塔里木盆地有机酸来源、分布及对成岩作用的影响

被引:81
作者
蔡春芳
梅博文
马亭
赵红静
方孝林
机构
[1] 江汉石油学院
关键词
有机酸,来源与分布,SOLMINEQ.88模拟,次生孔隙;
D O I
10.14027/j.cnki.cjxb.1997.03.019
中图分类号
P578.98 [有机化合物];
学科分类号
摘要
塔里木盆地寒武—第三系储层油田水实测表明:有机酸浓度高峰值分布于4300m以下及不整合面附近;来源于干酪根热成熟作用、原油微生物降解和热化学硫酸盐还原作用等;有机酸浓度多占总碱度30%~70%,可达92%,对油田水的pH值影响甚大。油田水中Al浓度在含油层中可高达3.1~5.4mg/L,Al可能以有机络合物形式存在。用国际上常用的水—岩反应地化软件SOLMINEQ.88,对石炭、三叠和侏罗系主要造岩矿物溶解—沉淀进行模拟,结果表明,斜长石在储层温度81℃~138℃范围内均可发生溶解作用;低于132℃时,高岭石处于超饱和状态,可沉淀;在有机酸参与下,斜长石溶解是该区次生孔隙的主要成因。这与岩观察吻合。
引用
收藏
页码:105 / 111
页数:7
相关论文
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