有机酸溶蚀作用对泥页岩储层孔隙结构的影响

发布时间：2018-01-14 17:30

本文关键词：有机酸溶蚀作用对泥页岩储层孔隙结构的影响　出处：《中国石油大学学报(自然科学版)》2017年02期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:In order to understand the dissolution rule of common mineral ions in shale under organic acid dissolution, the effect of dissolution on the secondary pore structure of shale is discussed. The dissolution experiments of shale samples from the third member of the Paleogene Sha 3 in Nanpu Sag were carried out at different temperatures and different types of organic acids (acetic acid and adipic acid). Plasma emission spectrometry was used to detect the reaction solution after the experiment. X-ray diffraction (XRD), scanning electron microscopy (SEM) and nitrogen adsorption at low temperature were used to test the dissolved samples. The results showed that the dissolution of common mineral ions in shale shale could be divided into "rising and decreasing" with increasing reaction temperature in acetic acid and adipic acid. Complex, very micro "and" rise, decrease, compound "two kinds of cases, and the common ions of the" dissolution coefficient "is different, overall organic acids to mud shale dissolution effect is obvious positive temperature effect. The dissolution mechanism of different types of organic acids was significantly different. After dissolution, the pore size of shale increases, the number increases, the intergranular pore contact part occurs small scale dissolution to produce mesh cavitation phenomenon, the microfracture width increases, and accompanied by Illite and kaolinite. Formation of new clay minerals such as montmorillonite; Acetic acid solution promotes the formation of mesopore in shale, and the formation of micropores increases its specific surface area, while the ratio of mesopore and macropore is increased by acetic acid dissolution, thus increasing the average pore size of shale. The preliminary discrimination of pore increasing effect of organic acid solution on shale shows that its pore increasing ability is limited, and it does not reach the expected effect.
【作者单位】：中国石油大学地球科学与技术学院;中国石油塔里木油田分公司勘探开发研究院;
【基金】：国家“973”计划项目(2014CB239005) 国家重大科技专项(2011ZX05001-001-006) 山东省自然科学基金项目(ZR2013DM016)
【分类号】：P618.13
【正文快照】： (1.School of Geosciences in China University of Petroleum,Qingdao 266580,China;2.Research Institute of Exploration and Development,Tarim Oilfield Company,Petro China,Korle 841000,China)泥页岩储层具有超低孔、超低渗、裂缝、次生孔隙发育、源储一体、热演化程

【相似文献】