地质学报2017，Vol.91Issue(3)：668-677,10.
碳酸盐岩储层原油裂解过程中的钙、硫分子地球化学研究——同步辐射XANES技术的应用
Molecular Geochemistry Study of Calcium and Sulfur in the Process of Crude Oil Cracking in Carbonatic Rock Reservoirs:Application of Synchrotron Radiation XANES Technology
摘要
Abstract
In order to understand the variety of sulfur and calcium elements during oil cracking in carbonate reservoirs,Ordovician Yingshan Formation oil collected from well TK772 in the Tahe Oilfield was used to simulate gas generating experiment under the simulation stratum condition through semi-open test system "formation porosity thermocompression simulation experiment instrument".Chemical occurrence mode of sulfur and calcium elements in solid products were precisely tested using synchrotron radiation technology X-ray absorption.The results show that sulfur compounds in solid products of crude oil pyrolysis (crude oil + limestone (Series 1)) are thiophene and calcium sulfate,which should be the product of the partial oxidization of thiophene substance during crude oil pyrolysis,with calcium-bearing compound dominated by calcium carbonate.Sulfur-containing compound,which forms during pyrolysis process of dissolved sulfate-bearing crude oil (crude oil + limestone + magnesium sulfate (series 2)),consists dominantly of calcium sulfate,with minor thiophenes,and may be result of the dissolved sulfate (magnesium sulphate) addition,TSR,and dissolution-precipitation.With increasing of temperature and pressure in series 2,H2 S generation and relative percentage of calcium sulfate increase,indicating the occurrence of thermochemical sulfate reduction (TSR) in crude oil cracking process.Formation and enrichment of calcium sulphate also shows that acidic fluid generated during TSR produces not only significant dissolution of carbonate reservoirs but secondary gypsum.关键词
X射线吸收近边结物(XANES)/硫酸盐热化学还原反应/原油裂解/有机-无机相互作用/碳酸盐岩储层Key words
XANES/TSR/oil cracking/organic-inorganic interactions/carbonate reservoir引用本文复制引用
罗厚勇,刘文汇,腾格尔,王万春,梁明亮,苏龙,韩元红,曹涛涛,赵恒..碳酸盐岩储层原油裂解过程中的钙、硫分子地球化学研究——同步辐射XANES技术的应用[J].地质学报,2017,91(3):668-677,10.基金项目
本文为国家“973”计划项目(编号2012CB214801)和国家自然科学青年基金(编号41503033)联合资助成果. （编号2012CB214801）
