本文選題：微觀特征　切入點(diǎn)：形成機(jī)理　出處：《石油與天然氣地質(zhì)》2017年01期 　論文類(lèi)型：期刊論文

【摘要】：鄂爾多斯盆地隴東地區(qū)長(zhǎng)(延長(zhǎng)組)6段和長(zhǎng)7段富含大量致密油,但由于對(duì)其微觀特征與成因缺乏深入了解,阻礙了該區(qū)致密油的有效開(kāi)采。為此,根據(jù)巖石孔隙鑄體薄片、場(chǎng)發(fā)射掃描電鏡等技術(shù),對(duì)研究區(qū)長(zhǎng)6段和長(zhǎng)7段致密油儲(chǔ)層微觀特征及其成因進(jìn)行了深入研究。結(jié)果表明:研究區(qū)致密油儲(chǔ)層形成于三角洲前緣遠(yuǎn)端遠(yuǎn)砂壩-席狀砂及半深湖-深湖重力流沉積環(huán)境,巖石粒度細(xì)(主要為極細(xì)砂巖、粉砂巖、泥質(zhì)粉砂巖及粉砂質(zhì)泥巖)、雜基含量高(8%~10%),幾種儲(chǔ)集巖的孔隙均極不發(fā)育,面孔率低,平均1.8%,孔徑小(平均30μm),喉道細(xì)(平均0.08μm),平均孔隙度9%,滲透率基本上都低于0.3×10~(-3)μm~2,物性差�？紫额�(lèi)型主要為粒間雜基微孔、長(zhǎng)石及巖屑溶孔、膠結(jié)物晶間微孔。不同巖石類(lèi)型其微觀特征存在差異。沉積環(huán)境決定了其粒度細(xì)、粘土雜基高,細(xì)粒高粘土雜基巖石抗壓性差,強(qiáng)烈的壓實(shí)作用導(dǎo)致大量的原生孔隙損失,孔喉變得更加細(xì)小;孔喉細(xì)小的巖石由于孔隙中各種流體離子的半滲透膜效應(yīng)引起強(qiáng)烈的碳酸鹽和粘土礦物膠結(jié),尤其是伊利石搭橋狀和絲網(wǎng)狀膠結(jié),使巖石孔隙度滲透率進(jìn)一步變差,后期酸性流體也難以進(jìn)入發(fā)生溶蝕作用;云母與水云母雜基及碳酸鹽膠結(jié)物對(duì)石英的強(qiáng)烈交代導(dǎo)致巖石抗壓性變差以及固體體積增加,最終導(dǎo)致巖石的致密化。
[Abstract]:The Chang (Yanchang formation No. 6 and Chang 7 member) in Longdong area of Ordos Basin is rich in a large amount of dense oil, but the lack of a deep understanding of its microscopic characteristics and genesis hinders the effective exploitation of dense oil in this area. Therefore, according to the thin section of rock pore casting, Field emission scanning electron microscopy, The microcosmic characteristics and genesis of dense oil reservoirs in Chang6 and Chang7 members of the study area are studied. The results show that the tight oil reservoirs in the study area were formed in the distal delta front bar sheet sand and the semi-deep lacustry-deep lake gravity flow sedimentary environment. Fine grain size of rocks (mainly very fine sandstone, siltstone, argillaceous siltstone and silty mudstone), high content of complex base 8 ~ 10 ~ 10, porosity of several types of reservoir rocks are extremely undeveloped, and the porosity of several reservoir rocks is low. The average pore size is 1.8 渭 m, the pore diameter is small (30 渭 m ~ (-1) on average, the throat is fine (0.08 渭 m ~ (-1) on average, the average porosity is 9%, the permeability is basically less than 0.3 脳 10 ~ (-3)) 渭 m ~ (-2), and the physical properties are poor. The pore types are mainly intergranular micropores, feldspar and lithic micropores, The micropores of cemented materials are intergranular. The microcosmic characteristics of different rock types are different. The sedimentary environment determines the fine grain size, the high clay heterogeneity, the poor compressive resistance of fine grained clay complex rock, and the strong compaction results in a large number of primary pore loss. The pore throat became finer; the pore throat fine rock caused strong carbonate and clay mineral cementation due to the semi-permeable membrane effect of various fluid ions in the pore, especially the Illite bridging and silk mesh cementation. The porosity and permeability of rock become worse, and it is difficult for acid fluid to dissolve in the later stage, and the strong metasomatism of mica, hydromica hetero group and carbonate cement to quartz leads to the deterioration of rock compressive resistance and the increase of solid volume. Finally, the densification of the rock.
【作者單位】： 中國(guó)石油大學(xué)(北京)油氣資源與探測(cè)國(guó)家重點(diǎn)實(shí)驗(yàn)室;中國(guó)石油大學(xué)(北京)地球科學(xué)學(xué)院;
【基金】：國(guó)家科技重大專(zhuān)項(xiàng)(2016ZX05002-004-009) 國(guó)家自然科學(xué)基金項(xiàng)目(41072104)
【分類(lèi)號(hào)】：P618.13

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