辽河西部凹陷双清地区成岩作用研究与有利储集相预测
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摘要
全球范围内的统计表明,约有三分之一的油气资源分布在埋深大于3500m的深层。然而,随埋深的增加,储层的物性变差,直至失去工业价值。所以,在深层油气勘探中,地质家们迫切需要了解深部储层的成岩状态和有利储层的分布范围。本文试图通过成岩作用研究与储层综合评价技术,预测辽河西部凹陷双清地区深层有利储层的平面展布,进一步丰富和完善砂砾岩体隐蔽油气藏的勘探技术。
     成岩作用的研究结果表明,双清地区新生界碎屑岩储层可划分为早成岩和中成岩两个阶段,共五个亚期,主要发育早期压实胶结相、溶蚀相、溶蚀及部分再胶结相和紧密压实相四种成岩相。纵向上储层发育三个高孔带,主要分布在扇三角洲水下分流河道、河口坝及前缘席状砂、湖底扇的辫状沟道和前缘-外扇等相带。第Ⅰ异常高孔带由大气水淋滤和有机酸对储层的溶蚀共同形成,第Ⅱ、Ⅲ异常高孔带则主要由有机酸的溶蚀作用和粘土矿物脱水作用形成。
     通过叠加沉积相图和成岩相图预测了有利储集相的分布,平面上圈定出有利储层、较有利储层发育区。建议在有利储层和较有利储层发育区寻找圈闭,进行隐蔽油气藏勘探与进一步的研究工作。
As the data collected from all over the world shows, one-third of oil and gas distributes in the reservoir buried deeper than 3500 meters underground approximately . With the burial depth increased , the reservoir characters become worse and worse until there is no commercial value to exploit . Thus it is necessary for geologists urgently to know the diagenesis states in the deep buried reservoirs and the areas where favorable reservoirs developed in the deep horizons exploration . We attempt to predict the areas favorable reservoirs developed in the horizontal orientation in the deep horizons of the west depression of Liaohe, then enrich and perfect the exploration technology of sandstone and conglomerate in the subtle reservoir ulteriorly by studies on diagenesis and evaluating methods of oil and gas reservoirs .
     As the results of the diagenesis researches show , the reservoirs composed of clastic rock in the Shuangqing area can be divided into the early diagenetic stages and the middle diagenetic stages , aggregately five subphases . It can be divided dominantly into four diagenetic facies , the early compaction and cementation , dissolution , dissolution and partial recementation , strong compaction diagenetic facies . Three high porosity zones develop in the vertical orientation . They mostly occur in fan-delta subsea distributary channels, mouth bars and front sand sheet, braid channel of sublacustrine fan and front-outside fan and so on. We believe that the first high porosity zone formed by eluviation of meteoric waters and dissolution of organic acids to reservoir, the second and the third one mainly formed by dissolution of organic acids dehydration of clay minerals .
     According to superimposing the map of precipitation facie and diagenetic facies, we have predicted the distribution of favorable reservoir facies, and blocked out the developed favorable and the relatively favorable reservoirs in the area. It’s suggested that we should seek the traps that develop in favorable and the relatively favorable reservoirs area and do further explorations and researches in the areas.
引文
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