建立儲(chǔ)層的綜合評(píng)價(jià)標(biāo)準(zhǔn),預(yù)測(cè)研究區(qū)內(nèi)優(yōu)質(zhì)儲(chǔ)層的分布,指導(dǎo)下步的勘探開發(fā)部署。
[Abstract]:Yanchang formation 8 reservoir in Jiyuan area of Ordos Basin is a typical tight sandstone reservoir. The study on the relationship between reservoir density and oil and gas accumulation is of theoretical and practical significance in understanding the law of oil enrichment and guiding exploration and development in this area. On the basis of core observation, the paper synthetically applies various analytical and testing data, such as rock thin slice, cast thin piece, scanning electron microscope, particle size analysis X diffraction, conventional mercury injection, constant velocity mercury pressure, electron probe, carbon and oxygen isotope, oil and gas inclusion, etc. The petrology and reservoir properties, diagenesis characteristics and the relationship between reservoir compactness and oil-gas filling and reservoir formation are studied, the main controlling factors of relatively high quality reservoirs are revealed, and the comprehensive evaluation criteria for tight sandstone reservoirs in the study area are established. The reservoir is evaluated and forecasted. The results show that the Chang 8 reservoir in Jiyuan area is dominated by fine feldspar lithic sandstone and lithic feldspathic sandstone with high content of interstitial matter low maturity of the total composition of rock and moderate structural maturity. The average porosity and permeability of the reservoir are 8.67 and 0.46 脳 10 ~ (-3) 渭 m ~ (2), respectively. The pore structure of the reservoir can be divided into four types, and the type 鈪，

本文編號(hào)：1908968