本文選題：柴達(dá)木盆地西部 + 獅子溝地區(qū)　； 參考：《天然氣工業(yè)》2017年05期

【摘要】：經(jīng)過多年的油氣勘探,已在柴達(dá)木盆地的多個層位發(fā)現(xiàn)了油氣藏。其中,該盆地西部(柴西)獅子溝地區(qū)古近系漸新統(tǒng)下干柴溝組上段是油氣勘探的重要目的層,膏鹽巖是該區(qū)油氣藏得以保存的優(yōu)質(zhì)蓋層。為了預(yù)測柴西下一步油氣勘探的方向和目標(biāo)、指導(dǎo)區(qū)域油氣勘探部署,在巖心觀察的基礎(chǔ)上,綜合薄片鑒定,粒度,敏感參數(shù)Sr/Cu、Fe/Mn、(Fe+Al)/(Ca+Mg)、V/(V+Ni)、Pr/Ph比值以及黃鐵礦含量,包裹體等分析結(jié)果,研究了該區(qū)膏鹽巖發(fā)育的沉積演化特征和沉積環(huán)境。結(jié)果表明:(1)膏鹽巖主要分布在湖盆的沉積中心,往盆地邊緣方向變薄,橫向上相變?yōu)樘妓猁}巖或陸源碎屑巖,平面分布呈不規(guī)則的橢圓形;(2)膏鹽巖縱向上主要發(fā)育在下干柴溝組上段的中部和上部,與碳酸鹽巖或陸源碎屑巖相間發(fā)育,單層厚度變化大、層數(shù)多、連續(xù)性較好;(3)下干柴溝組上段Ⅲ砂組—Ⅰ砂組(鹽間)地層沉積時氣候干旱炎熱,為半深湖—深湖還原性水體環(huán)境。結(jié)論認(rèn)為:(1)該區(qū)下干柴溝組上段膏鹽巖分布面積較廣,累計厚度較大;(2)膏鹽巖是在干旱炎熱氣候條件和深水背景下湖水蒸發(fā)濃縮結(jié)晶而成的,非熱液成因。
[Abstract]:After many years of oil and gas exploration, oil and gas reservoirs have been discovered in many layers of Qaidam Basin.The upper member of Lower Ganchaigou formation in the Paleogene Lower Ganchaigou formation in the Shizigou area of the western part of the basin (Chaixi) is an important target layer for oil and gas exploration, and gypsum salt rock is the high quality caprock for the preservation of oil and gas reservoirs in this area.In order to predict the direction and target of the next oil and gas exploration in the west of Qaixi, and to guide the regional oil and gas exploration deployment, based on the core observation, the thin slice identification, particle size, sensitive parameter Sr / Cu-Fe / Fe / mn / Fe Al)/(Ca / MgN / V / V / V / V / Ni / P / P ratio and the content of pyrite are synthesized.The sedimentary evolution characteristics and sedimentary environment of gypsum salt rock in this area are studied.The results show that the gypsum salt rocks are mainly distributed in the sedimentary center of the lake basin, thinning towards the margin of the basin, and the lateral facies become carbonate rocks or continental clastic rocks.The plaster salt rock is mainly developed in the middle and upper part of the upper part of the Lower Ganchaigou formation in the longitudinal direction, and developed with carbonate rock or terrigenous clastic rock. The thickness of single layer changes greatly and the number of layers is many.The upper member of Xiaganchaigou formation 鈪，

本文編號：1736042