辽河油田稠油区块硫化氢分布特征及成因研究

蒸汽驱是开采稠油的行之有效的方法之一，但辽河油田稠油区块在注蒸汽开采过程中却出现了较高浓度的硫化氢气体,而对于这种硫化氢的成因一直存在不同的认识。通过现场调查、跟踪监测及大量油、气、水分析，认为硫的可能来源主要为稠油中的含硫化合物、地层中的硫酸盐矿物及外来的含硫化学试剂。总结了硫化氢的分布规律和主要控制因素，并通过硫同位素分析和模拟试验指出辽河油田稠油区块硫化氢的成因主要为含硫化合物的热分解，其次为硫酸盐热化学还原。

Distribution and Origin of Hydrogen Sulphide in Heavy Oil Block, Liaohe Oil-Field

Steam drive is a good method to exploit heavy oil. But in the process of steam exploitation, hydrogen sulphide occurred in the heavy oil block of the Liaohe Oilfield. The concentration of hydrogen sulphide in the steam drive block is especially high. Through field investigation, monitoring and oil and gas analysis, it is considered that the sulfur sources are sulfides in heavy oil, sulfate minerals in stratums and sulphur\|bearing chemical reagents. The distribution and its control factors of hydrogen sulphide are also summarized in this paper. According to sulphide isotope analysis and simulated tests, the origin of hydrogen sulphide in the heavy oil block of the Liaohe Oilfield is mostly thermal decomposition of sulfides, secondly thermochemical sulfate reduction.