济阳拗陷内王判镇潜山带奥陶系成藏条件分析

Ore-forming Condition Analysis in Ordovician Wangpanzhen Buried Hill Belt in Jiyang Depression

王判镇潜山带发育白桥、任凤、王判镇3条深大断裂,自北向南分为Ⅰ,Ⅱ,Ⅲ排山,奥陶系圈闭形成时间早于石炭—二叠纪二次生气运聚期。该区火山活动频繁,火成岩广布。奥陶系储集条件好。济阳地堑和曲堤地垒二次生气中心的煤成气对本区贡献不大。Ⅰ,Ⅱ排山中—东北部也为煤成气二次生气中心,具备煤成气气源条件,石炭—二叠系泥岩和铝土质泥岩、灰岩为优质的盖层,是寻找煤成气及其与幔源气混源气的有利场所。Ⅲ排山不具备煤成气气源条件,而具备幔源气气源条件,是寻找幔源气的有利场所。

Baiqiao, Renfeng and Wangpanzhen deep fault belts developed in Wangpanzhen buried hill belt, which can be divided into Ⅰ,Ⅱ,Ⅲ hills from north to south part. Encirclement forming time was earlier than Carboniferous-Dias second gas-forming and concentrating period. Magmatic movement is very frequent in this area and ingneous rocks distribute widely. Ordovician has a good reserve condition, while gas in second gas-forming center of Jiyang fault trough and Qudi horst has little contribution for gas-forming. In Ⅰand Ⅱ hills, northeast part is second gas-forming center, has gas-source condition. Carboniferous-Dias muddy rocks and bauxitic muddy rocks, limestone are good cover, which are favorable areas for looking for gas and mantle source gas and mixed source gas. Ⅲ hill has no gas-source condition, while with gas-source condition is favorable area for looking for mantle source gas.