本文關(guān)鍵詞：鄂爾多斯盆地三疊系長7段致密油成藏機理　出處：《石油勘探與開發(fā)》2016年04期 　論文類型：期刊論文

  更多相關(guān)文章： 鄂爾多斯盆地 三疊系長段 致密油 成藏機理 運聚動力 源儲配置

【摘要】：為研究鄂爾多斯盆地三疊系延長組7段致密油成藏機理和分布特征,對長7段致密儲集層沉積環(huán)境、巖石學(xué)特征、孔喉結(jié)構(gòu)特征、運聚動力和成藏過程等進(jìn)行系統(tǒng)分析。長7段致密油儲集層主要為半深湖—深湖相砂質(zhì)碎屑流沉積和三角洲前緣水下分流河道沉積。場發(fā)射掃描電鏡、CT掃描等高分辨率顯微技術(shù)研究表明,致密油儲集層物性差,發(fā)育微—納米級孔喉,以粒間孔和長石溶孔為主,管束狀和條帶狀孔隙是有利的儲集空間。致密油儲集層生烴和成藏模擬實驗結(jié)果表明,長7段優(yōu)質(zhì)烴源巖生烴增壓動力強,成藏階段儲集層含油飽和度逾50%,隨著動力的持續(xù)增加油氣開始富集,含油飽和度可超70%。長7段致密油源儲共生,烴類在高壓驅(qū)動下,沿著相互疊置的相對高滲砂體、網(wǎng)狀裂縫等輸導(dǎo)體系運移,形成大面積連續(xù)或準(zhǔn)連續(xù)分布的油氣聚集。
[Abstract]:In order to study the mechanism and distribution of tight oil accumulation in member 7 of the Triassic Yanchang formation in Ordos Basin, the sedimentary environment, petrology and pore throat structure of the tight reservoir of member Chang7 are studied. The migration and accumulation dynamics and reservoir forming process were systematically analyzed. The dense oil reservoirs of Chang 7 are mainly composed of semi-deep lacustry-deep lacustrine sandstone clastic flow deposition and delta front underwater distributary channel deposition. Field emission scanning electron microscopy (SEM). Ct scanning and other high-resolution microscopy techniques show that dense oil reservoir has poor physical properties and developed micro-nanometer pore throat, mainly intergranular pore and feldspar solution pore. The experimental results of hydrocarbon generation and reservoir formation in dense oil reservoir show that the hydrocarbon generation pressure of the high quality hydrocarbon source rock of Chang 7 member is strong. The oil saturation of reservoir is over 50% during the reservoir forming stage. With the continuous increase of oil and gas dynamics, the oil saturation can begin to enrich, the oil saturation can exceed 70. 7 member tight oil source storage symbiosis, and the hydrocarbon is driven by high pressure. Along the superimposed relatively high permeability sand bodies, reticular fractures and other transport systems, a large area of continuous or quasi-continuous distribution of oil and gas accumulation is formed.
【作者單位】： 西南石油大學(xué)地球科學(xué)與技術(shù)學(xué)院;中國石油長慶油田公司勘探開發(fā)研究院;低滲透油氣田勘探開發(fā)國家工程實驗室;中國石油長慶油田公司;中國石油勘探開發(fā)研究院;
【基金】：國家重點基礎(chǔ)研究發(fā)展計劃(973)項目“中國陸相致密油(頁巖油)形成機理與富集規(guī)律基礎(chǔ)研究”(2014CB239005-003)
【分類號】：P618.13
【正文快照】：

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