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哈得4油田位于塔里木盆地满加尔凹陷北部的哈得逊构造带上,主要目的层为石炭系底部东河砂岩,油藏埋深超过5000m,幅度低于34m,东河砂岩储层属于海侵体系域的滨岸相沉积石英砂岩,向北超覆尖灭,通过勘探开发证实油水界面自东南向西北倾斜,相差近80m,油藏受地层超覆尖灭和构造双重控制,是典型的隐蔽油藏。哈得4油田东河砂岩油藏还存在含油面积大(已证实超过130km2),储层厚度小(平均有效厚度小于6m),储量丰度低(小于50×104t/km2)等特点,而且在目的层上部二叠系地层发育一套厚度不等的火成岩层,给速度场的研究带来很大困难。针对这些特点,采用勘探开发一体化的模式,整体部署,分步实施,边滚动,边攻关,逐步加深认识扩大勘探开发成果;从技术上进行了以下四个方面的攻关研究:一是加强地震采集处理解释的攻关,提高分辨率,结合钻井资料,准确识别东河砂岩的尖灭线,搞清其分布规律;二是加强速度场研究,提高变速成图的精度,通过新钻关键井不断进行校正,大大提高了构造描述的精度;三是加强层序地层学研究,搞清东河砂岩的分布规律;四是通过逐步外推的办法,加深对倾斜油水界面的认识,结合构造描述和钻井结果,逐步认清了油水界面的变化规律。哈得4油田东河砂岩隐蔽油藏的勘探开发是一个逐步深入的过程,已实现了从1998年发?
The Hud 4 oil field is located on the Hudson tectonic belt in the northern Manjial Sag of the Tarim Basin. The main target is the East River sandstone at the bottom of the Carboniferous. The buried depth of the oil reservoir exceeds 5000m and the amplitude is less than 34m. The East River sandstone reservoir belongs to the transgressive The sedimentary quartz sandstone of the shore system of the system tract overturns north and pinch out. Through exploration and development, it is proved that the oil-water interface slopes from southeast to northwest with a difference of nearly 80m. The reservoir is covertly controlled by strata overburden and dual structure and is a typical concealed Reservoir. The Donghe sandstone reservoirs in Hud 4 oilfield also have the characteristics of large oil area (over 130 km 2), small reservoir thickness (less than 6 m average effective thickness) and low abundance (less than 50 × 104 t / km 2) In the upper Permian strata of the target layer, a set of igneous rocks with different thickness are developed, which brings great difficulties to the study of velocity field. In response to these characteristics, the exploration and development integration model is adopted, and the overall deployment and step-by-step implementation are carried out. While scrolling and tackling key problems, we gradually deepen our understanding and expand the achievements in exploration and development. From the technical aspects, we carry out research in the following four aspects: First, Acquisition and processing of interpretation of the key to improve the resolution, combined with drilling data, accurately identify the pinnacle of East River sandstone and find out its distribution; Second, to speed up the field to improve the accuracy of variable speed mapping, The third is to strengthen the study of sequence stratigraphy and find out the distribution law of Donghe sandstone; fourth, through the step-by-step extrapolation to deepen the understanding of the tilted oil-water interface, combining the description of the structure and Drilling results, and gradually identify the changing law of oil-water interface. Exploration and development of concealed reservoir of Donghe sandstone in Hud 4 is a step-by-step process that has been achieved since 1998.