海相滨岸砂体构型精细解剖——以塔里木盆地哈得逊油田东河砂岩为例

Detailed architectural characterization of marine shoreface sand bodies: a case study from the Donghe sandstone in the Hudson Oilfield, Tarim Basin

摘要

以塔里木盆地哈得逊油田东河砂岩为研究对象,根据沉积构造与粒度特征,采用近井距取心井岩心观察、测井解释与连井对比等方法,分析东河砂岩储层岩相类型、岩相组合和构型级次划分,精细解剖3~5级构型单元,进行东河砂岩从单砂体内部到复合砂体的精细构型表征,明确滨岸砂体在小层尺度上的垂向叠置规律,构建砂体构型模式。结果表明:研究区划分12种岩石相类型及11种滨岸岩石相组合,界定8级构型界面及其识别标准;东河砂岩储层划分为8个构型级次单元,东河砂岩从单砂体内部到复合砂体的精细构型表征与叠置规律,主要受海平面升降控制下的层序充填过程影响;滨岸砂体在小层尺度上的垂向叠置规律即第6小层表现为海侵特征,第5小层表现为加积特征,第4和第3小层转变为海退特征。该结果为东河砂岩剩余油的预测及后续开发调整方案的制定提供地质依据。

Abstract

Taking the Donghe sandstone in the Hudson Oilfield of the Tarim Basin as the research object, based on sedimentary structures and grain size characteristics, methods such as core observation of close-spacing cored wells, well logging interpretation, and well-to-well correlation were employed to carry out the classification of lithofacies types, lithofacies associations, and architectural hierarchies in the Donghe sandstone reservoir. The architectural units of orders 3 to 5 were finely dissected to reveal the detailed architectural characterization from individual sand bodies to composite sand bodies, clarify the vertical stacking patterns of shoreface sand bodies at the sublayer scale, and establish a sand body architectural model. The results indicate that 12 lithofacies types and 11 types of shoreface lithofacies associations were identified in the study area, and 8 orders of architectural interfaces along with their identification criteria were defined. The Donghe sandstone reservoir was divided into 8 architectural hierarchies, with emphasis placed on the analysis of orders 3 to 5. The detailed architectural characterization and stacking patterns of the Donghe sandstone from individual sand bodies to composite sand bodies are primarily controlled by the sequence filling process under the influence of sea-level fluctuations. The vertical stacking pattern of shoreface sand bodies at the sublayer scale is as follows: sublayer 6 exhibits transgressive characteristics, sublayer 5 shows aggradational characteristics, while sublayers 4 and 3 shift to regressive characteristics. These results provide a geological basis for the accurate prediction of remaining oil and the formulation of subsequent development adjustment plans for the Donghe sandstone.

关键词

滨岸砂体 / 海相 / 东河砂岩 / 储层构型 / 构型单元 / 岩石相 / 哈得逊油田 / 塔里木盆地

Key words

shoreface sand body / marine facies / Donghe sandstone / reservoir architecture / architectural element / lithofacies / Hudson Oilfield / Tarim Basin

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基金资助

国家自然科学基金项目(42072121)

国家自然科学基金项目(42302175)