【摘要】 鄂尔多斯盆地西南部地区天然气勘探程度较低,2004年ZT1井在山西组山1段试气获工业气流,揭示上古生界具备良好的勘探前景.上古生界天然气成藏特征研究表明,二叠系发育西南物源石英砂岩储集体,主要含气层系是山西组山1段、石盒子组盒8段,砂体厚度相对较薄,埋深超过4000m.区内储层普遍致密,局部发育相对高渗层段,与煤系烃源岩配置良好,是形成致密砂岩气藏的有利区带.本文应用地震勘探攻关成果,建立主力砂体地震响应模式,进一步落实了山1、盒8砂体的展布,结合探井钻探效果,优选了有利钻探目标.在试气方法上引入体积压裂理念,QT1井试气获工业气流,勘探取得新突破.对研究区天然气成藏条件的分析、主力砂体地震预测模式及试气工艺等成功经验的总结,对该区天然气勘探的深入开展具有重要的指导意义.更多还原

【Abstract】 The degree of gas exploration in the southwest Ordos basin is relatively low,however,In 2004,the commercial gas flow in well ZT1 tested in Shan1 segment of Shanxi Formation shows that the Upper Paleozoic gas exploration potential is pretty good.Analysis of Upper Paleozoic gas reservoir-forming was made,it is indicated that upper Paleozoic Permian developed southwestern provenance quartz sandstones reservoir body,and main gas bearing formations are Shan1 segment of Shanxi Formation and He8 segment of Shihezi Formation.The thickness of sand body is relatively thin,and whose buried depth beyond 4000m.Gas reservoirs are generally tight in the area,which locally develop high-permeability segments,and match well with coal-bearing source rock,which is the favorable zone for forming tight sandstone gas reservoirs.Based on recent years seismic prospecting achievements,we build the sand body seismic response modeling,the distribution of He8 and Shan1 sand body is determined and favorable drilling target is optimized.Introducing volume fracturing idea in gas well-testing technique,the commercial gas flow in well QT1 tested,gas exploration has achieved new breakthrough.Analysis on gas reservoir-forming,sand body seismic response modeling and experiences of well-tseting technique has guiding significance for gas exploration further developing in the area.更多还原