根据储层成岩特征差异性判断浅层油气藏油气充注时间——以哈萨克斯坦A油田为例

传统地质分析、储层流体包裹体和伊利石测年等方法对于浅层油气藏油气充注时间的确定,都存在着明显的不足。基于烃类-水-矿物之间的相互作用,提出了根据储层成岩特征差异性判断浅层油气藏油气充注时间的新方法,并以哈萨克斯坦A油田为例,应用该方法确定了M-Ⅱ油层的油气充注时间。分析认为,部分成岩矿物含量的差异性可以表征油气大量充注时间的早晚。通过分析部分成岩矿物含量的差异性,结合成岩演化序列及埋藏热演化史,可以确定油气大量充注的时间。在成藏因素分析的基础上,结合成岩矿物相对含量的变化趋势,还可以追踪油气充注方向或判断油气充注过程。

T im ing of hydrocarbon charging in shallow reservoirs by differences of diagenetic characteristics of reservoirs -an example from A oilfield in Kazakhstan

For the tim ing of hydrocarbon charging in shallow reservoirs，methods such as traditional geological analysis，fluid inclusions in reservoirs and illite dating have obvious shortages.Based on the interactions between hydrocarbons，water and m inerals，this paper puts forward a newmethod to determ ine hydrocarbon charging time of shallow reservoirs by differences of diagenetic characteristics of reservoir rocks.Taking the A oilfield in Kazakhstan as an example，the hydrocarbon charging time for theMˉⅡoil layer is determ ined in this way.The time of bulk hydrocarbon charging can be determ ined through the analyses of differences of content of certain m inerals and in combination with diagenetic evolutionary sequence and burial thermal history.On the basis of poolˉform ing element analysis，hydrocarbon charging direction can be traced and hydrocarbon charging process can be identified with references to the trend of relative content of diagenetic m inerals.