西湖凹陷平北地区平湖组基于地震多属性的储层预测

PREDICTION OF RESERVOIRS IN PINGHU FORMATION OF PINGBEI AREA BASED ON SEISMIC MULTI-ATTRIBUTE ANALYSIS

始新统平湖组是东海西湖凹陷平北地区最重要的油气储层,但受资料条件的限制,应用常规方法无法进行精细的储层预测,制约了研究区的油气勘探部署和进程。应用地震多属性分析技术,结合测井曲线、岩心、岩性及区域地质资料,对平北地区平湖组的岩相进行了精细解释,并对有利目标区进行了初步预测,结果表明,平北地区平湖组发育潮汐控制的三角洲相和潮坪相两种类型的沉积相,并以三角洲相内的储层发育,砂体连片性好,工区西南部三角洲前缘相发育区为油气勘探的有利目标区。

Pinghu Formation reservoirs, the most important ones in Pingbei area of the Xihu depression, can not be predicted precisely by using conventional methods due to absence of corresponding data, which has restricted hydrocarbon exploration and development in the study area. The authors applied seismic multi-attributes technique and combined with data of well logs, core, lithology and regional geology to interpret the lithofacies of Pinghu Formation in the Pingbei area, and also favorable area for hydrocarbon exploration has been predicted in this paper. The results show that two sedimentary facies （tidal flat and delta） influenced by tide are developed in the Pinghu Formation, and reservoir in the delta is better because of its flaky sandbody distribution. The southwestern part of the study area with delta-front facies is the favorable target for hydrocarbon exploration.