哈拉哈塘凹陷含硫化氢天然气地球化学特征  

Geochemical characteristics of H_(2)S-bearing natural gas from Halahatang sag

作　　者：何大祥[1,2] 李博偲 胡锦杰 莫少武 唐友军[1] HE Daxiang;LI Bocai;HU Jinjie;MO Shaowu;TANG Youjun(Cooperative Innovation Center of Unconventional Oil and Gas (Ministry of Education & Hubei Province),Yangtze University, Wuhan 430100, China;State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum(Beijing), Beijing 102249, China)

机构地区：[1]长江大学非常规油气省部共建协同创新中心,湖北武汉430100 [2]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249

出　　处：《中国石油大学学报（自然科学版）》2022年第1期44-52,共9页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：中国石油科技创新基金项目(2017D-5007-0105);非常规油气省部共建协同创新中心(长江大学)开放基金项目(UOG2020-12);油气资源与探测国家重点实验室开放基金项目(PRP/open-1710)。

摘　　要：以塔里木盆地哈拉哈塘凹陷内含硫化氢气藏为研究对象研究天然气的组分、同位素等地球化学特征,对其成因及运移方向进行探讨。结果表明哈拉哈塘凹陷含H_(2)S天然气干燥系数较低,分布在0.45~0.85,为湿气,且以原油伴生气为主,部分天然气具有生物气特征,成熟度较低;天然气干燥系数及成熟度由南向北降低,天然气可能由南向北运移;中—上奥陶统含硫碳酸盐岩及其沉积期间的海侵过程分别为天然气中H_(2)S的生成提供了物质基础和有利环境,天然气中H_(2)S质量分数与干燥系数和CO_(2)质量分数无明显相关性,但随δ^(13)C_(1)、δ^(13)C_(2)、δ^(13)C_(3)及δ^(13)C_(4)的减小H_(2)S质量分数增加,结合该地区原油的生物降解特征,认为天然气中H_(2)S为微生物硫酸盐还原成因。The geochemical characteristics of natural gas such as composition and isotope were studied on the basis of H_(2)S-bearing gas reservoirs in Halahatang sag,Tarim Basin.And the origin and migration of natural gas were discussed.It is found that H_(2)S-bearing natural gas in Halahatang sag has a relatively low dry coefficient,which is in the range of 0.45-0.85 and can be classified as wet gas.This most belongs to the oil associated gas with the characteristics of biogas and a relatively low maturity.The decrease of the dry coefficient and maturity from south to north indicates the possible direction of natural gas migration.Sulfur bearing carbonate rock of Middle-Upper Ordovician and the transgressional processes during the deposition provide the material foundation and favorable environment,respectively.The H_(2)S content has no obvious correlation with the CO_(2)content and dry coefficient.The values of δ^(13)C_(1),δ^(13)C_(2),δ^(13)C_(3) andδ^(13)C_(4) decrease with increasing H_(2)S content.In combination with the biodegradation of the oil,it can be concluded that BSR(bottom simulating reflector)reaction occurs in H_(2)S-bearing reservoirs in Halahatang sag.

关 键 词：成熟度 硫化氢 生物硫酸盐还原作用 哈拉哈塘凹陷 

分 类 号：P593[天文地球—地球化学]