本文選題：儲(chǔ)集層 + 巖溶洞穴　； 參考：《古地理學(xué)報(bào)》2017年03期

【摘要】：中下奧陶統(tǒng)碳酸鹽巖古巖溶型儲(chǔ)集層的特征、演化及縱橫向分布是塔里木盆地玉北地區(qū)勘探關(guān)注的重要問題,而YB7井在鷹山組鉆遇的溶洞及其充填物為研究該地區(qū)中下奧陶統(tǒng)古巖溶作用提供了契機(jī)。研究區(qū)YB7井中下奧陶統(tǒng)鷹山組溶洞充填物以長(zhǎng)石石英砂巖為主,文中將其稀土元素組成特征與該地區(qū)志留系依木干他烏組和克孜爾塔格組、泥盆系東河塘組、石炭系巴楚組及塔中地區(qū)志留系柯坪塔格組和塔塔埃爾塔格組進(jìn)行對(duì)比,以分析其物源及溶洞的演化時(shí)限。結(jié)果顯示:4個(gè)溶洞充填物樣品稀土元素配分模式表現(xiàn)為輕稀土輕微富集,重稀土稍顯虧損,具有明顯的Ce負(fù)異常和輕微的Eu正異常,與東河塘組和柯坪塔格組的特征較為接近。溶洞充填物的ΣREE平均為36.48μg/g,與東河塘組最為接近,而與柯坪塔格組相距甚遠(yuǎn)。玉北地區(qū)缺失柯坪塔格組,至巴楚組沉積前一直處于構(gòu)造高部位,故柯坪塔格組不具備為YB7井溶洞提供物源的基礎(chǔ)。玉北地區(qū)西部局部鉆遇東河塘組,而YB7井周邊缺失該組,故綜合稀土元素組成特征、沉積特征及構(gòu)造背景認(rèn)為,YB7井溶洞充填物來源于東河塘組,其形成于暗河系統(tǒng),且東河塘組沉積后至巴楚組沉積前是玉北地區(qū)重要的巖溶儲(chǔ)集層發(fā)育時(shí)期。
[Abstract]:The characteristics, evolution and vertical and horizontal distribution of paleokarst reservoirs of carbonate rocks in the Middle and Lower Ordovician are the important problems of exploration in Yabei area of Tarim Basin. The karst cave and its backfill in YB7 well in Yingshan formation provide an opportunity to study the paleokarst in middle and lower Ordovician in this area. In YB7 well, the cavern filling of Yingshan formation of Lower Ordovician is mainly composed of feldspar quartz sandstone. In this paper, the REE composition of YB7 well is related to the Silurian Yimugantawu formation and Kiziltag formation, and the Devonian Donghetang formation. Carboniferous Bachu formation and Silurian Kepingtag formation and Tata Ertag formation in Tazhong area were compared to analyze their provenance and evolution time of karst cave. The results showed that the REE partitioning patterns of the four cavern filling samples showed slight enrichment of LREE, slight depletion of heavy REE, obvious negative ce anomaly and slight EU positive anomaly, which were close to the characteristics of Donghetang formation and Kepingtag formation. The average 危 REE of cavern filling is 36.48 渭 g / g, which is the closest to Donghetang formation and far away from Kepingtag formation. The Kepingtag formation is absent in the north of Yubei area and has been in the high position of the structure until the Bachu formation, so the Kepingtag formation does not have the foundation to provide the material source for the karst cave of YB7 well. In the western part of Yubei area, the formation of Donghetang formation is locally drilled, and the periphery of YB7 well is missing. Therefore, the composition of rare earth elements, sedimentary characteristics and tectonic background indicate that the cavern filling of YB7 well originated from the Donghetang formation and formed in the dark river system. The period from Donghetang formation to Bachu formation is an important karst reservoir development period in Yubei area.
【作者單位】： 中國(guó)石化石油勘探開發(fā)研究院;中國(guó)石化西北油田分公司勘探開發(fā)研究院;中國(guó)地質(zhì)大學(xué)(北京)地球科學(xué)與資源學(xué)院;
【基金】：國(guó)家科技重大專項(xiàng)(編號(hào):2016ZX05005-002) 中國(guó)石化科技部項(xiàng)目(編號(hào):P13069,P14123,P15090)聯(lián)合資助~~
【分類號(hào)】：P534.42;P618.13

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