拟测井速度在丹凤场构造阳新统气藏勘探中的应用

Application of Pseudo Logging Velocity to Exploring the Yangxin Gas Rrservoir in Danfengchang Structure

本文通过拟测井、钻井等资料的对比、分析.提出丹凤场构造二叠系阳新统速度变化的原因,是由于缝洞岩体及其含流体的差异所造成;低速区是以微裂缝为主的含气裂缝圈闭区,中～高速区和断层密集带岩性致密,不利聚气。对过去用瞬时相位剖面解释的众多小断层也提出了异议。

Through contrast and analysis of the data of pseudo logging and drilling. etc., It is proposed in this paper that the reason for the change of velocity in Yangxin Series of Permian in Danfengchang struc- ture is due to the differcnce between the vuggy-fractured rock and the fluids contained in it, lower velocity area is the gas-bearing fractured trap being mainly micro fissurcs but middle-high velocity and fault-concentrated areas are not favourable for gas accumulation because of lithologic dcnsification. The author also raises an objection for the numerous little faults interpreted by use of transient phase sections in the past.