简介:High-qualityseismicgeometryisthekeytoobtainhigh-qualityseismicdata,andcanaffecttheaccuracyofdataprocessingandimaging.Basedontheanalysisoftherelationshipbetweenthequalityofthegeometryandthefouracquisitionparameters(thenumberoftraces,shotlinespacing,andthespaceandnumberofreceiverlines),aqualityevaluationmethodofthegeometrybasedoncomprehensivequalityfactor(CQF)isproposed,andtherelationshipbetweenthegeometryqualityandthefourparametersisgiven.WeusefielddatacollectedinanoilfieldinWesternChinawithcomplexgeology:Firstweuseawideazimuthgeometry.Then,wecalculatetherelationshipcurvebetweengeometryanddataqualitybyvaryingeachparameterwhilekeepingtherestfixed.andtheanalysisresultsaregivenbyusingtheCQFevaluationmethod.Theresultsshowthattheshot-linespacinghasthegreatesteffectonthequalityofthegeometry,andtheincreaseofthereceiverlinespacingcanappropriatelyimprovethequalityofthegeometry,andtheincreaseofthenumberofreceivingtracescanimprovethegeometryquality.Thedifferentacquisitionparametershavedifferenteffectsontheimagingqualityofshallowanddeepevents.Themodelforwardandprestackdepthmigrationareusedtogenerateprestackdepthmigrationprofileswithdifferentacquisitionparameters.Theimagingresultsareconsistentwiththeabovecalculatedresults.Accordingtothedepthofthetargetlayer,thequalityfactorevaluationmethodisappliedtoguidethedesignofthegeometryandoptimizetheacquisitionparameterstoimprovetheimagingaccuracyofseismicdata.
简介:摘要本文从地震预测入手,我们应科学的、全面的、充分的从地震预测实践中针对相关的资料与经验进行深层次的加工与提炼,探索地震孕育、发生的客观规律,相信未来必然能够实现地震预测的科学目标。
简介:摘要地质构造是诱导水害、瓦斯灾害的主要因素,水害是煤矿生产中比较常见的事故,这类事故突发性强,对矿井危害严重,水灾的发生可以在极短的时间内给矿井造成毁灭性的灾难。在有些生产矿井的范围内,常常有许多充水的小窑老空、构造以及富含水层。当采掘工作面接近这些水体时,就有可能造成地下水突然涌入巷道,造成矿井事故。为了消除这些隐患,在生产中使用物探的方法,探明工作面前方的水情,然后将水有控制的放出,以保证采掘工作的安全。物探技术是一种集地质学、物理学、数学、计算机等多学科于一体的边缘性学科,物探方法技术具有快速、连续施测的优点,且成本较低的特征,结合我矿的实际情况,认真组织实施物探工作,在我矿采掘能够顺利安全通过水害威胁和采空区等特殊地段、避免地质灾害起到了一定的作用。