四川旺苍双汇下二叠统茅口组眼球状石灰岩成因分析  

Genetic Analysis of Lower Permian Maokou Augen Limestone in Wangcang Area,Sichuan Basin

作　　者：刘杰[1] 李蔚洋[1] 何幼斌[2] 

机构地区：[1]江汉油田勘探开发研究院 [2]长江大学

出　　处：《海相油气地质》2011年第1期63-67,共5页Marine Origin Petroleum Geology

摘　　要：四川旺苍双汇眼球状石灰岩主要分布在下二叠统茅口组的下部、中部及顶部,累计厚度102.77m,占茅口组厚度的53.27%。眼球体（瘤体）为较纯的碳酸盐岩,占全岩的40%~50%;眼皮（基质）为泥质含量较高的碳酸盐岩,条带状绕瘤体分布。瘤体和基质的原始沉积物分别形成于开阔台地环境和局限台地环境;差异压实和差异压溶作用使层状的原始沉积物逐渐演化为眼球和眼皮结构。认为眼球状石灰岩的形成是沉积作用和成岩作用相综合的结果。Augen limestone develops in the lower,the middle and the top parts of Lower Permian Maokou Formation in Wangcang Area,Sichuan Basin.The total thickness of augen limestone is up to 102.77m,which accounts for 53.27% of the thickness of Maokou Formation.The knot-like augens,which are commonly 10~20cm in diameter,is composed of pure carbonate rock and is up to 40%～50% of the total thickness.The eyelids（matrix）,which are a carbonate rock with relatively high argillaceous content,are distributed as bands with thickness of 1～5cm around the augens.Genetic analysis shows that Primary sediments of augens and matrix formed respectively in an open platform environment and the limited platform and differential compaction and differential pressolution transformed these primal layered sediments into augens and eyelids.It is deemed that augen limestone is a product of both sedimentation and diagenesis.

关 键 词：眼球状石灰岩 岩石成因 沉积作用 成岩作用 茅口组 四川盆地 

分 类 号：TE112.23[石油与天然气工程—油气勘探]