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龙马溪组黑色页岩在贵州、重庆等地广泛分布,是志留系生物地层研究和页岩气勘探的重要对象.本文针对黔渝地区从贵阳、遵义、桐梓、綦江至华蓥山这一由南向北的廊带,以其中生物地层研究程度较高的典型剖面为基础,总结出龙马溪组黑色笔石页岩的阶段性渐进展布模式.在横向上利用笔石带对比框架,将遵义至华蓥山划分为四个发育不同黑色页岩层段的廊带,并研究它们随时间展布的规律;同时,也较为准确地获得了龙马溪组黑色页岩与其上混合相地层和碳酸盐岩地层之间互相消长的相变过程.此外,本文还利用笔石深度分带的通用模式,论述了黔渝龙马溪组连续沉积的笔石页岩层段随时间其沉积水深不断加深的过程,从而将其划分为从LM1到LM5的海侵渐进阶段和LM5之后的均衡扩展阶段,在每一阶段龙马溪组黑色页岩的分布受控于不同的主导因素.这一阶段性渐进展布模式,对研究四川盆地南缘龙马溪组黑色页岩的时空分布具有重要的参考意义.
The black shale of Longmaxi Formation is widely distributed in Guizhou and Chongqing, and is an important object of Silurian biogenic stratigraphy and shale gas exploration.In this paper, from the aspects of Guiyang, Zunyi, Tongzi, Qijiang to Huaying Mountain From south to north of the corridor, based on the typical profiling of the biostratigraphy, the paper summarizes the gradual and progressive distribution pattern of the black penolith shale in the Longmaxi Formation.With the contrast of the pen-lithosphere frame, The Zunyi-Huaying Mountains are divided into four zones with different black shale intervals and the laws of their distribution over time are studied. At the same time, the black shale of Longmaxi Formation and its upper mixed phase strata and Carbonate rock strata .In addition, this paper also uses the common mode of pendeep depth zonation to discuss the continuous deepening of sedimentary water depth , So as to divide it into an advancing stage of transgression from LM1 to LM5 and an equilibrium expanding stage after LM5. At each stage, the distribution of black shale in Longmaxi Formation is controlled by different dominant factors. Distribution model, an important reference for the study of spatial and temporal southern margin of the Sichuan Basin Longmaxi black shale distribution.