Reservoir Evaluation Of The Yingcheng Formation Volcanics In Xujiaweizi Fault Depression Of The Northern Songliao Basin

The essay do a detailed research on the reservoir evaluation of the Yingcheng formation volcanics ,based on the volcanic core ,log dates,petrographic thin section ,assays and actual well productivity dates ,as well as,based on the seismic data and well-log information of Yingyi section in Xujiaweizi fault depression of the northern Songliao basin.Firstly,the essay analyse the characteristic of the volcanic lithology ,volcanic facies and the space of the reservoir through the observation and description of the volcanic core.By the research on all the characteristcs of the reservoir volcanics,than,it go into depth researching to find out what is an important element which affects reservoir parameters of property ,what is the interrelation of the elements and the characteristic of micropore structure.Finally,it has got the purprose of the reservoir evaluation by evaluating reservoir volcanics and comparison with the well productivity dates .The research can offer the theory supports for the further exploration and development of Xushen gas field.The findings make known that the Yingyi section develops lava and athrogenic rock.The mainly type is embody athrogenic rock,welded pyroclastic rock and alloclastic lava.The volcanecs in this area can be divided into 5 facies and 16 intrafacies.The space of the reservoir volcanics is divided into 3 types including primary porosity and crack,secondary porosity and crack,combined porosity and crack.It is obviously the volcanic lithology and volcanic facies can contorl The reservoir physical property .But the reservoir physical property were primarily dominated by the characteristic of micropore structure.The overwhelming majority of the reservoir volcanics isâ…¢tpye. The volcanics with well space of the reservoir are the spherulite rhyolite,rhyolite and volcanic breccia.Theâ…¢1 type reservoir of volcanics can become to the commercial reservoir by comparison with the well productivity dates .There is a big difference of sedimentary strata.It is not a good reservoir when the tpye isâ…¢2 type.