本文關(guān)鍵詞：川東北元壩地區(qū)儲(chǔ)層溶洞石英及白云石膠結(jié)物中包裹體特征及意義　出處：《地質(zhì)學(xué)報(bào)》2017年09期 　論文類型：期刊論文

  更多相關(guān)文章： 包裹體 元壩氣田 TSR反應(yīng)

【摘要】：川東北元壩氣田是中國(guó)南方大型油氣田之一,通過對(duì)元壩224井上二疊統(tǒng)儲(chǔ)層溶洞石英及白云石中包裹體的巖相學(xué)、激光拉曼以及顯微測(cè)溫分析發(fā)現(xiàn),溶洞石英中包裹體類型復(fù)雜,主要由氣液兩相包裹體、氣體包裹體以及含子礦物包裹體組成,包裹體的氣相組分主要由CH4、H2S以及CO2組成,包裹體的子礦物為單質(zhì)硫以及瀝青,包裹體共生組合關(guān)系復(fù)雜,不同類型包裹體常疊加在一起,氣液兩相包裹體均一溫度以及含單質(zhì)硫三相包裹體的氣液均一溫度范圍相似,分別為161.5~220.6℃以及168.2~218.6℃,二者的鹽度分布范圍差別較大,分別為7.45%~10.36%NaCl以及8.68%~21.11%NaCl;溶洞白云石中包裹體類型單一,由氣液兩相包裹體組成,個(gè)別包裹體的氣相中含有CH4,包裹體的均一溫度為102.4~132.1℃。包裹體的古溫度古壓力分析表明,溶洞石英中包裹體捕獲于中—晚侏羅世,包裹體捕獲時(shí)地層流體為超壓,捕獲于原油大量裂解生成天然氣階段。溶洞石英中不同類型包裹體的組合關(guān)系以及溫壓特征記錄了儲(chǔ)層中TSR反應(yīng)的過程,即硫酸鹽先與重?zé)N反應(yīng)生成H2S以及單質(zhì)硫,然后硫酸鹽以及生成的單質(zhì)S再與CH4繼續(xù)反應(yīng)生成H2S以及CO2,隨著TSR反應(yīng)的進(jìn)行,儲(chǔ)層中的壓力逐漸增大。TSR反應(yīng)生成的H2S以及CO2流體可能與儲(chǔ)層發(fā)生了較強(qiáng)烈的水-巖反應(yīng),造成了儲(chǔ)層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，

本文編號(hào)：1416340