沉积与特提斯地质
沉積與特提斯地質
침적여특제사지질
SEDIMENTARY GEOLOGY AND TETHYAN GEOLOGY
2014年
4期
75-79
,共5页
张凯淞%杨瑞召%姜喆%闫立志
張凱淞%楊瑞召%薑喆%閆立誌
장개송%양서소%강철%염립지
高精度三维地震数据采集%观测系统%激发%功率谱面积%频带宽度
高精度三維地震數據採集%觀測繫統%激髮%功率譜麵積%頻帶寬度
고정도삼유지진수거채집%관측계통%격발%공솔보면적%빈대관도
high-precision 3 D seismic data acquisition%observation system%excitation%power spectrum area%bandwidth
鄂尔多斯盆地北部TBM探区表层地震地质条件较为复杂,低降速层主要为流沙、含水沙层及黄土层,厚度横向变化较大,潜水面变化不定。储层非均质性强,有效储层薄,储层与煤层伴生,严重制约了本区天然气勘探开发步伐。为了解决目前勘探开发所面临的实际问题,在TBM探区部署并实施了100km2的高精度三维地震数据采集,针对探区的地震地质特点和难点,开展了攻关和试验。在高精度三维地震数据采集中,通过观测系统优化、虚反射界面分析和利用、激发岩性优选、试验资料功率谱面积和频宽收敛分析等技术的综合运用,确定了合适的三维观测系统和激发因素,取得了较好的效果。
鄂爾多斯盆地北部TBM探區錶層地震地質條件較為複雜,低降速層主要為流沙、含水沙層及黃土層,厚度橫嚮變化較大,潛水麵變化不定。儲層非均質性彊,有效儲層薄,儲層與煤層伴生,嚴重製約瞭本區天然氣勘探開髮步伐。為瞭解決目前勘探開髮所麵臨的實際問題,在TBM探區部署併實施瞭100km2的高精度三維地震數據採集,針對探區的地震地質特點和難點,開展瞭攻關和試驗。在高精度三維地震數據採集中,通過觀測繫統優化、虛反射界麵分析和利用、激髮巖性優選、試驗資料功率譜麵積和頻寬收斂分析等技術的綜閤運用,確定瞭閤適的三維觀測繫統和激髮因素,取得瞭較好的效果。
악이다사분지북부TBM탐구표층지진지질조건교위복잡,저강속층주요위류사、함수사층급황토층,후도횡향변화교대,잠수면변화불정。저층비균질성강,유효저층박,저층여매층반생,엄중제약료본구천연기감탐개발보벌。위료해결목전감탐개발소면림적실제문제,재TBM탐구부서병실시료100km2적고정도삼유지진수거채집,침대탐구적지진지질특점화난점,개전료공관화시험。재고정도삼유지진수거채집중,통과관측계통우화、허반사계면분석화이용、격발암성우선、시험자료공솔보면적화빈관수렴분석등기술적종합운용,학정료합괄적삼유관측계통화격발인소,취득료교호적효과。
The TBM exploration area lies in the northern part of the Ordos Basin,where the low velocity layers are laterally discontimuous,and dominantly made up of drifting sand,water sand and loess layers. The water tables are variable,and the hydrocarbon reservoirs are highly heterogeneous and associated with coal seams. The high-precision 3D seismic exploration is carried out in the area of 100 km2 of the TBM exploration area. The emphasis in the high-precision 3D seismic data acquisition is placed upon the optimization of 3D observation systems,analysis and use of virtual reflection interfaces,selection of excitation lithology,convergence measurements of the power spectrum areas and bandwidths in order to determine appropriate 3D observation systems and excitation factors.