The Fracture Prediction And Natural Gas Accumulation Conditions Analysis In The Yingcheng Formation Of Sheng Ping Area

The main reservoir of the nature gas accumulation,which is in the Yingcheng Formation of Shengping area,its volcanic rock lithology, physical characteristics and the distribution of natural gas is very complex,and the gas production ability of the volcanic rock reservoir is very closely related to the degree of the fracture development, the development of gas field is badly in need of fine volcanic rock reservoir fracture development and the research result of the gas accumulation analysis. Through the Intensive study of the natural fracture development characteristics in the Shengping area, the analysis of the MVE stress, the 3d seismic data crack prediction and the formation conditions of the gas accumulation,the result shows that the study area mainly developed construction seam, tension crack and mesh seam, then bolt. Most natural fractures are filled and halfly filled,only a few of them are open,the effective length of reservoir is mainly composed of big fractures,low fractures and high angle fractures. To observe microfacture in the microscopic,there always exists tension fracture and net fracture. The development direction of Natural fracture is mainly in NW and nearly EW direction next. The type of reservoir space is mainly of structural fracture,pore, rock intergranular pore of the faultage,To compose fracture-pore reservoir,the distribution of the reservoir ’s space has Strong heterogeneities. The pore and Fracture-developed zone in this area is sensitive to the resistivity,density and the refection of the absorption coefficient,to deal with this three attributes we gain aggregate datas and analyze them,we find that the prediction of the fracture developing area has good coherence to the already known drilling results.The research area has abundant gas reservoir,such as volcanic rocks Faulted anticline gas reservoir,volcanic layer Overlapping compound gas reservoir and structure-lithology reservoir.The gas reservoir of Shengping area mainly develops fracture accumulation system,including deep fracture,deep volcanic rock pattern which is under the control of the fault and the fracture,and the sandstone gas reservoir accumulation mode which is as the upper part of the migration channel.