本文關(guān)鍵詞：鄂爾多斯盆地東緣煤層氣成藏地質(zhì)模型，由筆耕文化傳播整理發(fā)布。

鄂爾多斯盆地東緣煤層氣成藏地質(zhì)模型

The Geological Model of Coalbed Methane（CBM）Reservoir in the Eastern Ordos Basin

[1] [2]

LI Gui-hong,ZHANG Hong （Xi＇an Research Institute of China Coal Technology ＆ Engineering Group Corp. , Xi＇an 710054 ,China）

中煤科工集團(tuán)西安研究院有限公司,陜西西安710054

文章摘要：鄂爾多斯盆地東緣煤層氣勘探開發(fā)有20余年歷史,近年來在保德、柳林等區(qū)塊規(guī)�；_發(fā)迅速發(fā)展,但總體上全區(qū)產(chǎn)業(yè)化發(fā)展并不均衡。除工程因素外,對煤層氣地質(zhì)條件的認(rèn)識仍然存在分歧,煤層氣成藏地質(zhì)模型可以為勘探選區(qū)提供借鑒。通過對鄂爾多斯盆地東緣構(gòu)造格架、地層層序、水動(dòng)力條件及氣體成因的研究,構(gòu)建了研究區(qū)北段單斜式低煤級煤層氣成藏地質(zhì)模型、中段基底上拱式中煤級煤層氣成藏地質(zhì)模型、南段邊緣推覆式高煤級煤層氣成藏地質(zhì)模型,典型代表區(qū)域分別在府谷、吳堡—柳林和韓城。其中,單斜式低煤級煤層氣成藏地質(zhì)模型中,煤層氣相對富集于地下水滯留區(qū)上部;在基底上拱式中煤級煤層氣成藏地質(zhì)模型中,煤層氣高滲富集區(qū)位于拉張型鼻狀隆起帶;在邊緣推覆式高煤級煤層氣成藏地質(zhì)模型中,氣體富集于擠壓型構(gòu)造轉(zhuǎn)折端。研究結(jié)果表明：吳堡—柳林基底上拱式中煤級煤層氣成藏地質(zhì)模型各成藏要素匹配良好,氣體儲(chǔ)集和滲流條件最好,建議作為優(yōu)先開發(fā)區(qū)域;府谷單斜式低煤級的含氣性相對差,滲透率高;韓城地區(qū)盡管氣體保存條件好,但邊淺部受邊緣逆沖推覆構(gòu)造的影響,煤體結(jié)構(gòu)破壞嚴(yán)重,煤層氣可采性差。

Abstr：With over 20 year history,although the CBM development succeeded in some areas in the eastern Ordos Basin,such as Baode,Liulin,etc.,the overall industrialization isn′t balanced.Besides the engineering factors,the divergence of the CBM geology still exists and the building of CBM reservoir model will help to select favorable areas.The Upper Paleozoic CBM reservoir geological model in the eastern Ordos Basin is established.By analyzing the tectonic dynamic condition,sequence stratigraphy,ground water dynamics condition and gas origin,three geological models of CBM reservoir-formation in the eastern Ordos Basin are constructed,including the monocline and low coal rank model,raised arch of the basements and medium coal rank model,and thrust and high coal rank model.The typical areas are Fugu,Wubao-Liulin and Hancheng.The relatively sweet block lies near the stagnant area of the ground water in the monocline and low coal rank model,the tensile nose-shaped uplifted zone in the raised arch of the basements and medium coal rank model,and the compressed tectonic regime in the thrust and high coal rank model.There is good matching to the key elements of CBM reservoir-formation dynamic system in the Wubao-Liulin,which is proposed as the preferred developmental areas in the eastern Ordos Basin,with the best gas storage capacity and permeability;in the monocline and low coal rank model in the Fugu,although the permeability is high,the gas content is low;in the thrust and high coal rank model in Hancheng,the preservation condition is excellent,however,influenced by the thrust belts,the coal structure is destroyed strongly,and the gas recovery declines.

文章關(guān)鍵詞：

Keyword：:Coalbed methane（CBM） Reservoir geological model Favorable areas Upper Paleozoic Ordos Basin

課題項(xiàng)目：國家重大科技專項(xiàng)（編號：2011ZX05040-003）資助

作者信息：會(huì)員可見

  本文關(guān)鍵詞：鄂爾多斯盆地東緣煤層氣成藏地質(zhì)模型，由筆耕文化傳播整理發(fā)布。