Research On Characteristics And The Reservoir Control Of Volcanic Rock Weathering Crust In The Ky Formation Of The Xujiaweizi Fault

In this thesis,we make use of the faulted outcrops,cores,laboratory analysis,well logs,seismic data,Integrated Interpretation of xujiaweizi. And it identified the weathered flag of Yingcheng underground volcanic,analyzed systematically K1 y and K3 y sections of Xujiaweizi depression volcanic rock weathering crust which is combined with regional geological background. Through the study of the various wells in the study area typical volcanic core analysis,we has carried out the division for the cycle of volcanic rock weathering crust times with physical properties.On the basis of a single well,the wells and wells and seismic tracking,we detailed portrait of a flat distribution characteristics of each phase of weathering crust,characterizes the thickness of a single plane of the weathering crust with internal hydrolysis dissolution and unweathered rock band spread and discussed the control of volcanic rock weathering crust of volcanic reservoir physical properties.After the end of a cycle of volcanic eruption,it often prolonged intermittent eruption,and olcanic eruption will be subjected to weathering alteration. Volcanic rock will develop secondary holes. A plurality of the drilling has the consistency with the reservoir properties and development of secondary pores of the reservoir. In general,a secondary pore belt will correspond with a few weathered. And you can see two secondary pore zone whose centern is the largest porosity of K3 y.After the volcanic suffered weathering,various elements,In accordance with the migration of content elements will change accordingly. If these changes in the vertical performed periodicity it shows the feature of multi-stage eruption. The volcanic element content has three variation periods in K1 y and two variation periods in K3y:With the change in the depth,the Fe2O3、AL2O3 secondary mineral content will be reduced to baseline values and the Na2O、K2O、SIO2 will be increased to baseline values in the upper part of the cycle. After increases with depth, Fe2O3 、 AL2O3 element content abruptly.