石油实验地质2017，Vol.39Issue(4)：484-490,7.DOI:10.11781/sysydz201704484
鄂尔多斯盆地红河油田长8油层组致密砂岩储层"甜点"成因机制
Forming mechanisms of reservoir "sweet spots" in tight sandstones of Chang8 Formation, Honghe oil field, Ordos Basin
摘要
Abstract
Reservoir "sweet spots" (that is, relatively high quality reservoirs) exist locally in the low-permeability, tight sandstone reservoirs of Chang8 Formation in the Honghe oil field, controlling hydrocarbon enrichment and production.This reservoir provides evidence and direction for prediction of tight sandstones to study their forming mechanisms.The impacts of sedimentation, diagenesis, fracturing and oil emplacement on reservoir quality of the tight sandstones during the whole reservoir evolution process from sedimentary construction to diagenetic reformation were systematically analyzed using rock sections, casting thin sections, cathode-luminescence, scanning electron microscopy, micro fluorescence observations and statistics, combined with the analyses of mineral composition, volume of cementation minerals and reservoir physical tests.The results indicate that sedimentation is the most important factor controlling tight sandstone reservoir properties by providing a material basis and controlling the original properties of tight sandstones.Diagenesis is another factor which controls the porosity evolution of tight sandstones, and construction diagenesis controls the formation of reservoir "sweet spots" in tight sandstones and the distribution of "sweet spots" in pore-type tight sandstone reservoirs.The superimposed reformation of structural fractures improves the reservoir properties of tight sandstones, especially the permeability, resulting in the distribution of "sweet spots" in fractured tight sandstone reservoirs.Oil emplacement inhibits cementation as one of the important mechanisms of "sweet spot" preservation in the tight sandstone reservoirs.关键词
储层"甜点"/沉积作用/成岩作用/油气侵位/长8油层组/红河油田/鄂尔多斯盆地Key words
reservoir "sweet spot"/sedimentation/diagenesis/oil emplacement/Chang8 Formation/Honghe oil field/Ordos Basin分类
能源科技引用本文复制引用
王付斌,尹伟,陈纯芳..鄂尔多斯盆地红河油田长8油层组致密砂岩储层"甜点"成因机制[J].石油实验地质,2017,39(4):484-490,7.基金项目
国家科技重大专项"中西部重点碎屑岩层系油气富集规律与勘探方向"(2016ZX05002-006)资助. （2016ZX05002-006）
