库车坳陷大北克深砾石区地震攻关与天然气勘探突破

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1、学兔兔www.xuetutu.com中国石油勘探第19卷第5期CHINAPETROLEUMEXPLORATION2014年9月DOI：10．3969／j．issn．1672-7703．2014．05．005库车坳陷大北一克深砾石区地震攻关与天然气勘探突破梁顺军雷开强王静刘汉雄曾健张明柱王中海董同武(中国石油川庆钻探工程有限公司地球物理勘探公司)摘要：库车坳陷大北一克深砾石区广泛发育第四系、新近系洪积扇，表层砾石层和深层砾岩层主要分布于扇根与扇中。表层砾石层岩性复杂，低(降)速层的厚度和速度变化大，导致地震资料信噪比低，应用“宽线

2、+大组合”及“静校正+多域去噪”采集处理技术联合地震攻关，有效提高了资料信噪比；而深层砾岩层致密，速度异常增高，速度陷阱大，严重影响构造圈闭落实。根据地面露头、钻井和测井资料，解释深层洪积扇地震相和沉积相，识别砾岩层与围岩的接触边界，查明砾岩层厚度及其速度变化规律，有效地克服高速砾岩层对下伏构造圈闭的影响。通过地震采集处理解释一体化攻关，落实和发现一大批优质盐下白垩系构造圈闭，多个圈闭及多口探井、评价井相继获得高产油气流，气田个数稳健增长，油气勘探获得了重大发现和突破。关键词：砾石区；地震攻关；信噪比；砾岩层特征；盐下圈闭；白垩

3、系；油气大发现中图分类号：P631．4文献标识码：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—