四川盆地二三叠系礁滩相储层沉积演化特征
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摘要
四川盆地中西部二叠系—三叠系礁滩相储层具有广阔的勘探前景。通过大量钻井及地震层序划分对比,分析礁滩相储层赋存规律及层序发育特征,采用"优势相"编图方法,探讨礁滩相储层沉积演化规律。研究表明,四川盆地二、三叠礁滩相储层主要形成于海西晚期—印支早期构造旋回,为一个巨层序序列,处于裂陷盆地阶段;沉积演化经历盆地由西高东低转变为西低东高的格局,发生明显的翘倾;沉积体系经历了开阔台地—蒸发台地的转变。
Exploration practice illustrates that there is a huge prospect of Permian and Tertiary bioreef-shoal facies reservoirs in central and west Sichuan Basin.In this study,both drilling-and seismic-sequence are first classified and correlated;and then,the reservoirs’occurrence regularity and sequence-developed characteristics are analyzed;at last,the sedimentary-evolution law is discussed by means of a mapping method called dominant facies.Results demonstrate that:(1)the Permian and Tertiary bioreef-shoal facies reservoirs mainly formed in a structural cycle from late Hercynian to early Indochina,which is either a huge sequence succession or in a rifting basin stage;(2)the sedimentary evolution experienced a basinal framework from west-high-east-low to west-low-east-high,and an obvious tilting can be found;and(3) the sedimentary system also experienced a change from open platform to evaporate platform.
Exploration practice illustrates that there is a huge prospect of Permian and Tertiary bioreef-shoal facies reservoirs in central and west Sichuan Basin.In this study,both drilling-and seismic-sequence are first classified and correlated;and then,the reservoirs’occurrence regularity and sequence-developed characteristics are analyzed;at last,the sedimentary-evolution law is discussed by means of a mapping method called dominant facies.Results demonstrate that:(1)the Permian and Tertiary bioreef-shoal facies reservoirs mainly formed in a structural cycle from late Hercynian to early Indochina,which is either a huge sequence succession or in a rifting basin stage;(2)the sedimentary evolution experienced a basinal framework from west-high-east-low to west-low-east-high,and an obvious tilting can be found;and(3) the sedimentary system also experienced a change from open platform to evaporate platform.
引文
[1]郭正吾,邓康龄.四川盆地形成与演化[M].北京:地质出版社,1996.
[2]许效松,刘宝珺.上扬子西缘二叠系-三叠系层序地层与盆山转换耦合[M].北京:地质出版社,1997.
[3]汪泽成,赵文智,张林,等.四川盆地构造层序与天然气勘探[M].北京:地质出版社,2002.
[4]龙胜祥,增涛.四川盆地川东北地区P-T2天然气资源评价[J].石油实验地质,1996,18(02):155-160.
[5]罗启后,王世谦.四川盆地中西部三叠系重点含气层系天然气富集条件研究[J].天然气工业,1996,(16S1):40-54.
[6]李一平.四川盆地已知大中型气田成藏条件研究[J].天然气工业,1996,16(S1):1-12.
[2]许效松,刘宝珺.上扬子西缘二叠系-三叠系层序地层与盆山转换耦合[M].北京:地质出版社,1997.
[3]汪泽成,赵文智,张林,等.四川盆地构造层序与天然气勘探[M].北京:地质出版社,2002.
[4]龙胜祥,增涛.四川盆地川东北地区P-T2天然气资源评价[J].石油实验地质,1996,18(02):155-160.
[5]罗启后,王世谦.四川盆地中西部三叠系重点含气层系天然气富集条件研究[J].天然气工业,1996,(16S1):40-54.
[6]李一平.四川盆地已知大中型气田成藏条件研究[J].天然气工业,1996,16(S1):1-12.
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