托甫台区东河砂岩油藏地层结构与封堵性分析

托甫台西东河塘组顶面整体表现为东南倾伏的单斜构造，局部有较多的微型低幅度背斜。本地区东河砂岩油藏属于海退环境下受古地貌控制的以砂坝沉积为主的油藏。泥盆系东河塘组（D3d）及其下伏的志留系柯坪塔格组（S1k）、上覆的石炭系巴楚组（C1b1）在本地区都有剥蚀尖灭。东河塘组及与其相接触的地层在东河塘组尖灭线附件岩上性具有封堵接触与非封堵接触特征，构造、地层岩性以及地层接触关系三因素造成了东河塘组油藏圈闭顶、底板及侧向封堵的特色。通过构造及顶、底板岩性分析和侧向封堵性分析，找出了有效圈闭分布区域，对目前进一步的开采以及外围区进一步的勘探具有现实意义。

Strata Structure and Sealing Analysis for Donghe Sandstone Reservoir in Tuofutai Area

The top structure of Donghetang Formation to the west of Tuofutaiat is Monocline structure，and there are manylow-amplitude anticlines in the local area. In this region，Donghe sandstone reservoir is primarily a dam deposits reservoir，which is under the environment of regression by palaeo geomorphology control. Denudation pinchout happens in DevonianDonghetang Formation strata，silurian Kepingtage Formation strata under Donghetang Formation and carboniferous Bachuformation strata overlying Donghetang Formation. Lithology of Donghetang Formation strata and its contacting strata has alocal distribution features，structure，stratigraphic lithology and stratigraphic contact relation. These three factors caused thecharacteristics of sealing for Donghetang Formation reservoir trap of roof，floor and lateral. Through the construction and theroof and floor lithologic analysis and sealing analysis，the effective trap distribution area was found out，which has realisticmeanings to further exploitation at further exploration in the present and peripheral zones.