辽河坳陷古近系页岩油气测井识别

Liaohe Depression Paleogene Shale Oil and Gas Well Logging Identification

辽河坳陷古近系广泛发育泥页岩层,是页岩油气勘探的热点层系,利用测井技术识别该地区页岩油气经济有效。研究了古近系泥页岩段测井响应特征,并对页岩储层测井响应机理进行剖析,认为有机质增多声波时差(AC)增大,烃类增多电阻率(Rt)变大。在ΔlgR方法基础上,将Rt和AC曲线反向叠合,依据叠合曲线的幅度差指示有机质和烃类的异常响应,进而定性地识别页岩油气。将页岩油气有效层的Rt与AC曲线的幅度差形态分成三类统计地质特征,发现各类形态具有一定的地质特征规律,可根据形态分类半定量地对页岩油气有利性进行评价。该页岩油气测井识别方法快捷有效具有应用推广价值。

Liaohe depression Paleogene shale which is a focused strata in shale oil and gas exploration develop extensively. Well logging technology is an economic and effective identification method of shale oil and gas in this area. Paleogene shale logging response characteristics and mechanism were studied,and it is concluded that organic matter increase acoustic time（ AC）,hydrocarbon increase resistivity（ Rt）. Based on ΔlgR method,Rt curve and AC curve are reverse superimposed. According to the separation forms of superimposed curves,organic matter and hydrocarbon anomaly response are indicated,and shale oil and gas can be identified qualitatively. The separation forms of Rt and AC curves of shale oil and gas effective layers are divided into three types and geological features of these types have certain regularity by statistics. According to the classification of superimposed curves,the effectivity of shale oil and gas layers can be semi-quantitatively evaluated. The shale oil and gas logging identification method is quick and effective which has practical promotion value.