通南巴地区飞仙关组三段高效气藏成因及勘探方向

通南巴地区飞仙关组三段鲕滩大面积含气,但对气藏如何高效成藏与富集规律认识不清是制约勘探开发的瓶颈。综合利用地质、地球物理等资料,结合构造精细解释及典型高产稳产井解剖,探讨通南巴地区飞仙关组三段高效气藏形成机制,分析其天然气成藏过程,并指出下一步勘探方向。通南巴地区河坝场气田飞仙关组三段高效气藏的形成主要受3个因素的控制:高能鲕滩优质储层是高效气藏形成的基础;通源断裂实现源储有效沟通是高效气藏形成的关键;现今有利构造背景促进高效气藏形成。处于通南巴背斜翼部的通江地区发育飞三段优质鲕滩储层和成排成带的通源断裂,烃源岩和保存条件优越,是近期有望实现高效勘探开发的有利区。

Genesis and exploration direction of high-efficiency gas reservoir in the third member of Feixianguan Formation in Tongnanba area

The oolitic beach in the third member of Feixianguan Formation in Tongnanba area contains a large gas bearing area,but the poor understanding of the rules of efficient accumulation and enrichment restricts its efficient exploration and development.Based on the comprehensive use of the geological and geophysical data,combined with the fine structural interpretation and analysis of the typical high-yield and stable-production wells,the formation mechanism of the high-efficiency gas reservoirs in the third member of Feixianguan Formation in Tongnanba area was discussed,and their natural gas accumulation process were analyzed,finally the direction for future exploration was clarified.The formation of the high-efficiency gas reservoirs in the third member of Feixianguan Formation in Hebachang Gasfield is mainly controlled by three factors.The high-quality reservoir with the high-energy oolitic beach is the base of the formation of high-efficiency gas reservoirs.The effective source-storage communication through the cracks to source rocks is the key to the high-efficient gas reservoir formation.Today’s favorable structural background promotes the high-efficiency gas reservoir formation.Tongjiang area is located at wing of Tongnanba anticline,in which the high-quality oolitic beach in the third member of Feixianguan Formation develops and the faults to source rocks develop in belt and in row,the source rocks and preservation conditions are superior.It is a favorable area that is expected to achieve efficient exploration and development in the near future.