收稿日期: 2011-10-26
修回日期: 2011-12-28
网络出版日期: 2012-04-10
Vugular Formation of Carbonates in Ordovician YingshanReservoir in Tazhong Northern Slope of Tarim Basin
Received date: 2011-10-26
Revised date: 2011-12-28
Online published: 2012-04-10
孔洞是碳酸盐岩储层最基本的储集空间类型，对其发育特征和分布规律的研究一直是油气勘探研究的重点和难点。塔里木盆地塔中地区奥陶系鹰山组发育大型层间岩溶裂缝孔洞型储层，目前在该区已发现亿吨级大型凝析气田，具有良好的勘探潜力，但对于碳酸盐岩孔洞发育规律还缺乏深入的认识。根据岩心观察、成像测井分析以及地震属性提取，详细论述了塔中地区鹰山组碳酸盐岩孔洞发育特征、控制因素及分布规律。鹰山组碳酸盐岩孔洞较为发育，洞穴大多分布在距鹰山组顶部以下120m的范围之内，且洞穴发育具有明显的井区差异性；中小型溶蚀孔洞纵向上叠置,横向上具有良好的层位性和成层性,平面上大面积分布，在局部具有较强的非均质性和穿层性。孔洞发育主要受岩性岩相、层间岩溶、埋藏岩溶、构造断裂作用的叠合影响，尤其是层间岩溶和埋藏岩溶作用,能导致孔洞发育层位差异性。孔洞的发育为塔中地区鹰山组油气藏提供良好的储集空间,不仅能形成孔洞型储层和洞穴型储层,而且发育的孔洞与裂缝相连通,形成该地区重要的裂缝孔洞型储层。
孙崇浩，于红枫，王怀盛，刘虎，张正红，韩杰，罗新生 . 塔里木盆地塔中地区奥陶系鹰山组碳酸盐岩孔洞发育规律研究[J]. 天然气地球科学, 2012 , 23(2) : 230 -236 . DOI: 10.11764/j.issn.1672-1926.2012.02.230
Vug is a basic reservoir type of carbonate reservoir,but it is always highlight and difficulty in the research of vugular formation and distribution for the petroleum exploration.The large scale interstratal karst fissure-pore reservoir is discovered in the Ordovician Yingshan Formation in the Tazhong northern slope of Tarim basin.At present,the large scale condensate field with 108 ton-reserves has been discovered,suggesting that it has favorable exploration potential.But the understanding for the vugular formation and distribution in the Ordovician Yingshan Formation carbonate is poor.According to observed core,well-logging analysis combined with seismic attribute extraction,we illustrate the characteristics and distribution of vugular in the Yingshan Formation carbonate reservoir of Tazhong area and discuss its controlling factors.The vugs are relatively developed,but the most of them are distributed under the top of Yingshan Formation 120m,and the vug formation is different between different well areas.Middle and small size vug is overlying in vertical,favorable horizon and bedding in horizontal and wide in plane,with relative strong aeolotropism and crossing layer in some parts.The vug formation is mainly controlled by mutual actions among lithofacies,interstratal karst,buried karst and fault,especially interstratal karst and buried karst caused the stratigraphic contrast of vug formation.The vugs give the favorable reservoir space for hydrocarbon accumulation in the Tazhong area;it not only composes of vug- and cave-reservoir,but also is an important fissure-pore reservoir.
Key words： Tazhong area; Yingshan Formation; Carbonate; Reservoir; Interstratal karst; Buried karst; Vug.
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