The Favorable Traps Comprehensive Evaluation Of Shahejie Formation To Kongdian Formation In Yesanbo Oilfield

Yesanbo oilfield is located in the Duanliubo township of the Nanpi country inHebei Province. It lies in the south of the Shenvsi faulted nose structure of theCangdong skirit tectonic zone in the south of the Huanghua Depression, theexploration area is about120km2. Because of the complex formation of oil and gasaccumulation, the shallow structure underground is not easy to identified, the deepsubtle reservoir, remaining resources, favorable structure, reservoir, capacity. Thus itneed to expand scope of the study and make further research work.Based on the research and seismic data of the former expert, the structuralfeatures and fracture distribution characteristics can be obtained, then analysis thecondition of oil source, reservoir, seal, trap, gathering, storage. Finally the masterfactors of the accumulation can be revealed, and get the index factors and weights ofthe trap evaluation, then select the traps in order. This paper mainly make acomprehensive evaluation from the structural shape, structural position, trap area,fault seal, trap hydrocarbon, and forecast the favorable zone to guide the nextexploration.The main results that get from the paper are as follows:1. The study area is controlled by two faults, mainly by the northeast fault,43fault whose length exceed1km can be obtained. The traps is about132, the area is77.05km2.2. The area have a better source rock, mainly from the dark mudstone of thesecond member of Kongdian formation and mudstone of the third member of Shahejieformation. The sandstone of Kongdian formation and Shahejie formation build thereservoir. The rock types may contain arkose, litharenite, have a better reservoirproperties, and the remnant native intergranular pore.3. Accourding to the master factors of the accumulation, evaluation traps weightcan be obtained. Then10favorable traps of the ten horizon can be obtained, and make a queue.They are the13th trap of Zao4group,3rd trap of Zao0group of the firstmember of Kongdian formation, the6th trap of the second member of Shahejieformation, the9th trap of Zao2group of the first member of Kongdian formation, the5th trap of Zao4group of the first member of Kongdian formation, the11th trap ofZao2group of the first member of Kongdian formation, the4th trap of the secondmember of Kongdian formation, the20th trap of Zao4group of the first member ofKongdian formation, the5th trap of Zao0group of the first member of Kongdianformation, the1st trap of second member of Shahejie formation.4. For the10selected traps, through a comprehensive evaluation from thestructure, reservoir-cap, sedimentary, accumulation, and finally select the5best areain order. They are the13th trap of Zao4group,3rd trap of Zao0group of the firstmember of Kongdian formation, the6th trap of second member of Shahejie formation,the5th trap of Zao4group of the first member of Kongdian formation, the11th trapof Zao2group of the first member of Kongdian formation.