四川盆地及周边上奥陶统五峰组观音桥段岩相特征及对页岩气选区意义

发布时间：2018-01-14 06:25

本文关键词：四川盆地及周边上奥陶统五峰组观音桥段岩相特征及对页岩气选区意义　出处：《石油勘探与开发》2016年01期 　论文类型：期刊论文

【摘要】：以钻井和露头资料为基础,依据岩石矿物、地球化学和测井数据,对四川盆地及周边上奥陶统五峰组观音桥段地层分布和岩相特征开展研究。观音桥段地层分布总体受海平面变化控制,与上下围岩接触关系区域变化大,在盆地内呈整合接触,在盆地外存在整合接触区和缺失区;在盆地内一般为深水硅质页岩相和钙质硅质页岩相,岩性与上下围岩基本相似,在盆地外主体为浅水泥灰岩相或缺失区,且在盆地外泥灰岩相整合接触区,岩性与围岩差异大。研究证实:观音桥段岩相是判断五峰组—龙马溪组页岩气储集层质量优劣的重要标志,对页岩气选区具有重要地质意义;川南—川东—川东北坳陷区为优质储集层发育区和页岩气勘探开发的有利区,观音桥段缺失区为"甜点"层缺失和页岩气勘探风险区,观音桥段泥灰岩相区的储集层质量和勘探前景则界于前两者之间。
[Abstract]:Based on drilling and outcrop data, rock minerals, geochemistry and logging data are used. The stratigraphic distribution and lithofacies characteristics of Guanyinqiao section of upper Ordovician Wufeng formation in Sichuan Basin and its surrounding area are studied. The stratigraphic distribution of Guanyinqiao section is generally controlled by sea level change and the regional change of contact relationship with upper and lower surrounding rock is great. There are integrated contact areas and missing areas outside the basin. In the basin, there are generally deep water siliceous shale facies and calcareous siliceous shale facies. The lithology is basically similar to that of the upper and lower wall rocks, and the main body outside the basin is the shallow cement limestone facies or missing area, and the shallow-cement limestone facies is integrated into the contact area outside the basin. The study proves that the lithofacies of Guanyinqiao formation is an important indicator to judge the quality of shale gas reservoir of Wufeng formation and Longmaxi formation, and has important geological significance to the selection of shale gas. The south Sichuan east Sichuan north Sichuan depression area is the favorable area for high quality reservoir development and shale gas exploration and development. The missing area of Guanyin Bridge section is the desserts and shale gas exploration risk area. The reservoir quality and exploration prospect in the mudstone facies area of Guanyin Bridge are between the former and the other.
【作者单位】：中国石油勘探开发研究院;
【基金】：国家重点基础研究发展计划(973)项目(2013CB228001) 国家页岩气重大专项(2011ZX05018-001)
【分类号】：P618.13
【正文快照】： 0引言四川盆地及周边上奥陶统五峰组(O3w)、下志留统龙马溪组(S1l)页岩已成为中国页岩气勘探开发主力层系[1-3],两层之间为五峰组观音桥段(O3g),产丰富的Hirnantia sagittifera,Eostropheodonta parvicostellataRong等赫南特期腕足类化石,是赫南特期冰期形成的一套区域分布的

【参考文献】