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1、石油勘探與開發(fā)2011年12月PETR0LEUMEXPL0RAT10NANDDEVELOPMENTVbl-38NO.6641文章編號:1000—0747(2011)06.0641.11四川盆地臺緣帶礁灘大氣區(qū)地質(zhì)特征與形成條件鄒才能,徐春春2,汪澤成,胡素云,楊光2,李軍,楊雨2,楊威(1.中國石油勘探開發(fā)研究院;2.中國石油西南油氣田公司;3.中國石油勘探開發(fā)研究院廊坊分院)基金項目:中國陸上大油氣區(qū)成藏理論與勘探技術(shù)攻關(guān)項目(113002KT0035)摘要:以四川盆地二疊系一三疊系長興組一飛仙關(guān)組臺緣
2、帶礁灘大氣區(qū)為例,闡述了臺緣礁灘體帶狀大氣區(qū)形成條件與地質(zhì)特征。四川盆地晚二疊世經(jīng)歷了克拉通內(nèi)裂陷作用和基底斷裂活動,在區(qū)域大緩坡背景下,形成了以城口一鄂西海、開江一梁平海槽及南充一綿陽臺內(nèi)洼地3個負(fù)向單元以及奉節(jié)一鎮(zhèn)巴臺坪、石柱一儀隴臺坪、遂寧一磨溪臺坪3個古地貌高點為特征的“三隆三凹”的古地理格局,臺坪向海槽過渡的高能帶環(huán)境發(fā)育大型臺緣帶礁灘體;經(jīng)歷早期溶蝕、回流滲透白云石化與埋藏溶蝕等建設(shè)性成巖作用,形成了沿臺緣帶分布的優(yōu)質(zhì)白云巖儲集層;臺緣帶礁灘體具有良好烴源條件,斷層發(fā)育,油氣成藏條件明顯優(yōu)于臺
3、內(nèi)礁灘體,臺緣帶控制天然氣富集,即大型臺緣古地理背景、規(guī)模白云巖溶蝕礁灘儲集層、良好的下生與側(cè)向氣源條件和帶狀集群展布的巖性、構(gòu)造及構(gòu)造一巖性復(fù)合3類圈閉“四要素”有機(jī)配置決定帶狀大氣區(qū)的形成與分布,展示了臺緣帶礁灘大油氣區(qū)的良好勘探前景。圖7表3參12關(guān)鍵詞:臺緣帶;礁灘大氣區(qū);成藏條件;白云巖儲集層;基底斷裂;四川盆地中圖分類號:P618.130.2;TE122文獻(xiàn)標(biāo)識碼:AGeologicalcharacteristicsandformingconditionsofthelargeplatformm
4、arginreef-shoalgasprovinceintheSichuanBasinZouCaineng,XuChunchun,WangZecheng,HuSuyun,YangGuang,LiJun,YangYu,YangWei(1.PetroChinaResearchInstituteofPetroleumExploration&Development,Beijing100083,China;2.PetroChinaSouthwestOilandGasFieldCompany,Chengdu61005
5、1,China;3.LangfangBranchofPetroChinaResearchInstituteofPetroleumExploration&Development,Langfang065007,China)Abstract:Thelargeplatformmarginreef-shoalgasprovinceofPermianChangxingFormationandTriassicFeixianguanFormationintheSichuanBasinisstudiedtodescribe
6、theformingconditionsandgeologicalcharacteristicsoflargestrip—likegasprovincesofplatformmarginreefsandshoals.TheSichuanBasinexperiencedcratonicriftingandbasementfaultingduringtheLatePermian.Withinawidespreadregionalramp,apaleogeomorphologypattemof‘‘threehi
7、ghsandthreedepressions”wereformed.Thethreenegativerelievesare,Chengkou—E’xisea,Kaijiang—Liangping~ough,andNanchong—Mianyangintraplatformdepression,andthethreetopographichighsareFengjie—Zhenbaplatformflat,Shizhu—Yilongplatformflat,andSuining—Moxiplatformfl
8、at.Inthetransitionalareasbetweenplatformflatsand~oughs,large-scaleplatformmarginreef-shoalcomplexesweredevelopedunderhighenergyenvironment.Diageneticprocesses,suchasearlystagesolution,seepage—refluxdolomitizationand