Prospect Analysis For Coal Of Dunmi Fault Zone In Jixi Region

In Jixi region,the Dunmi fault zone is northeast to the Ussuri River,southeast to the China-Russia border,and northwest to Jixi City.From bottom to top,its strata are New Archean,Paleozoic,Mesozoicand Neozoic.Dunmi fault zone is located in the southeastern part of Jiamusi massif and on the Xingkai microplate in the southern part of Nadanhadaling massif which geological structure is intricate.By drawing six diagrams perpendicular to the Dunmi fault zone,the direction of the Dunmi fault and its distribution direction are confirmed(The main body of the fault zone consists of two main faults which are roughly parallel to each other along the 60° northeast direction and both faults are high-angle down-thrown fault that incline to the north-west.).The coal-bearing strata such as the Quaternary,Fujin Formatin and Hulin Formation were deposited on the upper plate of the fault zone.The study area is divided into three depression areas and two fault-break areas.The evolution of the Dunmi fault zone is divided into fault formation period,fault expansion and development period,and fracture extension period.Three main phase types were identified in the target layer unit of the study area: lake phase,fan delta phase and marsh phase.It is further divided into four sedimentary subfacies and eleven sedimentary microfacies that the sedimentary facies model of this area is established,and the distribution characteristics of the sedimentary facies belts of the Fujin Formation and the Hulin Formation are restored.During the development period of the Hulin Formation,the study area was divided into independent sedimentary deposits and the source of the material was mainly north-south supply,and a set of fan delta-swamp-bin shallow lake sedimentary system supplemented by east and west supply.During the development period of the Fujin Formation,the west side of the study area was deposited,and the east side was uplifted and denuded and it formed a set of fan delta-swamp-bin shallow lake sedimentary system with the supply of east and west sources as the main source.According to the characteristics of stratum development,distribution of sedimentary facies belts and swamp distribution,two favorable exploration which are eastern Jidong Basin and Western Xingkai Fault Depression are predicted in the prediction areas of Fujin Formation,and three favorable exploration which are eastern Jidong Basin,Xingkai Fault Depression and Hulin Basin are are predicted in the prediction areas of Hulin Formation.The eastern part of Jidong Basin and the western part of Xingkai Fault Depression are two priority exploration and prediction areas and Hulin Basin and Eastern Xingkai Fault Depression are two secondary exploration and prediction areas.