J3-K1 High Resolution Sequencestratigraphy And Sedimentary Facies Research In Halahatang And Donghetangareas,northernTarim Basin

At present due to all aspects of factors,the Tarim basin of cretaceous research has more concentrated in the Kuche depression.The cause of the phenomenon isthat cretaceous development research in Tarim basin is weak,and in the basin research degree comparatively occur large difference between different tectonic units.Northern uplift is located in forebulge beltand long after the depressionin the Kuche foreland basin,at present the research degree is relatively low,the meet some problem Through outcrop,core,drilling and well logging and seismic data,a comprehensive analysis of o 'hara pond-donghetang region was carried out by high resolution sequence framework and the research of sedimentary facies.Level 3 and level 4 in the pond area established sequence stratigraphic framework,and analyzes the sedimentary system under the framework of time and space evolution rule.In donghetang areas established the sequence stratigraphic framework,and analyzes the sedimentary system under the framework of temporal and spatial evolution.On the basis of carried out the favorable zones of lithologic,stratigraphic trap development forecast.Through a large number of single well analysis and comparison of the Wells,sedimentary system in sequence and system tract recognition,on the basis of summarizing the zone karp ShaLiangQun within the main sequence of system-systems tracts.In general,for SQ2 and SQ3 and SQ4 sequence sequence lowstand normally not development,mainly composed of transgressive systems tracts and high field,lowstand only in SQ1 and SQ5 sequence local part of the show.In the pond area,in order to study the change of the oil and distribution in vertical,according to the sequence stratigraphy research train of thought,in the earthquake-log-on the basis of geological combination of SQ5 further divided into SSQ1,SSQ2,SSQ3 three level 4 sequence;SSQ2 high sand body and assault SSQ3 lake mudstone formation area on good reservoir-cap combination,gas logging show all in SSQ2.In combination with seismic attribute,respectively depicts SSQ1,SSQ2,SSQ3 plan of sedimentary facies,7 wellblock in hot 3-xinken,SSQ2 is given priority to with delta front subaqueous distributary channel deposits,sand body development,SSQ3 with distal and shallow lacustrine delta front is given priority to,especially in the south of the hot 3 wellblock,assemblages are very good.In donghetang formation,SQ1-for SQ2 sand body is given priority to with powder sandstone,sand body are superimposed,between quasi layer,upper and lower are to stabilize the mudstone,the stable distribution within a few tens of kilometers.reservoir-cap combination is better.Shallow-water delta front to ensure the SQ1-for SQ2 sand body and top and bottom mudstone under the condition of basic thickness distribution of large area.The plane distribution of sedimentary facies is the control SQ1-for SQ2 oil and gas in donghetang formation on the basis of distribution factors.