下扬子地区下寒武统荷塘组泥页岩层序演化及其对气源潜力的控制:以杨树岭剖面为例  

Sequences Stratigraphic Evolution and Its Controlling Significance on the Shale Gas Generation Potential of the Early Cambrian Hetang Formation Black Shales in the Lower Yangtze Area :Case Study of Yangshuling Section

作　　者：刘占红[1] 

机构地区：[1]中国地质大学构造与油气资源教育部重点实验室,武汉430074

出　　处：《地质科技情报》2013年第6期95-102,115,共9页Geological Science and Technology Information

基　　金：国家青年自然科学基金项目(41202087);中央高校基金项目(CUGL120253)

摘　　要：下寒武统荷塘组(黄柏岭组)是下扬子地区重要的页岩气勘探层位之一,主要为一套沉积于斜坡-陆棚-盆地相的灰黑色泥岩、碳质页岩、硅质页岩及硅质岩。以杨树岭剖面为研究对象,通过系统的野外观察、剖面实测及室内样品测试分析工作,对下扬子地区的这套泥页岩开展了系统的综合层序地层学研究,对其体系域构成和沉积演化进行了精细划分,并将其划分结果与泥页岩的气源潜力进行了对比分析。研究发现,在层序格架中,层序演化的不同阶段对泥页岩的气源潜力具有重要的控制作用,尤其在层序演化凝缩段沉积的泥页岩具有最优的页岩气气源潜力,反映了开展层序地层格架研究对页岩气资源的勘探工作具有重要的预测作用和指导意义。The Early Cambrian Hetang Formation black shales is one of the important horizon in shale gas exploration in the lower Yangtze area and mainly deposited in slope-shelf-basin facies, and consisted of bat- tie, siliceous shale, silicalite etc. The systematic sequences stratigraphic division, sequence stratigraphic architecture, system tract constitution, and depositional facies evolution are thoroughly investigated by systmatical analyzing outcrop and collected samples. Furthermore, The effect of sequences controlling on the gas-generation potential is discovered according to the contrast relationship between the sequences evo- lution, architecture and the gas-generation potential. The results showed that the black shales deposited in the condensed section are optimum gas-generation potential. The distribution of gas--bearing shales is pre- dictable through the sequence stratigraphy study.

关 键 词：下扬子地区 下寒武统 泥页岩 层序格架 气源潜力 

分 类 号：TE121.3[石油与天然气工程—油气勘探]