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| 川西南犍为地区下三叠统嘉陵江组沉积相及其演化特征 | |
| 引用本文： | 曹剑,谭秀成,陈景山.川西南犍为地区下三叠统嘉陵江组沉积相及其演化特征[J].高校地质学报,2004,10(3):429-439. |
| 作者姓名： | 曹剑 谭秀成 陈景山 |
| 作者单位： | 1. 南京大学,地球科学系,江苏,南京,210093 2. 西南石油学院,资源与环境学院,四川,南充,637001;成都理工大学,地球科学系,四川,成都,610059 3. 西南石油学院,资源与环境学院,四川,南充,637001 |
| 摘 要： | 以岩心精细描述、薄片鉴定和测井曲线分析为基础，通过对川西南犍为地区嘉陵江组的岩石类型组合、古生物化石、沉积结构、沉积构造和沉积序列等沉积相标志的详细研究，结合区域沉积背景，认为犍为地区嘉陵江组为半局限海-局限海台地沉积，进一步识别出混积潮坪、潮缘滩、半局限泻湖、局限泻湖和蒸发潮坪等5种沉积亚相类型；在此基础上，通过连井沉积相横剖面对比和重点层段沉积相平面分布特征的研究，揭示出嘉陵江组的沉积相演化规律由下至上从混积潮缘到潮下低能，再到潮上蒸发环境，构成一个完整的海进一海退发展旋回；其中的潮缘滩相颗粒岩和潮坪相云岩可成为有利的油气储集相带。 |
| 关 键 词： | 沉积相 嘉陵江组 下三叠统 犍为地区 四川盆地 |
| 文章编号： | 1007-7493(2004)03-429-11 |
| 修稿时间： | 2003年10月23 |
Sedimentary facies and their evolution characteristics in Jialingjiang Formation of Qianwei area,Southwest Sichuan Basin |
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| CAO Jian,TAN Xiu-cheng.Sedimentary facies and their evolution characteristics in Jialingjiang Formation of Qianwei area,Southwest Sichuan Basin[J].Geological Journal of China Universities,2004,10(3):429-439. | |
| Authors: | CAO Jian TAN Xiu-cheng |
| Institution: | CAO Jian~1,TAN Xiu-cheng~ |
| Abstract: | Based on sophisticated observations on cores, thin sections and analysis on logging curves, combined with through study on sedimentary characteristics, such as lithologic types and associations, palaeobiologic fossils and textures, sedimentary structures, and considering regional sedimentary background, it is recognized that Jialingjiang Formation in Qianwei area is characterized by semi-restricted to restricted marine platform deposits.Five sedimentary subfacies could be subdivided: the mixing tidal flat subfacies, the peritidal bank subfacies, the semi-restricted subfacies, the restricted lagoon subfacies, and the evaporate tidal flat subfacies. With the above results, and through the study on facies correlation of three well sections and facies distribution of three key reservoir formations, it is pointed out that the sedimentary environment evolution of Jialingjiang Formation from the botteom upwards is from mixing deposit, Through subtidal deposit with low energy, to supratidal evaporate deposit. This history formed a complete developing cycle from marine transgression to regression. It is quite possible that the peritidal bank subfacies with grain rock type and evaporate tidal flat subfacies with dolomite rock type could be favorable reservoir layers. |
| Keywords: | sedimentary facies Jialingjiang Formation Lower Triassic Qianwei area Sichuan Basin |
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