吐哈盆地低断块油藏形成条件与分布规律

FORMATION CONDITION AND DISTRIBUTION LOW FAULT-BLOCK RESERVOIR IN TURPAN-RAMI BASIN

低断决油藏属于特殊类型的隐蔽油藏，其形成需要适当的条件。低断块油藏在吐哈盆地近期的油气勘探和储量增长中具有重要的作用，已找到的低断块油藏数量较多，但特点不一，形成条件各异。研究表明，油气的不断运移是低断块油藏形成的根本原因，而构造变动、异常高压含油气区的存在、长期生排烃、储集层发有较差、油质重调等都可以成为促使油气不断运移长期存在的因素。通过分析低断块油藏特殊的形成条件及不同成因低断块油藏的分布规律，认为在油气勘探过程中应重视对低断块油藏形成的可能性研究。胜北次凹周围低断块油藏勘探有较大的潜力。

Low fault-block reservoir is one of special subile reservoirs. It plays an important role in oil/gas exploration and reserves. The studies showed that oil/gas continuous migration is an important effect on formation of a low fault-block reservoir, and such factors as structural movement, anomaly high pressure, long-term hydrocarbon generation and expelling, bad reservoir and oil with high viscosity can allow oil/gas to be long-term and continuous migration. According to forming condition of low fault-block and distribution of low fault-block reservoirs with different origin, it is considered that feasibility study of the formation of low fault-block reservoir should be paid attention, and it is concluded that low fault-block reservoir around Shengbei subsag has greater potential for hydrocarbon exploration.