鄂尔多斯盆地柴窑区长6油层组油气分布规律

Hydrocarbon Distribution Rule of Chang 6 Formation in Chaiyao Block, Ordos Basin

从沉积微相、储层特征、盖层特征以及储盖组合等方面分析了长6油层组油气分布的主要控制因素,得到了研究区油气分布的几点规律。油气的分布主要受沉积微相和储层物性的控制,油气主要分布在水下分流河道沉积环境,孔隙度大于9%,渗透率大于1×10-3μm2的地区。同时盖层的遮挡能力以及储盖组合的配置条件也对油气的分布具有重要的控制作用。油气主要分布在长61油层亚组泥岩盖层发育良好,并且储盖组合良好的地区。

Main control factors of hydrocarbon distribution of Chang 6 formation in this field were analyzed from the aspects of sedimentary microfacies, reservoir characteristics, seal characteristics and reservoir-seal combination, and some rules of hydrocarbon distribution were got. The results show that the distribution of hydrocarbon is mainly controlled by the sedimentary microfacies and reservoir physical property. Hydrocarbon is mainly distributed in the underwater distributary channel with porosity more than 9% and permeability more than 1×10^-3μm^2. Moreover the sealing ability of seal and reservoir-seal combination is also an important factor to control the distribution of hydrocarbon. The mudstone seal development zone in Chang 6^1 formation has good reservoir-seal combination, is the main distribution area of hydrocarbon.