有机酸溶蚀作用对泥页岩储层孔隙结构的影响

为了解有机酸溶蚀作用下泥页岩常见矿物离子的溶出规律,探讨溶蚀作用对泥页岩次生孔隙结构的影响,针对南堡凹陷古近系沙三段泥页岩样品设计了不同温度、不同类型有机酸（乙酸、乙二酸）环境下的溶蚀实验。对实验后反应溶液进行等离子发射光谱检测,溶蚀后样品进行X衍射、扫描电镜、低温氮气吸附等测试。结果表明：随反应温度升高泥页岩中常见矿物离子在乙酸、乙二酸中的溶出可分为“上升、下降、复合、甚微型”以及“上升、下降、复合型”两种情况,且常见离子的“溶出系数”各异,总体上有机酸对泥页岩溶蚀作用正温效应明显,不同类型有机酸溶蚀机制差异显著;溶蚀后泥页岩的粒内孔孔径增大、数量增多,粒间孔接触部分发生小规模溶蚀产生网洞化...

Full description

Saved in:
Bibliographic Details
Published in中国石油大学学报（自然科学版） Vol. 41; no. 2; pp. 49 - 59
Main Author 罗瑞 查明 何皓 高长海 曲江秀 张勇 朱文慧 孙冲
Format Journal Article
LanguageChinese
Published 中国石油大学地球科学与技术学院,山东青岛,266580%中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒,841000 2017
Subjects
增孔效应
有机酸
泥页岩孔隙结构
溶蚀作用
离子释放
溶蚀作用
离子释放
dissolution
有机酸
增孔效应
porosity enhancement effect
ions release
organic acids
shale pore structure
泥页岩孔隙结构
Online AccessGet full text
ISSN1673-5005
DOI10.3969/j.issn.1673-5005.2017.02.006

Cover

More Information
Summary:为了解有机酸溶蚀作用下泥页岩常见矿物离子的溶出规律,探讨溶蚀作用对泥页岩次生孔隙结构的影响,针对南堡凹陷古近系沙三段泥页岩样品设计了不同温度、不同类型有机酸（乙酸、乙二酸）环境下的溶蚀实验。对实验后反应溶液进行等离子发射光谱检测,溶蚀后样品进行X衍射、扫描电镜、低温氮气吸附等测试。结果表明：随反应温度升高泥页岩中常见矿物离子在乙酸、乙二酸中的溶出可分为“上升、下降、复合、甚微型”以及“上升、下降、复合型”两种情况,且常见离子的“溶出系数”各异,总体上有机酸对泥页岩溶蚀作用正温效应明显,不同类型有机酸溶蚀机制差异显著;溶蚀后泥页岩的粒内孔孔径增大、数量增多,粒间孔接触部分发生小规模溶蚀产生网洞化现象,微裂缝宽度有所增大,并伴随伊利石、高岭石、蒙脱石等新生黏土矿物生成;乙酸溶蚀促进泥页岩中孔、微孔的生成从而增大其比表面积,乙二酸溶蚀则提升中孔、大孔比例,进而提高泥页岩平均孔径;有机酸溶蚀对泥页岩增孔效应初步判别显示其增孔能力有限,并未达到预期效果。
Bibliography:In order to know- the dissolution of common mineral ions in shale dissolved by organic acid,the impact of dissolu-tion on secondary pore structure of shale was investigated,in which the dissolution experiments were designed on shale sam-ples from the member 3 of Shahejie For^nation of Paleogene in Nanpu sag with different types of organic acids （acetic acid and oxalic acid） and different temperatures. The plasma-atomic emission spectrometry was conducted on the solution after the reaction. Also, the X-ray diffraction, scanning electron microscopy and low-temperature nitrogen adsorption analysis were conducted on dissolved samples. The results show that dissolution of common mineral ions in shale with increasing reaction temperature has two situations,which are ＂ increase, decrease, compound and little” by acetic acid, and “ increase,de-crease , compound冶 by oxalic acid respectively. And different ions show different dissolution coefficients. In general,the or-ganic acid dissolution of shale shows obvious posi
ISSN:1673-5005
DOI:10.3969/j.issn.1673-5005.2017.02.006