川东北元坝地区储层溶洞石英及白云石胶结物中包裹体特征及意义

发布时间：2018-01-12 23:00

  本文关键词：川东北元坝地区储层溶洞石英及白云石胶结物中包裹体特征及意义　出处：《地质学报》2017年09期 　论文类型：期刊论文

  更多相关文章： 包裹体 元坝气田 TSR反应

【摘要】：川东北元坝气田是中国南方大型油气田之一,通过对元坝224井上二叠统储层溶洞石英及白云石中包裹体的岩相学、激光拉曼以及显微测温分析发现,溶洞石英中包裹体类型复杂,主要由气液两相包裹体、气体包裹体以及含子矿物包裹体组成,包裹体的气相组分主要由CH4、H2S以及CO2组成,包裹体的子矿物为单质硫以及沥青,包裹体共生组合关系复杂,不同类型包裹体常叠加在一起,气液两相包裹体均一温度以及含单质硫三相包裹体的气液均一温度范围相似,分别为161.5~220.6℃以及168.2~218.6℃,二者的盐度分布范围差别较大,分别为7.45%~10.36%NaCl以及8.68%~21.11%NaCl;溶洞白云石中包裹体类型单一,由气液两相包裹体组成,个别包裹体的气相中含有CH4,包裹体的均一温度为102.4~132.1℃。包裹体的古温度古压力分析表明,溶洞石英中包裹体捕获于中—晚侏罗世,包裹体捕获时地层流体为超压,捕获于原油大量裂解生成天然气阶段。溶洞石英中不同类型包裹体的组合关系以及温压特征记录了储层中TSR反应的过程,即硫酸盐先与重烃反应生成H2S以及单质硫,然后硫酸盐以及生成的单质S再与CH4继续反应生成H2S以及CO2,随着TSR反应的进行,储层中的压力逐渐增大。TSR反应生成的H2S以及CO2流体可能与储层发生了较强烈的水-岩反应,造成了储层的硅化以及溶洞中石英、白云石的沉淀。
[Abstract]:Yuanba gas field in northeast Sichuan is one of the large oil and gas fields in southern China. The petrographic, laser Raman and microthermometer analysis of inclusions in karst cave quartz and dolomite in Upper Permian reservoir of well Yuanba 224 have been found. The types of inclusions in cavern quartz are complex, mainly composed of gas-liquid two-phase inclusions, gas inclusions and sub-mineral inclusions, and the gas phase components of inclusions are mainly composed of Ch _ 4H _ 2S and CO2. The subminerals of inclusions are elemental sulfur and bitumen. The symbiotic assemblage of inclusions is complex and different types of inclusions are often superimposed together. The homogenization temperature of gas-liquid two-phase inclusions and the gas-liquid homogenization temperature range of three-phase inclusions containing elemental sulfur are similar, which are 161.5 ~ 220.6 鈩，

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