[1]冯佳睿,高志勇,崔京钢,等.长石表生淋滤溶蚀模拟实验[J].新疆石油地质,2018,(06):660.[doi:10.7657/XJPG20180605]
 FENG Jiarui,GAO Zhiyong,CUI Jinggang,et al.Simulation Experiment of Feldspar Supergene Leaching and Dissolution[J].Xinjiang Petroleum Geology,2018,(06):660.[doi:10.7657/XJPG20180605]
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长石表生淋滤溶蚀模拟实验()
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《新疆石油地质》[ISSN:1001-3873/CN:65-1107/TE]

卷:
期数:
2018年06期
页码:
660
栏目:
出版日期:
2018-12-01

文章信息/Info

Title:
Simulation Experiment of Feldspar Supergene Leaching and Dissolution
文章编号:
1001-3873(2018)06-0660-06
作者:
冯佳睿1高志勇1崔京钢1樊小容2
(1.中国石油 a.勘探开发研究院 石油地质实验研究中心;b.油气储层重点实验室,北京 100083;2.中国石油大学 地球科学学院,北京 102249)
Author(s):
FENG Jiarui1 GAO Zhiyong1 CUI Jinggang1 FAN Xiaorong2
(1.PetroChina, a.Petroleum Geology Research and Laboratory Center, Research Institute of Petroleum Exploration and Development; b.Key Laboratory of Oil and Gas Reservoirs, Beijing 100083, China; 2.School of Geosciences, China University of Petroleum, Beijing 102249, China)
关键词:
长石表生淋滤成岩模拟溶蚀酸性流体
Keywords:
feldspar supergene leaching diagenetic simulation dissolution acidic fluid
分类号:
TE125
DOI:
10.7657/XJPG20180605
文献标志码:
A
摘要:
利用自主研发的成岩模拟系统,选取中粒长石砂岩为研究对象,对表生淋滤机制下长石的溶蚀微观特征、易溶组分、成岩流体离子变化、溶蚀产物等开展成岩模拟。研究表明:在酸性流体条件下,不同类型长石发生不同程度的溶蚀作用,斜长石溶蚀程度强烈,颗粒表面呈现港湾状深沟或沿双晶方向溶蚀,钾长石多为颗粒边缘或颗粒内部溶蚀。成岩流体中K+,Na+,Ca2+,Mg2+,Al3+,Si4+等离子浓度的变化反映长石的溶蚀状态,K+,Na+和Ca2+浓度增加指示钾长石、钠长石和钙长石的溶蚀速率加快。长石溶解过程中产生的K+浓度较低,且被迅速带走,伊利石沉淀所需的K+浓度很难达到,因此长石溶蚀产生的自生黏土矿物多为高岭石,Mg2+浓度的变化可能代表后期碳酸盐矿物、黏土矿物的溶解。酸性流体流速、温度、长石颗粒表面积、溶蚀时间等是影响长石溶蚀作用的主要因素。
Abstract:
Using the self-developed diagenetic simulation system, the paper selects the medium-sized feldspar sandstone as the research object, and carries out diagenetic simulations on microscopic dissolution characteristics, soluble components, ion changes of diagenetic fluids and dissolution products of feldspar dissolution. The study shows that under the condition of acidic fluid, different types of feldspar have different degrees of dissolution and intense dissolution occurs to plagioclase, and its particle surface shows a harbor-shaped deep groove or dissolutions along the direction of the twin crystals. Dissolution mostly occurs at the edge or in the interior of the particles of potassium feldspar. The variations of the concentrations of K+, Na+, Ca2+, Mg2+, Al3+, Si4+ etc. reflect the status of feldspar dissolution, and the increase of the concentrations of K+, Na+ and Ca2+ indicate the acceleration of the dissolution rate of K-feldspar, albite and plagioclase. The concentration of K+ during the feldspar dissolution is relatively low and the ion is easy to be taken away rapidly, which result in the difficulties of K+ concentration required by illite deposition to be reached. Therefore, the authigenic clay minerals generated during the feldspar dissolution are mostly kaolinite. The changes of Mg2+ concentration may represent the dissolutions of carbonate and clay minerals at the late stage. Flow rate of acid fluid, temperature, surface area of feldspar grain and dissolution time are the key factors influencing feldspar dissolution
更新日期/Last Update: 2018-12-05