Improvement of research method on comprehensive damage degree of regional mudstone cap caused by faults
In order to study the degree of regional mudstone cap of fault failure more accurately,based on the factors affecting the mechanism and degree of regional mudstone cap of fault failure,the research method of regional mudstone cap of fault failure is improved by replacing its displacement pressure with the degree of compacting diagenesis of fault rock and regional mudstone cap.The improved method was applied to study the extent of regional mudstone cover in the lower first member of the Damoguaihe Formation(K1d1x)of F1 fault of Huhenuoren structure,Beier Sag,Hailaer Basin.The results show that both before and after the improvement of the method,it is found that the degree of regional mudstone cover in the K1d1x of F,fracture at measuring point 9 is the largest,and that at measuring point 13 is the smallest,and the rest of the measuring points are between the two.The measuring points from 1 to 8 and from 12 to 15 are conducive to the accumulation and preservation of oil and gas generated in the source rock of the first member of the Nantun Formation(K1n1)and the second member of the Nantun Formation(K1n2)under the regional mudstone cover of the K1d1x,but no oil and gas is found at measuring point 1 to 6.It is due to the low structural position and insufficient oil and gas supply,which is consistent with the oil and gas distribution found in the K1n2 of the F,fault.Although the research results of the improved method have the same variation rule as those of the improved method,their value is relatively large and underestimates the extent of the regional mudstone cover in the K1d1x of the F,fracture failure,indicating that the research results of the improved method may be more consistent with the underground practice and convenient and feasible.
Fracture failureRegional mudstone caprockDegree of damageResearch methods
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