柴达木盆地尕斯库勒油田E_(3)^(1)油藏“双高”阶段测井精细解释方法

Logging interpretation method in “double-high” stage of E_(3)^(1) reservoir in Gaskule Oilfield,Qaidam Basin

柴达木盆地尕斯库勒油田E_(3)^(1)油藏经过多期调整开发目前已进入高含水、高采出程度的“双高”阶段。早期勘探阶段建立的测井解释模型的精度已不能满足现阶段油藏三维精细表征需求。为了满足研究需求,进一步改善高含水油田的开发效果,需开展测井精细解释评价研究。针对E_(3)^(1)油藏储层岩性变化大,粗、中、细砂岩发育及部分层段发育砂砾岩、砾岩的岩性复杂特点,采用多参数图形聚类分析算法,实现了该油藏岩性剖面连续处理解释,可以有效的识别岩性;针对开发历程长、测井系列多样、主力层电性特征差异大等问题,采用细分手段建立储层参数模型及解释标准,提高了测井解释精度;基于自然电位影响因素分析校正及室内渗流理论,建立了水淹层定量评价方法,实现了储层水淹级别的划分。研究成果为油藏精细描述及剩余潜力分析提供技术支撑。

After multi-stage infilling development,E_(3)^(1) reservoir in Gaskule Oilfield in Qaidam Basin has entered the “double-high” stage of high water cut and high recovery. The accuracy of logging interpretation model established in early exploration stage cannot meet the needs of detailed 3D characterization of reservoir at current stage.In order to meet the research needs and further improve development effect of high water cut oilfield,it is necessary to carry out research on fine logging interpretation and evaluation. In view of much variation of reservoir lithology,development of coarse,medium and fine sandstone and complex lithology of sandy conglomerate and conglomerate in some intervals of E_(3)^(1) reservoir,multi-parameter graphic cluster analysis algorithm is used to realize continuous processing and interpretation of lithologic section of E_(3)^(1) reservoir for the first time,which can effectively identify lithology. Aiming at the problems of long development history,diverse logging series and much difference of electrical characteristics of main layers,reservoir parameter model and interpretation criteria are established by subdivision method to improve logging interpretation accuracy. Based on analysis of influencing factors of spontaneous potential and lab flow theory,quantitative evaluation method of water swept layers is established,and division of reservoir water flooded level is realized. The research provides technical support for fine reservoir characterization and remaining potential analysis.