ISSN 1009-6248CN 61-1149/P 双月刊

主管单位:中国地质调查局

主办单位:中国地质调查局西安地质调查中心
中国地质学会

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    安塞坪桥区延长组长9致密油储层预测及有利区优选

    Chang 9 Tight Oil Reservoir Prediction and Favorable Zone Selection in Yanchang Formation of Ansaipingqiao Area

    • 摘要: 针对安塞坪桥区长9油层组致密油储层难以预测、勘探开发有利区不明确、严重制约勘探开发进程等问题,笔者通过对典型取心井岩相、测井相研究,在确定砂岩沉积微相类型及其空间演化的基础上,对砂岩进行横向追踪对比,准确获取单砂体厚度数据,刻画出单砂体展布特征,并结合生产动态情况,优选出致密油勘探开发有利目标区。研究结果表明,研究区致密油主要分布在长9油层组上部,自上而下可以分为3套砂体。其中,上部1号砂体属于小范围水下分流河道沉积,砂体厚度为1~3 m,油藏分布局限,开发潜力小;下部3号砂体属于水下分流河道沉积,砂体厚度为6~12 m。预测研究区中部P149-6井区、南部H87-19井区和W328-8井区是致密油开发的有利区,其中研究区中部P149-6井区油层分布稳定,对油藏认识程度较高,能够作为水平井开发先导试验靶区。研究成果有效解决了坪桥区致密储层预测难的问题,可以为具有相似地质特征的储层预测提供参考。

       

      Abstract: This paper studies the lithofacies and logging facies of typical coring wells. The sandstone is tracked and compared horizontally on the basis of the types of sedimentary microfacies of the sandstone and its spatial evolution. The thickness data of the single sand body is accurately obtained and the distribution characteristics of the single sand body are thus described. Therefore, favorable target area of tight oil are optimized through the production dynamics. The results show that the tight oil in the study area is mainly distributed in the upper part of the Chang 9 oil layer group, dividing into three sets of sand bodies from the top to the bottom. The upper No.1 sand body belongs to the underwater distributary channel deposits, with a thickness of 1~3m. The reservoir distribution is limited and the development potential is small. The lower No. 3 sand body belongs to the underwater distributary channel deposition, and the thickness of the sand body is 6-12m. It is predicted that the central P149-6 well area, the southern H87-19 well area and the W328-8 well are the favorable zones for tight oil development. Among them, the central P149-6 well has stable oil layer distribution, and can be a pilot test area. The research effectively solves the problem of tight reservoir prediction in Pingqiao area, and provides reference for reservoir prediction in similar geological areas.

       

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