预览加载中，请您耐心等待几秒...

京津凹陷沙河街组三段地震相分析及油气聚集.docx

预览
1/2
2/2

在线预览结束，喜欢就下载吧，查找使用更方便

下载提示 文本预览

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

京津凹陷沙河街组三段地震相分析及油气聚集 Abstract BasedonthedetailedanalysisofseismicsectioninShaheFormationIII,JingjinDepression,itisfoundthatthereareabundantreflectioncharacteristicsofnaturalgasinthesection,whicharemainlydistributedinthelowfrequencyband.Combinedwiththeregionalgeologicalbackgroundandrelevantgeologicaldata,itisinferredthatthenaturalgasismainlyderivedfromtheLowerPaleozoicstrata.Byusingseismicattributessuchasamplitude,frequencyandenergy,severalpotentialgasreservoirexplorationtargetsareidentifiedinthestudyarea.Therefore,itisofgreatsignificancetofurtherexplorethenaturalgasresourcesintheJingjinDepression. Introduction TheJingjinDepressionislocatedintheintersectionofBeijing,TianjinandHebeiProvince,coveringanareaofabout15000km2.ItisoneofChina'slargestoilandgasproducingareas,andtheShahejieFormationisthemainoilandgasbearingstratainthedepression.Inrecentyears,withtheexplorationanddevelopmentofthedeepreservoirs,thepotentialofunconventionaloilandgasresourcesinthedepressionhasbeenpaidmoreattention. TheShahejieFormationintheJingjinDepressionconsistsofthreemembers,namely,theShahejieFormationI,IIandIII.Amongthem,theShahejieFormationIIIisthemainexplorationtargetofnaturalgasinthedepression.ThispapertakestheShahejieFormationIIIofthestudyareaastheresearchobject,andanalyzestheseismicsectioncharacteristicsandoilandgasaccumulationconditionsbasedonthedataobtainedfromseismicdataacquisition. AnalysisonSeismicSectionCharacteristics InordertostudytheseismicsectioncharacteristicsoftheShahejieFormationIII,weobtainedandprocessedthe3Dseismicdatainthestudyarea.TheresultsshowthattheseismicwaveimpedanceoftheShahejieFormationIIIissignificantlydifferentfromthatoftheunderlyingrockformations,whichmakesthereflectionofseismicwaveschangeobviously.Theseismicwaveformiscomplexandthereflectionenergyisstrong,indicatingthattheformationhasgoodlithologyandthicknesscontinuity. Inaddition,weusespectraldecompositiontechnologytoanalyzethefrequencybandofseismicdata.TheresultsshowthatinthemiddleandlowerpartoftheShahejieForm