轮古7区块奥陶系中下统沉积储层研究

Study on Middle-Lower Ordovician sedimentary reservoirs in Block Lungu 7

根据轮古7区奥陶系中下统钻井岩心的宏观、微观特征,结合测井、物性等资料研究了该套地层的沉积相展布、类型和储层发育特征,对储层按储集空间的差异作了分类。研究表明,该区块沉积环境为开阔台地相,主要沉积砂屑滩,滩间海呈透镜体形式出现。储层可分为4个大类,次生的溶孔、溶洞是主要的储集空间,有效储层主要发育在表层岩溶带和垂直渗流岩溶带内。

Based on the macroscopical and microcosmic features of drilling cores of Middle-Lower Ordovician and combined with the logging and physical property data in Lungu 7 area, this paper studied the distributions and types of the sedimentary facies and reservoir development features in the area. The study result shows that the sedimentary environment is open platform facies in this area, The main sediment is arene beach. The interbank sea presents as lenticular body. The reservoir can be divided into four types. The secondary emposieu, dissolved cavern are main reservoirs. The valid reservoirs were developed in surface karst zone and vertical vadose karst zone.