细分小层岩相古地理编图的沉积学研究及油气勘探意义——以鄂尔多斯地区中东部奥陶系马家沟组马五段为例

发布时间：2018-02-09 03:10

本文关键词： 蒸发岩碳酸盐岩岩相古地理编图细分小层马家沟组鄂尔多斯盆地　出处：《岩石学报》2017年04期 　论文类型：期刊论文

【摘要】：鄂尔多斯盆地中东部奥陶系发育巨厚的蒸发岩-碳酸盐岩旋回性沉积,地层厚度达500~900m。对其上部厚约200~350m的马家沟组第五段岩性、沉积相的进一步分析表明,其内部仍发育次一级的沉积旋回。而通过细分小层的沉积学研究和岩相古地理编图,对马五段的岩性相变规律及沉积演化特征的认识则更为明晰,对该区奥陶系的沉积学研究与天然气勘探部署也发挥了重要作用,主要体现在以下几方面:一是对于有利沉积相带(尤其是相控储层)的预测更为精准,细分小层的岩相古地理编图对主力目的层的研究分析更具针对性;二是对白云岩化机理的认识进一步深入,基本明确了短期海侵层序中的白云岩化受继承性古地理格局与层序演化的共同控制;三是推动古隆起东侧奥陶系中组合(马五5-马五10)岩性圈闭大区带成藏认识的形成,勘探发现了千亿方规模储量接替区;四是催生奥陶系盐下"侧向供烃成藏"模式的建立,指导近期盆地中部奥陶系盐下勘探取得重大突破。因此可以初步认为,细分小层的岩相古地理编图可能代表了古地理学发展的一个重要方向,无论是对相带展布、层序演化及白云岩化等沉积学方面的研究,还是对油气勘探工作中的有利储集体预测及圈闭成藏规律的认识,都具有一定的实际意义。
[Abstract]:The Ordovician developed thick evaporite carbonate cyclic sedimentation basin Erdos, strata thickness of 500~900m. on the upper part of the thickness of 200~350m fifth member of Majiagou formation lithology, sedimentary facies analysis further showed that its internal development is still a secondary sedimentary cycle. The sub layer of sedimentology and lithofacies paleogeography map, understanding lithology transformation rules and sedimentary evolution of the horse five section is more clear, in the area of Ordovician sedimentology and natural gas exploration has played an important role, mainly reflected in the following aspects: one is the favorable sedimentary facies (especially facies) the prediction is more accurate, the sub layer paleogeographic mapping research and Analysis on the main target layer more targeted; two is the further understanding of the basic mechanism of dolomitization, clear short transgression layer In order to dolomite by inheriting common control evolution of paleogeographic pattern and sequence; the three is to promote the combination of the Ordovician paleo uplift in (five 5- Ma Ma five 10) large lithologic trap zone formation reservoir understanding, exploration found billion scale reserves; four is the birth of the Ordovician salt "for the establishment of lateral hydrocarbon reservoir" model, guide the recent central basin Ordovician subsalt exploration breakthrough. So we can conclude that, the sub layer paleogeographic map may represent an important direction of the ancient geography development, regardless of the distribution of the sedimentary facies, sedimentary sequence and evolution of dolomite so, is the favorable reservoir prediction and traps for oil and gas exploration work in a Tibetan law, has certain practical significance.

【作者单位】：中国石油长庆油田分公司;低渗透油气田勘探开发国家工程实验室;
【基金】：“十三·五”国家科技重大专项(2016ZX05004-006)资助
【分类号】：P534.42;P618.13

【相似文献】