Study On The Characteristics Of Stratigraphic-structural Composite Traps In The Carboniferous In Eastern Sichuan

The proved reserves and the yearly output of carboniferous gas pool is the first place in Sichuan basin.And it is the main layer system to increase production in future. According to the third resource evapuation of Sichuan basin,the undiscovered possible is 4859.54×108m3 in East Sichuan basin,main occurrence non-convex trap and stratigraphic-structural combination trap.In this paper, based on the new drilling geology,Iogging, seismic data and previous research results, researchde the Carboniferous stratigraphic-structural combination traps. According to the lithological and electrical characteristics of the huanglong formation can be divided into C2hl1, C2hl2 and C2hl3. Huanglong formation sedimentary facies mainly evaporation tableland, limited platform, open platform. The evaporation platform developed in the first member of huanglong formation(C2hl'), the limited platform developed in the second member of huanglong formation(C2hl2), the open platform developed in the third member of huanglong formation(C2hl3).Huanglong formation of Carboniferous reservoirs in longitudinal section with different degrees of development. Relatively speaking, the huanglong formation, accounted for most of the second member, followed by three and first member only scattered. Huanglong reservoir is mainly distributed in the middle and the bottom of second member.The Carboniferous reservoirs with low porosity and low permeability reservoir. The Carboniferous reservoir is Widely distributed.So the key is to find effective traps.Through the Anatomy of gaodupu trap, we determined in the study area has the conditions to formed stratigraphic-structural combination traps, and ascertained the position of stratigraphic-structural combination traps and Stratigraphic traps. In the 12 tectonic zone were found 82 combination traps, and included 67 stratigraphic-structural combination traps.Through the evaluation of stratigraphic-structural combination traps, determined seven combination traps.They are shizitan-goux?shaguanping-yongan?nanmenchang-tuanlingpo? huangnitang-westlonganchang?huangnitang-shuangguitang?nanmenchang-shanzi shan Banqiao-yaotan. This paper provided some theoretical support for further exploration and development of Carboniferous gas pool in East Sichuan.