CN101458217B - 一种求准碎屑岩填隙物中粘土矿物相对含量的方法 - Google Patents
一种求准碎屑岩填隙物中粘土矿物相对含量的方法 Download PDFInfo
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Abstract
本发明涉及一种求准碎屑岩填隙物中粘土矿物相对含量的方法,首先按石油天然气行业标准SY/T5368-2000的岩石薄片鉴定标准鉴定出砂岩粒间粘土矿物和塑性岩屑;按标准SY/T5163-1995沉积岩粘土矿物的相对含量分析出各粘土矿物相对百分含量;分别求出碎屑岩、填隙物、泥杂基的粘土矿物绝对百分含量,求出碎屑岩中塑性岩屑和泥杂基高岭石的绝对含量,分别求出高岭石占岩石粘土矿物总量和在填隙物中的相对含量,最后求出碎屑岩填隙物多出的粘土矿物相对含量,本方法能够求准碎屑岩填隙物中粘土矿物相对含量,正确评价储层敏感性特征。
Description
技术领域
本发明涉及一种用岩石薄片法校正直接用X射线衍射分析方法测定富含塑性岩屑(包括千枚岩、板岩、云母和水化、泥化的凝灰岩和熔岩岩屑、同生泥屑)的粘土矿物相对含量的求准碎屑岩填隙物中粘土矿物相对含量的方法。
背景技术
目前国内采用的沉积岩粘土矿物的相对含量分析方法,是以中华人民共和国石油天然气行业标准SY/T 5163-1995《沉积岩粘土矿物的相对含量X射线衍射分析方法》为背景技术。
该分析方法的缺点是,当砂岩分离粘土时,粉碎样品至小于5mm粒径。在这个过程中,那些成分以伊利石、伊蒙混层(I/S)、绿泥石和绿蒙混层组成的塑性岩屑来说,它们在砂岩粘土分析样品制备时,被粉碎、浸泡,在此过程中不可避免地被分散进入粘土组分中。那么塑性岩屑中的粘土矿物成分就和砂岩填隙物中的粘土矿物混在一起,直接影响储层填隙物粘土矿物的组成,使储层填隙物中的各类粘土矿物相对含量失真。因而直接使用沉积岩粘土矿物X衍射分析资料,导致不能正确评价储层敏感性特征。
发明内容
本发明的目的是用岩石薄片法校正直接用X射线衍射分析方法测定的粘土矿物的相对含量,求准碎屑岩填隙物中粘土矿物相对含量的方法,使粘土矿物分析结果准确,正确解释粘土矿物组合与潜在敏感性的关系,准确评价储层敏感性特征。
在使用《沉积岩粘土矿物相对含量X射线衍射分析》报告及评价储层敏感性时,必须考虑塑性岩屑对粘土矿物组成的影响,必须进行薄片、扫描电镜和X射线衍射分析三项资料的综合分析,用薄片法进行校正后才能使用。方法步骤:
(1)首先按中华人民共和国石油天然气行业标准SY/T5368-2000岩石薄片鉴定,分别鉴定出高岭石K、砂岩粒间粘土矿物或杂基E和塑性岩屑B的百分含量;
(2)按中华人民共和国石油天然气行业标准SY/T5163-1995沉积岩粘土矿物的相对含量X射线衍射分析方法分别分析出塑性岩屑和以邻近泥岩为代表的泥杂基的各类粘土矿物组成高岭石、伊利石、伊蒙混层、绿泥石和绿蒙混层相对百分含量;
以高岭石K1粘土矿物为例:
(3)求出砂岩包括塑性岩屑和泥杂基的所有粘土矿物的绝对百分含量A
A=K+E+B
(4)求出砂岩中塑性岩屑和杂基的百分含量A1
A1=E+B
(5)求出砂岩中高岭石和杂基百分含量B1
B1=K+E
(6)用公式X=X1×A1,求出塑性岩屑和以邻近泥岩为代表的泥杂基中高岭石K1的绝对含量G,公式中的X为塑性岩屑和以邻近泥岩为代表的泥杂基X衍射分析某种粘土矿物绝对含量,X1为塑性岩屑和以邻近泥岩为代表的泥杂基X衍射分析某种粘土矿物相对含量;
(7)求出高岭石(包括塑性岩屑和泥杂基)的所有粘土矿物占的百分含量的总和D
D=K+G
(8)求出高岭石占岩石粘土矿物总量的相对含量T
T=D/A
(9)求出高岭石在填隙物中的相对含量比R
R=D/B1
(10)用步骤(9)减去步骤(8)求出填隙物多出的高岭石相对含量H
H=R-T
上面方法中的百分含量全部是重量百分含量。
发明的效果
本方法能够求准碎屑岩填隙物中粘土矿物相对含量,正确评价储层敏感性特征。
具体实施方式
具体步骤:
(1)首先按中华人民共和国石油天然气行业标准SY/T5368-2000岩石薄片鉴定,分别鉴定出高岭石K=4%、砂岩粒间杂基粘土矿物E=1%和塑性岩屑B=5%的百分含量。
(2)按中华人民共和国石油天然气行业标准SY/T5163-1995沉积岩粘土矿物的相对含量X射线衍射分析方法分别分析出塑性岩屑和泥杂基(以邻近泥岩代表)粘土矿物组成高岭石、伊利石、绿蒙混层、伊蒙混层相对百分含量。
以高岭石K1=10%为例。
(3)求出砂岩(包括塑性岩屑和泥杂基)所有粘土矿物的百分含量A
A=K+E+B=4+5+1=10%
(4)求出砂岩中塑性岩屑和杂基的含量A1
A1=E+B=6%
(5)求出砂岩中高岭石和杂基百分含量B1
B1=K+E=5%
(6)用公式X=X1×A1,求出塑性岩屑和泥杂基(以邻近泥岩代表)中高岭石K1的绝对含量G。公式中的X为塑性岩屑和泥杂基(以邻近泥岩代表)X衍射分析某种粘土矿物(此处为高岭石)绝对含量,X1为塑性岩屑和泥杂基(以邻近泥岩代表)X衍射分析某种粘土矿物(此处为高岭石)相对含量
G=K1×A1=10%×6%=0.6%
(7)求出高岭石(包括塑性岩屑和泥杂基)的所有粘土矿物占的百分含量的总和D
D=K+G=4%+0.6%=4.6%
(8)求出高岭石占岩石粘土矿物总量的相对含量T
T=D/A×100%=4.6/10×100%=46%
(9)求出高岭石在填隙物中的相对含量R
R=D/B1×100%=4.6/5×100%=92%
(10)用步骤(9)减去步骤(8)求出填隙物多出的高岭石含量H
H=R-T=92%-46%=46%
上面发明方法中的百分含量全部是重量百分含量。
Claims (1)
1.一种求准碎屑岩填隙物中粘土矿物相对含量的方法,其特征在于:
(1)首先按中华人民共和国石油天然气行业标准SY/T5368-2000岩石薄片鉴定,分别鉴定出高岭石K、砂岩粒间粘土矿物或泥杂基E和塑性岩屑B的百分含量;
(2)按中华人民共和国石油天然气行业标准SY/T5163-1995沉积岩粘土矿物的相对含量X射线衍射分析方法分别分析出塑性岩屑B和以邻近泥岩为代表的泥杂基E的各类粘土矿物组成高岭石、伊利石、伊蒙混层、绿泥石和绿蒙混层相对百分含量;
高岭石粘土矿物的计算方式如下:
(3)求出砂岩包括塑性岩屑B和泥杂基E的所有粘土矿物的绝对百分含量A
A=K+E+B
(4)求出砂岩中塑性岩屑B和泥杂基E的百分含量A1
A1=E+B
(5)求出砂岩中高岭石K和泥杂基E百分含量B1
B1=K+E
(6)用公式X=X1×A1,求出塑性岩屑B和以邻近泥岩为代表的泥杂基E中高岭石K1的绝对含量G,公式中的X为塑性岩屑B和以邻近泥岩为代表的泥杂基EX衍射分析某种粘土矿物绝对含量,X1为塑性岩屑B和以邻近泥岩为代表的泥杂基EX衍射分析某种粘土矿物相对含量;
(7)求出高岭石K的包括塑性岩屑B和泥杂基E的所有粘土矿物占的百分含量的总和D
D=K+G
(8)求出高岭石占岩石粘土矿物总量的相对含量T
T=D/A
(9)求出高岭石在填隙物中的相对含量比R
R=D/B1
(10)用步骤(9)减去步骤(8)求出填隙物多出的高岭石相对含量H
H=R-T
上面方法中的百分含量全部是重量百分含量。
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CN103196930B (zh) * | 2013-03-08 | 2014-12-24 | 中国高岭土有限公司 | 一种针对特征峰重合的粘土矿物组分定量测算方法 |
CN104422706B (zh) * | 2013-08-30 | 2017-03-15 | 中国石油天然气股份有限公司 | 一种富含同生泥屑砂岩粘土矿物相对含量的检测方法 |
CN105527117A (zh) * | 2015-12-02 | 2016-04-27 | 成都理工大学 | 散粒体野外原位取样方法 |
CN109580679A (zh) * | 2017-09-29 | 2019-04-05 | 中国石油化工股份有限公司 | 基于岩石物理分析的粘土矿物类型及含量识别方法和系统 |
CN110057727B (zh) * | 2019-04-17 | 2021-08-31 | 中国石油大学(华东) | 一种针对砂砾岩储层中岩屑含量统计的方法 |
CN112557374A (zh) * | 2020-05-21 | 2021-03-26 | 中国石油天然气股份有限公司 | 定量预测碎屑岩储层胶结物含量的方法 |
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