川东北元坝地区须三段钙屑砂砾岩储层特征及控制因素

发布时间：2018-04-22 22:12

本文选题：钙屑砂砾岩储层 + 储层特征　；参考：《石油与天然气地质》2016年04期

【摘要】：四川盆地元坝地区须家河组三段多口井测试获得中-高产工业气流,具有良好勘探开发潜力,但其储层特征及控制因素不明确。利用岩心、薄片及分析化验资料对研究区储层岩石类型、储集空间、物性及发育控制因素进行综合研究。研究认为:储层岩石类型以钙屑砂岩和灰质砾岩为主,具有"石英、长石含量低,碳酸盐岩屑(碳酸盐砾)含量高"的特征。储集空间以粒间溶孔、粒内溶孔及裂缝为主,钙屑砂岩与灰质砾岩储层差异明显。钙屑砂岩为裂缝-孔隙型储层,而灰质砾岩为孔隙-裂缝型储层,物性总体较差,具有低孔、低渗的特征。储层发育主要受沉积微相、岩石类型、溶蚀作用及裂缝共同控制。有利沉积微相及岩石类型是优质储层发育的基础,溶蚀作用及裂缝是优质储层发育的关键。水下分流主河道中-粗粒钙屑砂岩为最有利岩相,高含量钙屑组分在后期溶蚀作用及裂缝改造下易形成优质储层。
[Abstract]:The multi-well test of the third member of Xujiahe formation in Yuanba area of Sichuan Basin obtained medium and high yield industrial airflow which has good exploration and development potential but its reservoir characteristics and controlling factors are not clear. The rock types, reservoir space, physical properties and development control factors of reservoir in the study area were studied by using core, thin slice and analytical data. It is considered that the reservoir rock types are mainly calcareous sandstone and lime-conglomerate with the characteristics of "quartz, low feldspar content and high carbonate lithic (carbonate gravel) content". The reservoir space is mainly composed of intergranular dissolved pore, intragranular dissolved pore and fracture, and the difference between calcareous sandstone and grain-conglomerate reservoir is obvious. The calcareous sandstone is a fissure-pore type reservoir while the lime-conglomerate is a pore-fracture type reservoir with poor physical properties and low porosity and permeability. Reservoir development is mainly controlled by sedimentary microfacies, rock types, dissolution and fractures. Favorable sedimentary microfacies and rock types are the basis for the development of high quality reservoirs. Dissolution and fracture are the key to the development of high quality reservoirs. Medium-coarse grained calcareous sandstone is the most favorable lithofacies in the main channel of underwater distributary.
【作者单位】：中国石化勘探分公司;
【基金】：国家科技重大专项(2016ZX05002-004)
【分类号】：P618.13

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