石油与天然气地质 ›› 2011, Vol. 32 ›› Issue (2): 165-174，191.doi: 10.11743/ogg20110202

• 石油与天然气地质 • 上一篇    下一篇

准噶尔盆地莫北油气藏主控因素再认识

  

  • 出版日期:2011-04-28 发布日期:2011-09-26

Discussion on the main controlling factors of Mobei oil/gas reservoirs in the Junggar Basin

  • Online:2011-04-28 Published:2011-09-26

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1010

被引次数

32

摘要：

摘要：针对制约莫北油气藏油气储量扩展主控因素的关键问题开展研究，发现早期勘探中没有认识到低孔渗、强敏感性储层特点，未采取有效的油气层保护措施，低孔渗和高粘土矿物含量导致测井评价不准确，是漏失油气层的主要原因。在消除影响油气层测井评价的岩性、物性等因素后，建立了能够正确评价油气层的图版，新发现26井36层漏失油气层；提出燕山期弧形断裂对侏罗系三工河组二段砂泥互层中的油气起侧向封堵作用；前期采集的大面元地震资料不能满足较小断层的识别和精细刻画，采用新采集的高分辨率三维地震资料，通过叠前深度偏移、储层预测、等时格架下的变速成图等技术，搞清了砂体和弧形断裂分布，从测井重新评价发现的漏失油气层出发，指出在油气运聚方向上的弧形断裂和有利沉积微相带耦合形成油气聚集有利区，通过老井重新试油和新钻井实现储量扩展。勘探证实该方法可行、成效明显，使莫北油气藏储量扩展了近3倍。该方法对类似地区的精细勘探和油气储量扩展有一定的借鉴作用。

关键词: 关键词：弧形断裂, 油气藏类型, 主控因素, 莫北油气藏, 准噶尔盆地

Abstract:

Abstract: This paper studies the main factors influencing reserve growth, of the Mobei oil/gas reservoir. Many oil/gas layers were not identified during the early exploration period due to several reasons. The first is that no effective measures were applied to protect the oil/gas layers with low permeability and porosity and strong sensitivity. The second is that the low permeability and porosity and high clay content lowered the accuracy of log interpretation. After eliminating the impacts of lithology, physical properties and other factors on logging evaluation of oil/gas reservoirs, we established board charts to evaluate the reservoir properly. Based on this, we found 36 new oil/gas layers being neglected before in well 26. The Yanshan arc fault acts as the lateral seal for the interbeded sandstone and shale reservoirs in the 2nd member of the Lower Jurassic Sangonghe Formation. As the large-bin seismic data acquired before cannot meet the requirements of identification and fine description of small faults, the new high resolution 3D seismic data were used to delineate the sandbodies and arc fault through prestack depth migration, reservoir prediction and variable velocity mapping under an isochronous sequence framework. The coupling of favorable sedimentary microfacies with the arc fault in the directions of hydrocarbon migration and accumulation can result in the formation of favorable plays. Therefore, reserve growth can be realized through reperforming formation test in old wells and drilling new wells. The reserves of Mobei oil/gas reservoir grow by near 3 fold after this method was applied. It also can be used in similar oil/gas fields. 

Key words:  , Key words： arc fault, reservoir type, main controlling factor, Mobei oil/gas reservoir, Junggar Basin