【摘要】：為了揭示鄂爾多斯盆地石盒子組8段砂巖儲(chǔ)層中長石異常分布及成因,在盆地尺度范圍內(nèi),利用大量巖石薄片、陰極發(fā)光、掃描電鏡分析手段,研究了儲(chǔ)層巖石學(xué)特征及長石分布特征;并在此基礎(chǔ)上,結(jié)合真實(shí)巖心酸溶蝕模擬實(shí)驗(yàn)、埋藏史、熱史及成巖特征,探討了長石異常分布的成因,認(rèn)為長石的減少與成巖過程中溶蝕作用密切相關(guān).研究結(jié)果表明:鄂爾多斯盆地腹部盒8段致密砂巖在成巖前存在大量長石(百分比平均為7.5%),而現(xiàn)今砂巖中低或無長石使得儲(chǔ)層演化為具有"高成分成熟度"的石英砂巖和巖屑石英砂巖,這一現(xiàn)象與盆地周緣相對(duì)高長石含量形成明顯的差異.現(xiàn)今長石的產(chǎn)狀主要表現(xiàn)為完全溶蝕型,碳酸鹽巖充填型及高嶺石化型;地質(zhì)歷史時(shí)期長石的溶蝕需在高溫條件下進(jìn)行,而盒8段儲(chǔ)層在溶蝕作用期疊加的一次熱異常事件促使了上古生界煤系烴源巖的生烴作用,為長石的大量溶蝕提供了持續(xù)高溫和酸性介質(zhì)條件,使得在相對(duì)高熱演化的腹部地區(qū)溶蝕作用強(qiáng)烈,儲(chǔ)層中長石百分比小于1%,局部地區(qū)(蘇里格地區(qū))甚至為零,長石的大量溶蝕很好地改善了致密砂巖儲(chǔ)集空間;而在熱演化程度較低的邊緣地區(qū)溶蝕作用較弱,長石保存相對(duì)較好,溶孔發(fā)育較少.對(duì)鄂爾多斯盆地砂巖儲(chǔ)層中長石的異常分布研究有助于今后致密氣甜點(diǎn)區(qū)的預(yù)測.
[Abstract]:In order to reveal the anomalous distribution and genesis of feldspar in 8 member sandstone reservoirs of Shihezi formation in Ordos Basin, a large number of thin pieces of rock, cathodic luminescence and scanning electron microscopy were used in the basin scale. The petrological characteristics and feldspar distribution characteristics of reservoir are studied, and on the basis of this, the origin of the abnormal distribution of feldspar is discussed in combination with the simulation experiment of acid dissolution in real rock core, burial history, thermal history and diagenetic characteristics. It is considered that the reduction of feldspar is closely related to dissolution during diagenesis. The results show that there are a large number of feldspar (average 7.5%) before diagenesis in tight sandstone of Bo8 member in the abdomen of Ordos Basin, while the present sandstone with low or no feldspar makes the reservoir evolve into a stone with "high compositional maturity". British sandstone and lithic quartz sandstone, This phenomenon is obviously different from the relatively high feldspar content around the basin. The occurrence of feldspar is mainly composed of complete dissolution type, carbonate filling type and kaolinite type, and the dissolution of feldspar in geological history period needs to be carried out under high temperature. However, a superimposed thermal anomaly event in the reservoir of member 8 during dissolution promotes the hydrocarbon generation of the Upper Paleozoic coal measure source rock, and provides a continuous high temperature and acidic medium for the mass dissolution of feldspar. The dissolution of feldspar in the relatively high heat evolution area is strong, the percentage of feldspar in reservoir is less than 1, the local area (Sulige area) is even zero, and the large amount of dissolution of feldspar can improve the reservoir space of tight sandstone. On the other hand, the dissolution of feldspar is weaker, the feldspar is better preserved and the dissolution pore is less developed in the edge area with lower thermal evolution. The study of the anomalous distribution of feldspar in sandstone reservoirs in Ordos Basin is helpful to predict the dense gas desserts in the future.
【作者單位】： 中國石油勘探開發(fā)研究院廊坊分院;中國石油大學(xué)(北京)油氣資源與探測國家重點(diǎn)實(shí)驗(yàn)室;長慶油田分公司勘探開發(fā)研究院;
【基金】：國家科技重大專項(xiàng)(2016ZX05007-003) 中國石油天然氣股份有限公司重大科技專項(xiàng)(2011E-1301)
【分類號(hào)】：P618.13

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