摘要
鄂尔多斯盆地奥陶系风化壳气藏自1989年陕参1井发现以后,马家沟组五段风化壳气藏勘探取得了丰硕成果。中央古隆起对富县地区马家沟组沉积和储层的影响,未进行详细的研究,制约了该地区下古生界的油气勘探。通过对富县地区奥陶系马家沟组地层特征、沉积微相、岩溶发育规律的研究,明确了中央古隆起对研究区地层沉积的控制作用以及对岩相、沉积微相展布的影响。研究表明:中央古隆起对富县地区奥陶系马家沟组地层沉积具有继承性,整体厚度表现为北厚南薄、东厚西薄。通过沉积微相特征的研究,古隆起的边缘地区水动力较强,发育呈席状的台内滩、潮缘滩。奥陶系风化壳与中央古隆起的形态、结构、演化与保存密切相关,中央古隆起的形成与演化制约了奥陶系岩溶体系的发育与保存。
Since the discovery of the Ordovician weathering crust gas reservoir in the Ordos Basin in 1989,there has been notable progress in exploring the gas reservoir within the fifth member of the Majiagou Formation.However,the impact of the central paleouplift on the Majiagou Formation's deposition and reservoir characteristics in the Fuxian area remains underexplored.This gap in knowledge hampers oil and gas exploration efforts in the Lower Paleozoic strata of this region.Research into the stratigraphy,sedimentary microfacies,and karst development patterns of the Ordovician Majiagou Formation in the Fuxian area has shed light on how the central paleo-uplift influenced the area's geological deposition.This influence extends to the distribution of lithofacies and sedimentary microfacies as well.Findings indicate that the central paleo-uplift's effects on the Majiagou Formation in the Fuxian area have a legacy,with the formation's thickness varying significantly across different directions-thicker in the north and east,and thinner in the south and west.Further analysis of sedimentary microfacies reveals that the edges of the paleo-uplift were areas of strong hydrodynamic activity,leading to the formation of sheet-like intra-platform and tidal marginal beaches.The development of the Ordovician weathering crust is intricately linked to the central paleo-uplift's shape,structure,evolutionary history,and preservation conditions.The evolution of this uplift played a crucial role in both the development and preservation of the Ordovician karst system.
作者
苏娟
杨飞
张军涛
张涛
刘璐
杨佳奇
SU Juan;YANG Fei;ZHANG Juntao;ZHANG Tao;LIU Lu;YANG Jiaqi(Sinopec Petroleum Exploration and Production Research Institute,Beijing 102200,China;Sinopec North China Company,Zhengzhou,Henan 450006,China)
出处
《油气藏评价与开发》
CSCD
北大核心
2024年第2期297-307,共11页
Petroleum Reservoir Evaluation and Development
基金
中国石化重点科技项目“中西部三大叠合盆地及周缘资源评价”(P23244)。
