砂砾岩扇体叠合期次及有利储层预测:以东营凹陷北部陡坡带丰深1井区为例
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摘要
陡坡带砂砾岩扇体储层为近年来油气勘探的热点和难点之一,目前对该类储层的发育特征认识不清,描述技术尚未成熟。在测井响应特征的基础上,利用合成记录标定、模型正演及三维镂空透视等技术,对东营凹陷北部陡坡带丰深1井区砂砾岩扇体的叠合期次进行了研究,并预测了有利储层。结果表明,丰深1井区沙四下亚段盐膏层下砂砾岩体具有典型的近岸水下扇的测井响应,表现为砂砾岩体的速度随深度增加明显增大,且远远高于其上覆围岩的速度,油气相对比较富集的扇中部位与扇端之间存在明显的速度差,在地震上形成较强的反射。研究区发育3个有利的砂砾岩体带,均呈近南北向展布,根据研究区盐膏层下砂砾岩体具有扇根封堵、扇中富集、叠合连片的特点,将沙四下亚段盐膏层下划分为6个期次的扇体,近期部署的探井钻探情况与预测结果相吻合。
The reservoir of glutenite fans has been one of the hot and difficult issues for the hydrocarbon exploration.The characteristics of the reservoir is complex to be recognized,thurthermore,the describtion skill is still under-developed.Based on the characteristics of logging response,this paper studies the congruent times of glutenite fan in Fengshen 1block and predictes the favorable reservoir in that area by applying the technologies of synthetic seismogram calibration,model attributions and three-dimensional hollow out perspective.The results show that the glutenite under evaporite bed of Sha 4under sub-member in Fengshen 1well area is typical log response of nearshore subaqueous fans which is characterized by the rate of glutenite is significantly increased with the depth increasing and is higher than the speed of the overlying rock,the speed differences are noticed in the mid-fan and end-fan parts which has relatively enriched oil and gas,and strong reflection in seismic analysis.The three favorable glutenite belts are developed with north-south distribution patten in the study area.According to the characteristics of fan root sealed,fan medium enriched,congruent times,and composite sectors-connecting,the glutenite fan is divided into six period.The prediction results are consistent with the well drilling results.
引文
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