Research on the Forming Stages of Deep Natural Gas Reservoirs in Baimiao Area of Dongpu Depression
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摘要: 白庙地区是东濮凹陷勘探程度较高的含油气区,生气条件十分优越,已发现了Es2下,Es31,Es32,Es33-4 4套主要含油气层系。根据伊利石测年法和包裹体均一温度法综合分析了白庙地区天然气充注历史。研究表明白庙地区天然气主要分两次注入储层,一次为31.4~20.4 Ma,相当于东营组—馆陶组早期,另一次为2 Ma,相当于第四纪以来;第一阶段天然气成藏时期年龄绝大部分落入了剥蚀期年龄(27~17 Ma)段,是天然气藏的最主要形成时期,抬升剥蚀期压力下降,更有利于天然气成藏;第二阶段为2 Ma,相当于第四纪以来,馆陶组沉积以来白庙地区为欠补偿状态,无二次生气过程,一方面前梨园洼陷及葛岗集洼陷继续生气,生成的天然气向白庙构造运移,聚集成藏;另一方面是第一阶段形成气藏的重新调整。白庙地区天然气成藏期总体具有西早、东晚、北早、南晚的特点。Abstract: As the dynamics of oilgas exploration is bigger, many large gas fields has been found in the basin in recently. Biaomiao area is in the eastern of Dongpu depression, which is the exploration degree high oilgas area in Dongpu depression, there are mainly gas in the Baimiao area,some industrial oilgas wells has been found now, the producing gas condition is very superior,it has discovered Es3下,Es31,Es32,Es334 four sets of main oilgas formation. The gas area is smaller in the upper and part bigger in the lower part. The gas in Baimiao are at the top of gas reservoirs with oil hoop. Oil and gas distribution is gas in the upper and oil in the lower part. For oil and gas relation is complicated in Baimiao area,the research on the regulation of oil and gas is very poor and no systematic analysis up to now. It influences the step of gas exploration. The analysis on the formation time of oilgas reservoirs is hot problem, the determination of it helps to recognize the formation regulation of oilgas reservoirs. In recent, there are important progresses in the aspect of the chronology of formation time of hydrocarbon reservoirs.There are many methods, such as illite dating method, homogenization temperatures of fluid inclusion, the formation history of traps, hydrocarbon generated and hydrocarbon expulsed process,and so on.The different method is of different sense. On the basis of illite dating method and homogenization temperatures of fluid inclusion,it is found that the formation time of hydrocarbon reserviors exist mainly two stages in Baimiao area of Dongpu depression. One is about 31.4~20.4 Ma, which is corresponding to sedimentary period of Dongying FormationEarly period of Guantao Formation.The other is from 2 Ma to now, corresponding to Quaternary to now. In the first stage, a great majority of the formation age of natural gas reserviors distribute in the denudation period from 27 Ma to 17 Ma,which is the main formation time. The decreasing of pressure in the denuded period help to formation of oil and gas reserviors. In the second stage,from 2 Ma to now, the Baimiao area is in the deficient compensation state since sedimentary period of Guantao formation, the area having not second process of generating gas. on the one hand, Qianliyuan depression and Gegangji depression continue producing gases, which migrate to the Baimiao area; on the other hand, the gas reserviors formed in the first stage is adjusted again. Gas in this stage comes mainly from the second time gas of Qianliyuan depression and Gegangji depression. The faults are important to control the formation time of oilgas reservoirs, the formation time in different area is very different. The Biaomiao area is divided into two forming oilgas reservoirs by Duzhai fault. The formation time of oilgas reservoirs is earlier in West area and later in East area. In vertical order,the formation time of oilgas reservoirs is earlier in old position and later in new position. In general, the characteristics of the formation time of the natural gas reserviors in Baimiao area is earlier in the west area and later in the east area, earlier in the north area and later in the south area. The results are important for the deep exploration in Dongpu depression.
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Key words:
- Dongpu depression
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