柴达木盆地英雄岭构造带渐新世湖水盐度对碳酸盐岩沉积发育的控制作用  

Controlling Effect of Oligocene Lake Salinity on Carbonate Sedimentary Development in Yingxiongling Tectonic Belt,Qaidam Basin

作　　者：易定红[1] 李翔[1,2] 石亚军 李积永[3] 刘应如[1] 马元坤[3] 倪祥龙 王文卓[3] YI Ding-hong;LI Xiang;SHI Ya-jun;LI Ji-yong;LIU Ying-ru;MA Yuan-kun;NI Xiang-long;WANG Wen-zhuo(PetroChina Research Institute of Petroleum Exploration and Development-Northwest,Lanzhou 730020,China;Key Laboratory of Reservoir Description,CNPC,Lanzhou 730020,China;PetroChina Qinghai Oilfield Company,Dunhuang 736202,China)

机构地区：[1]中国石油勘探开发研究院西北分院,甘肃兰州730020 [2]中国石油集团油藏描述重点实验室,甘肃兰州730020 [3]中国石油青海油田公司,甘肃敦煌736202

出　　处：《东华理工大学学报（自然科学版）》2022年第1期10-18,共9页Journal of East China University of Technology(Natural Science)

基　　金：中国石油天然气股份有限公司重大科技专项(2016E-01);中国石油天然气股份有限公司科学研究与技术开发项目(2021DJ1705);国家科技重大专项(2016ZX05003-006)。

摘　　要：为了整体评价柴达木盆地西部英雄岭构造带中段和东段渐新世湖相碳酸盐岩的油气勘探前景以及预测有利勘探区带,以下干柴沟组上段(E_(3)^(2))为例,在岩芯观察、钻/测井资料和三维地震资料综合分析的基础上,结合岩石薄片、氯离子含量、全岩矿物分析、膏盐岩分布和地球化学敏感参数分析,对该地区E_(3)^(2)湖水古盐度和碳酸盐岩沉积演化进行了详细研究。结果表明,英雄岭地区E_(3)^(2)从早期到晚期水体从半咸水、咸水过渡到盐水,盐度不断增大。平面上,从英西到英东,膏盐岩发育程度变差,湖盆水体盐度降低。英雄岭地区E_(3)^(2)碳酸盐岩矿物组分复杂、岩性多样,分区性明显,纵向上早期碳酸盐岩的发育程度好于晚期,平面上碳酸盐岩主要分布在英西和英中北部地区,英中南部其次,英东地区较差。In order to comprehensively evaluate the oil and gas exploration prospects of Paleogene Oligocene lacustrine carbonate rocks in the middle and eastern segments of Yingxiongling tectonic belt in western Qaidam basin,and predict favorable exploration zones,it takes the upper member of Ganchaigou Formation(E_(3)^(2))as an example.Based on the comprehensive analysis of core observation,drilling/logging data and three-dimensional seismic data,and combined with the analysis results of rock thin section,chloride ion content,whole rock mineral analysis,gypsum rock distribution and geochemical sensitive parameters,the paleosalinity and carbonate sedimentary evolution of E_(3)^(2)in this area are studied in detail.The results showed that the water in the lake changed from brackish water and salt water to saline water,the salinity was increased continuously from early to late in the upper member of lower Ganchaigou Formation.The development degree of gypsum-salt rock becomes worse and the salinity of lake basin decreases from Yingxi to Yingdong area in a plane.The carbonate rocks in Yingxiongling area have complex mineral composition,diversified lithology and obvious zoning.Longitudinally,the development of early carbonate rocks is better than that of late ones.In a plane,the carbonate rock distributed mainly in the Yingxi and the north of the Yingzhong area,secondly in the south of the Yingzhong area,thirdly in the Yingdong area.

关 键 词：碳酸盐岩 古盐度 下干柴沟组上段 古近纪 英雄岭构造带 柴达木盆地 

分 类 号：P588.245[天文地球—岩石学]