The Study Of Sedimentary Microfacies And Subtle Reservoir Of Es2 In Wangxianzhuang Fault Zone

Wangxianzhuang Fault Zone,located in the south-east of Wenan Slope,is an important oil-producing area.Recently,the high oil-production in Es2 is be found in Well S89,Well 89-1,Well S89-2 and so on.The good exploration prospect of Es2 is be shown in Wangxianzhaung Fault Zone based in the high hydrocarbon-producing well.And Wangxianzhuang Fault Zone is an oilfield construction zone of Es2 in Wenan Slope.But the water-oil interface of Es 2 reservoir in well such as S89 is very disunity,sand connectivity is uncertain,and the cognition of sedimentary facies is fuzzy,all these severely restraint the effectiveness of progressive development.In this essay,guided by theory stratigraphy sequence and high resolution stratigraphy sequence,based on core observation and description,integrated application with cutting logging,logging data,applied seismic attributes and seismic inversion of geophysical data,and at the same time used geological and geophysical information integration theory and technology,we make reservoir types clear on the base of analysis of all the production wells in study area,and come up with prospect oil trap of Wangxianzhuang fault Zone in Es2 based on all these,conclusions are archived as follows:1.One third-order sequence,three system tracts and five para-sequence sets are divided in Es2 of Wangxianzhuang Fault Zone guided by theory stratigraphy sequence and high resolution stratigraphy sequence,integrated application with well drilling,cutting logging,logging data and core data as well as by using three-dimensional seismic data covering the whole area.2.Two types of sub-facies are identified in the study area,including delta plain and delta front intrafacies,by observing rock core,analyzing the lithologic compages and logging curves,the data of rock slice and grain size distribution curve.Furthermore,six kind of microfacies are identified,namely distributary channel,inter-channel area,natural levee,underwater distributary channel,underwater distributary interchannel and subsea natural barrier.The criteria identifying the sublayer sedimentary microfacies units are worked out,and sublayer sedimentary micro facies plan views are mapped based on composite analysis of logging lithologic facies,curve morphological facies and geologic microfacies.3.There are mainly structural-stratigraphic trap,stratigraphic trap and lithologic trap in study area.Combined with trap characteristic,in study area currently existing oil-producing area mainly are structural-stratigraphic reservoir and stratigrahic reservoir,and structural-stratigraphic reservoir is mainly controlled by antithetic fault,stratigrahic reservoir by unconformilty.Combined with trap and reservoir characteristics,two favorable exploration zones are proposed in study area.