天然气工业2017，Vol.37Issue(7)：20-26,7.DOI:10.3787/j.issn.1000-0976.2017.07.003
川南地区五峰组—龙马溪组页岩笔石带对比及沉积特征
Graptolite correlation and sedimentary characteristics of Wufeng-Longmaxi shale in southern Sichuan Basin
摘要
Abstract
The Changning and Weiyuan Blocks in southern Sichuan Basin are the main shale gas production areas in China,and their main shale gas pay zones are the organic rich shale of Upper Ordovician Wufeng Fm-Lower Silurian Longmaxi Fm,which are rich in organic shale with 20-40 m in thickness and with good correlatability.However,the organic-rich black shale in these blocks is significantly different in deposition time and rate if it is analyzed in terms of their graptolite strata.In this paper,core description and graptolite biostratigraphical classification were carried out on 8 wells in the Changning and Weiyuan Blocks by using sedimentology,biostratigraphy,geochemistry and mineralogy.It is indicated that the organic-rich shale in the Changning and Weiyuan Blocks is mainly deposited in WF1-LM4 and LM 1-LM8 graptolite zones,respectively,but their deposition time is obviously different;that the depocenter of the organic-rich shale migrated gradually northward (Weiyuan Block) under the influence of the Guangxi movement,and as it approaches the coast line in the south,the deposition of organic-rich shale ended earlier and that in the Weiyuan Block,the lower parts of Guanyinqiao Fm and parts of graptolite zones are locally missing and underwater paleouplifts (which might be above the sea surface during the Hirnantian Period) is developed,but its boundary has not been defined clearly,so the deposition of organic-rich shale is impacted,so much attention should be paid when shale gas exploration is deployed in this area.关键词
四川盆地/长宁区块/威远区块/晚奥陶世—早志留世/页岩气/笔石/对比/古隆起/沉积演化Key words
Sichuan Basin/Changning Block/Weiyuan Block/Late Ordovician-Early Silurian/Shale gas/Graptolite/Correlation/Paleouplift/Sedimentary evolution引用本文复制引用
梁峰,雷治安,王红岩,拜文华,郭伟,赵群,孙莎莎,张琴,武瑾,马超..川南地区五峰组—龙马溪组页岩笔石带对比及沉积特征[J].天然气工业,2017,37(7):20-26,7.基金项目
国家科技重大专项(编号:2017ZX05035)、国家重点基础研究发展计划(973计划)项目(编号:2013CB228001). （编号:2017ZX05035）
