Sedimentary Facies Study Of He 3 Member In Yanglou Area Of Biyang Sag

For the H3 member of Yanglou area,currently it enters into the exploration stage of looking for the lithologic trap of focal sand layer.It needs to construct a high accuracy cyclical sequence stratigraphic framework and to clarify the types and distribution characteristics of sedimentary faces in isochronous stratigraphic unit.Based on the theoretical guidance of Cyclostratigraphy,the model of Punctuated Aggradational Cycle(PAC),Sedimentology,Lithology and Petroleum Geology and the full using of Drilling,Well Logging,logging,Seismic and Laboratory Analysis material.this paper dose a detailed research on the cyclical sequence and sedimentary facies of H3 member ??? oil groups in Young Lou area by combining the method of Macro and Micro,Outdoor and Indoor,Geological and Geophysical,etc.The basic cyclical sequence of Yanglou area matches the model of Punctuated Aggradational Cycle(PAC).Its cyclical level is the sixth and it is the same with the parasequence of Vail stratigraphic sequence.By the orderly superposition of the sixth level cyclical sequences,it turns into two kinds of fifth level cyclical sequences:complex shoaling and complex darken.By the division and the comparison of the connecting-well cyclical sequence,this paper divides H3 member ??? oil groups into 25 sixth level cyclical sequences(sc1-sc25)and 6 fifth level cyclical sequences(SC1-SC6),and then constructed out a high accuracy cyclical sequence stratigraphic framework.It concludes out the development of the Delta and Lake facies of Yanglou area.In specific,the subfacies and microfacies types include distributary channel,interchannel,underwater distributary channel,interdistributary,mouth bar,distal bar,prodelta,shallow lake and deep/semi-deep lake.This paper is the first one that brings out the existence of the Delta sand body formed by ancient provenance in the southwest corner of work area,besides the provenances of Yanglou,Wangji and Fuwan-Zhangchang.By working on the microfacies and sedimentary facies of the core oil groups and sublayers,it is found that the ?,? and ? oil groups are mainly deposited on mouth bar and distal bar.Near by the ? oil group,there-were former Delta and deep/semi-deep lake.And ? oil group particularly develops out distributary channel,interchannel and underwater distributary channel.In general,the ???oil groups show that the sedimentary environment is deepening-upward,and then shoaling-upward.