四川盆地东南部震旦系灯影组四段台缘带天然气勘探前景  

Natural Gas Exploration Prospect of the Platform Marginal Zone of the Fourth Member of Sinian Dengying Formation in Southeastern Sichuan Basin

作　　者：孙自明 卞昌蓉[1] 张荣强[1] 孙炜[1] 武重阳 林娟华[1] SUN Ziming;BIAN Changrong;ZHANG Rongqiang;SUN Wei;WU Chongyang;LIN Juanhua(SINOPEC Perroleum Exploration and Producion Research Instilute Beijing 102206,China)

机构地区：[1]中国石化石油勘探开发研究院,北京102206

出　　处：《现代地质》2022年第4期979-987,共9页Geoscience

基　　金：中国科学院战略性先导科技专项(A类)“深层油气富集规律与战略选区”(XDA14010406)。

摘　　要：四川盆地绵阳-长宁拉张槽两侧震旦系灯影组台缘带是重要的天然气勘探领域,自川中古隆起核部拉张槽东侧灯影组台缘带发现安岳气田以来,处于古隆起南、北两侧深层-超深层斜坡和深洼陷区的灯影组台缘带日益受到关注,但对其发育特征尤其川中古隆起南侧灯影组四段台缘带的发育特征和油气成藏条件等缺乏清晰的认识。基于此,充分利用最新地震和钻井等资料,选择四川盆地东南部绵阳-长宁拉张槽东侧灯影组四段台缘带进行了重点研究。结果表明,该区灯影组四段台缘带平面展布方向自南向北从北东向转为北北西向,剖面上与川中古隆起及其北斜坡至深洼区的陡坡型台缘带差异显著,以缓坡型台缘带为特征;该区油气成藏条件优越,发育陡山沱组、灯三段和筇竹寺组3套烃源岩,储层品质良好,发育系列由台缘丘滩体构成的岩性圈闭,空间上存在“下生上储、旁生侧储和上生下储”等多种源储配置样式,具有近源优储的显著特点,且保存条件好,勘探前景好。The platform marginal zone of the Sinian Dengying Formation on both sides of Mianyang-Changning extensional trough isan important exploration target for natural gas in Sichuan Basin.Since Anyue natural gas field,located in the platform marginal zone of Dengying Formation on the eastern side of the extensional trough,was discovered at the core of central Sichuan paleo-uplift,more and more attention has been paid to the deep to ultra-deep platform marginal zone of Dengying Formation on the south and north side of the paleo-uplift However,it is unclear about its distribution,geometrical features and hydrocarbon accumulation conditionsofthe platform marginal zone of Dengying Formation and exploration potential especially in southeastern Sichuan Basin.Therefore,the platform marginal zone of the fourth member of Dengying Formation in the southern slope of central Sichuan paleo-uplift and its adjacent depression was systematically studied by using the latest seismicand drilling data in southeastern Sichuan Basin It was shown that the distribution direction of the platform marginal zone of the fourth member of the Dengying Formation extends from NE to NNW from south to north,and shows the characteristics of gentle slope platform marginal zone which is significantly different from those in the central Sichuan paleo-uplift and its northern slope to depression There exist three sets of source rocks developed in the Sinian Doushantuo Formation the third member of Dengying Formation and the Cambrian Qiongzhusi Formation,which laid the sound resource basis for large and medium-sized oil and gas fields Reservoir has a good quality.The traps are mainly lithologic traps,developed in large numbers,and have good self-sealing characteristics in the updip direction There are three kinds of accumulation assemblages of“lower generation and upper reservoir,side generation and side reservoir,and upper generation and lower reservoir”Two sets of regional cap rocks,Qiongzhusi Formation shale and Middle-Lower Cambrian gypsum rock,provide

关 键 词：缓坡型台缘带 勘探前景 灯影组四段 震旦系:四川盆地东南部 

分 类 号：TE122[石油与天然气工程—油气勘探]