鄂尔多斯盆地镇泾地区延长组8段致密砂岩储层特征及主控因素

doi:10.11743/ogg20150208

摘要/Abstract

摘要： 鄂尔多斯盆地西南部镇泾地区延长组长8油层组是典型的致密砂岩储层，具有低孔低渗的特点。通过对其20余口井的岩心观测、测井和录井分析，结合显微镜、铸体薄片及电子显微镜观察等手段，配合储层岩石学、沉积学的分析，认为镇泾地区D工区砂岩以岩屑长石砂岩为主，并且含有少量的长石岩屑砂岩。沉积相以辫状河三角洲亚相为主，其中以水下分流河道微相储层物性最好，可提供最有利的油气聚集空间，河口坝微相物性次之，亦可作为储层的有利区域。通过分析储集物性与砂岩粒度之间的关系，认为中砂岩具有最好的储集物性。通过对研究区成岩机理的研究，认为影响砂岩储层的主要成岩作用为压实作用、胶结作用以及溶蚀作用。压实作用为破坏性的成岩作用，使该区砂岩储层的孔隙度和渗透率减少，埋深2 400 m以上孔隙度小于10%；胶结作用具有正反两个方面的成岩作用，既可通过胶结物的生成减少岩石的孔隙，又可通过抑制压实作用的进一步进行从而保持颗粒间的距离；溶蚀作用为建设性的成岩作用，尤其是深部储层中两期溶蚀作用的发生，使孔隙度得以改善，从而使油气的储集和运移变得更加有利。

关键词: 沉积相, 成岩作用, 储层物性, 延长组, 镇泾地区, 鄂尔多斯盆地

Abstract: The Yanchang Formation in Zhenjing area,southwestern Ordos Basin,contains typical low-porosity and low-permeability tight sandstone reservoirs.Core observation and logging data analyses of more than 20 wells drilled in the reservoirs were combined with experimental means like microscope and scanning electronic microscope to study the litho-logy and sedimentology of the reservoirs.Results show that the rocks are mainly lithic～arkoses with small amount of feldspathic litharenites.Sedimentary facies are dominated by the subfacie of braided fluvial delta,of which the microfacies-underwater distributary channel and mouth bar-have the best and second best petrophysical properties for hydrocarbon pooling.Analyses of relationship between reservoir physical properties and grain size of sandstone indicate that sandstone is the best in terms of reservoir physical properties.Diagenesis study of the area shows that three factors had played critical roles,namely compaction,cementation and dissolution.Compaction caused porosity(and permeability)of the rocks to decrease to less than 10% at a depth deeper than 2 400 m.Cementation was both destructive and constructive in that it reduced porosity of the rocks but meanwhile it also restrained further compaction and kept the particles apart.Dissolution was favorable for reservoir physical properties as the porosity was greatly improved during two stages of dissolution in deep reservoirs.

Key words: sedimentary facies, diagenesis, physical property of reservoir, Yangchang Formation, Zhenjing area, Ordos Basin

中图分类号:

TE122.2

徐梦龙,何治亮,尹伟,等. 鄂尔多斯盆地镇泾地区延长组8段致密砂岩储层特征及主控因素[J]. 石油与天然气地质, 2015, 36(2): 240-247. doi: 10.11743/ogg20150208 Xu Menglong,He Zhiliang,Yin wei,et al. Characteristics and main controlling factors of tight sandstone reservoirs in the 8^th member of the Yanchang Formation in Zhenjing area, Ordos Basin[J]. Oil & Gas Geology, 2015, 36(2): 240-247. doi: 10.11743/ogg20150208

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