四川盆地东缘湘西北地区牛蹄塘组页岩储层特征及影响因素

发布时间：2018-04-04 04:10

本文选题：页岩　切入点：储层　出处：《石油与天然气地质》2017年05期

【摘要】：四川盆地东缘湘西北地区牛蹄塘组具有分布广、厚度大、埋藏适中、有机质丰度高以及热演化程度高等特点,资源前景广阔,是近年来南方页岩气勘探重点。文章以该区参数井——花页1井为研究对象,通过岩心、岩屑观察,采用薄片鉴定、X-衍射矿物分析、物性测试、扫描电镜、低温氮气吸/脱附实验等系统手段,研究储层特征,综合分析储层的影响因素。在深水陆棚相,牛蹄塘组发育黑色炭质页岩、硅质页岩,以富含炭质、硅质及黄铁矿,低黏土矿物(伊利石为主)含量为特征,页岩属特低孔、特低渗类型储层。SEM和低温氮气吸/脱附实验表明,储层主要发育圆筒孔(有机质孔)、狭窄平行板孔(粘土矿物层间孔)、四面开口的锥形管孔(粘土矿物粒间孔)以及锥形平板孔(微裂缝);中孔(2~50 nm)提供了平均60.3%的BJH体积。多种因素共同影响微观孔隙发育:深水泥质陆棚控制了孔隙发育物质基础;丰富TOC促进有机质孔(尤其是大孔)发育;矿物组成及含量控制了孔隙发育类型及程度;有机质热演化作用促进有机质孔、微裂缝发育。
[Abstract]:The Niulitang formation in the northwest of Hunan Province on the eastern margin of Sichuan Basin has the characteristics of wide distribution, large thickness, moderate burial, high organic matter abundance and high thermal evolution, and has a broad prospect of resources, which is the focus of shale gas exploration in the South in recent years.This paper studies reservoir characteristics by means of core and cuttings observation, X-ray diffraction mineral analysis, physical property test, scanning electron microscope, low temperature nitrogen absorption / desorption experiment and so on.Comprehensive analysis of reservoir impact factors.Black carbonaceous shale and siliceous shale are developed in the deep shelf facies. They are characterized by rich in carbon, siliceous, pyrite and low clay minerals (mainly Illite).The results of ultra-low permeability reservoir. SEM and low temperature nitrogen absorption / desorption experiments show that,The reservoir mainly develops cylindrical pore (organic matter pore, narrow parallel plate pore (clay mineral interlayer pore), conical tube hole with four openings (clay mineral intergranular pore) and conical flat hole (microfracture; mesoporous pore, 250nm), which provides an average BJH volume of 60.3%.The micropore development is influenced by many factors: deep water muddy shelf controls pore development material foundation, rich TOC promotes organic pore (especially macropore) development, mineral composition and content control pore development type and degree;The thermal evolution of organic matter promotes the development of pore and microfracture of organic matter.
【作者单位】：中南大学地球科学与信息物理学院;湖南省煤炭地质勘查院;湖南科技大学页岩气资源利用湖南省重点实验室;
【基金】：国家自然科学基金项目(41603046) 湖南省科学技术厅软科学计划项目(2014ZK3043) 湖南省国土资源厅软科学研究项目(2014-01) 湖南科技大学页岩气资源利用湖南省重点实验室开放基金资助项目(E21642)
【分类号】：P618.13

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