中拐地区侏罗系地层水特征及油气勘探有利区预测  

CHARACTERISTICS OF JURASSIC FORMATION WATER AND PREDICTION FOR EXPLORATION FAVORABLE ZONE,ZHONGGUAI AREA

作　　者：陈小蓉[1] 夏青[2] 蔡义峰[2] 白雪峰[2] 于浩业[2] 

机构地区：[1]中国石油新疆油田公司准东采油厂 [2]中国石油新疆油田公司勘探开发研究院

出　　处：《天然气勘探与开发》2013年第1期20-23,27,共5页Natural Gas Exploration and Development

摘　　要：运用水文地质学原理,对准噶尔盆地中拐地区多层系地层水水型、矿化度进行分析,结果表明从石炭系、二叠系、三叠系、侏罗系到白垩系,封闭环境变差,而侏罗系是从封闭环境到开放环境的过渡带—压力平衡带,易于成藏,目前出油井点最多。通过对油层、水层、油水同层、含油水层和气水同层的试油测试,得到了不同的结果,因此对地层水矿化度进行了统计,发现了高矿化度是水层的特点,中高矿化度是油气藏的有利区,据此圈定了油气勘探有利区块;研究表明,氯离子、碳酸根离子浓度和总矿化度在中深度段最大,向浅或向深都会减小;氯根浓度与总矿化度具有很好的正相关关系;最后指出利用水型可定性地判断断裂封闭性和稠油成因。Based on hydrogeology,the type and salinity of formation water in Zhongguai area,Junggar Basin,are analyzed.Results show that(1) enclosed environment became worse from Carboniferous,Permian,Triassic,Jurassic to Cretaceous;(2) easily forming a reservoir,Jurassic is the transitional zone(also pressure-balanced zone) between enclosed and open environments,where there are the most oil-producing wells.Formation tests were carried out for oil,water,oil-water,oil-bearing water and gas-water layers,and different results were also obtained.According to the study on the concentration of formation-water salinity,this paper finds out that high salinity is the property of water layer;mid-to-high salinity represents the favorable zone of oil-gas reservoir.Research also indicates that chloride,carbonate and total-salinity ion concentrations reach the maximum at medium depth,and decrease at a shallower or deeper depth.There is a positive correlation between chloride and total salinity ion concentrations.Finally,this paper points out that sealing property of fracture and heavy-oil origin can be determined qualitatively by water type.

关 键 词：水型 矿化度 中高矿化度 断裂的封闭性 稠油成因 

分 类 号：P618.13[天文地球—矿床学]