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1、學(xué)兔兔www.xuetutu.com中國(guó)石油勘探第19卷第5期CHINAPETROLEUMEXPLORATION2014年9月DOI:10.3969/j.issn.1672-7703.2014.05.005庫(kù)車坳陷大北一克深礫石區(qū)地震攻關(guān)與天然氣勘探突破梁順軍雷開強(qiáng)王靜劉漢雄曾健張明柱王中海董同武(中國(guó)石油川慶鉆探工程有限公司地球物理勘探公司)摘要:庫(kù)車坳陷大北一克深礫石區(qū)廣泛發(fā)育第四系、新近系洪積扇,表層礫石層和深層礫巖層主要分布于扇根與扇中。表層礫石層巖性復(fù)雜,低(降)速層的厚度和速度變化大,導(dǎo)致地震資料信噪比低,應(yīng)用“寬線
2、+大組合”及“靜校正+多域去噪”采集處理技術(shù)聯(lián)合地震攻關(guān),有效提高了資料信噪比;而深層礫巖層致密,速度異常增高,速度陷阱大,嚴(yán)重影響構(gòu)造圈閉落實(shí)。根據(jù)地面露頭、鉆井和測(cè)井資料,解釋深層洪積扇地震相和沉積相,識(shí)別礫巖層與圍巖的接觸邊界,查明礫巖層厚度及其速度變化規(guī)律,有效地克服高速礫巖層對(duì)下伏構(gòu)造圈閉的影響。通過地震采集處理解釋一體化攻關(guān),落實(shí)和發(fā)現(xiàn)一大批優(yōu)質(zhì)鹽下白堊系構(gòu)造圈閉,多個(gè)圈閉及多口探井、評(píng)價(jià)井相繼獲得高產(chǎn)油氣流,氣田個(gè)數(shù)穩(wěn)健增長(zhǎng),油氣勘探獲得了重大發(fā)現(xiàn)和突破。關(guān)鍵詞:礫石區(qū);地震攻關(guān);信噪比;礫巖層特征;鹽下圈閉;白堊
3、系;油氣大發(fā)現(xiàn)中圖分類號(hào):P631.4文獻(xiàn)標(biāo)識(shí)碼:ASeismicResearchandNaturalGasExplorationBreakthroughinDB-KSGravelZoneinKuqaDepressionLiangShu~un,LeiKaiqiang,WangJing,LiuHanxiong,ZengJian,ZhangMingzhu,WangZhonghai,DongTongwu(SichuanGeophysicalCompanyofCNPCChuanqingDrillingEngineeringCompany
4、Limited)Abstract:TheQuaternaryandtheNeogenealluvialfandevelopedextensivelyinDabei—KeshengravelzoneofKuqadepression.Thesurfacegravellayerandde印conglomeratelayeraredistributedattherootofthefanandinthemiddleofthefanseparately.Thelithologiccharactersofthegravellayerareco
5、mplicatedwiththethicknessandvelocityvaryingsignificantly,leadingtoalowsignal-noiseratioofseismicdata.Themethodsof“widelineandlargeassemblage’’and“staticcorrectionandmulti—domainfiltering’’areusedinacquisitionandprocessingtoeffectivelyimprovethesignal-noiseratioofdata
6、.However,compactnessofthedeepconglomeratelayercausedthevelocitytoriseabnormally,seriouslyaffectingidentificationofstructuraltrap.Thesurfaceoutcropanddrillingandloggingdataareusedtointerprettheseismicfaciesandsedimentaryfaciesofthealluvialfan,identifytheboundarybetwee
7、ntheconglomeratelayerandenclosingrock,clarifythethicknessoftheconglomeratelayerandthelawforitsvelocityvariation,andeffectivelyeliminatetheimpactofthehigh—velocityconglomeratelayerontheunderlyingstructuraltraps.Basedontheeffortsfortheresearchonintegrationofseismicacqu
8、isition,processingandinterpretation,alargenumberofhigh-qualitysubsaltstructuraltrapsofCretaceouswereconfirmedanddiscovered.Thehigh—