十屋断陷火石岭组—营城组沉积微相研究与储层识别
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摘要
通过分析LS1、SN10等20多口井的岩心、测井、沉积微相和740km2三维精细地震相认为,十屋断陷深层营城组、沙河子组和火石岭组上段半深湖—深湖相十分发育,随深度和层位差异,湖相泥岩和储层砂岩均呈强弱不同的两种地震反射特征和分布特征。储层砂岩以扇三角洲分流河道和浊积扇席状砂为主。扇三角洲在平面上主要分布在断陷北部、东北部和东南部,纵向上主要发育于营城组。由于与其相间的半深湖—深湖泥岩速度低,形成强反射,砂岩则为中弱振幅反射,平面上呈扇状、分支状河道组合或线状单河道展布。浊积扇平面上主要分布于断陷南部的深陷带周围,纵向上主要发育于沙河子组和火石岭组上部。浊积扇上下的泥岩由于厚度大且岩性单一,形成大套弱振幅—空白反射,浊积扇砂体则为薄的中—强振幅前积反射,前积体由多期朵叶组成。扇三角洲和浊积扇的物源来自断陷北部、东北部和东南部。深层油气显示十分普遍,这种储层识别和预测结果对于在该区寻找中大型气藏具有重要的意义。
It is considered by analyzing cores, logging data and sedimentary micro-facies from more than 20 wells such as LS1 and SN10 et al and seismic facies from 740km2 area of 3D fine seismic data that there is well-developed semi-deep-deep lake facies in upper segment of Yingcheng Stage, Shahezi Stage and Huoshiling Stage in deep of Shiwu fault depression. Two different kinds of seismic reflectance signature and distribution all appear in lake-facies mudstone and reservoir sandstone along with the difference of depths and horizons. The reservoir sandstone is mainly fan delta distributary channel and turbidite fan sheet sand, in which the distribution of fan delta is mainly in northern, northeastern and southeastern parts of fault depression laterally and in Yingcheng Stage vertically, forming strong reflections because of lower velocity of interfacial semi-deep-deep lake facies mudstone; the distribution of sandstone is fan-like and branch-like channel composition or linear single channel laterally, forming mid-to-weak reflections. The distribution of turbidite fan is mainly around the deep depression in the southern part of fault depression laterally and in upper part of Shahezi Stage and Huoshiling Stage vertically. The mudstone in upper or lower turbidite fan is characterized by larger thickness and single lithology forms a large set of reflections with weak amplitude or reflection-free, the turbidite fan sand body is characterized by thin and mid-to-strong foreset reflections and the composition of foreset body is multi-stage lobes. The source area of fan delta and turbidite fan comes from northern, northeastern and southeastern parts of fault depression. The deep hydrocarbon show is very popular, and these results of reservoir recognition and prediction have important meaning for looking for larger-scale gas reservoir in the region.
It is considered by analyzing cores, logging data and sedimentary micro-facies from more than 20 wells such as LS1 and SN10 et al and seismic facies from 740km2 area of 3D fine seismic data that there is well-developed semi-deep-deep lake facies in upper segment of Yingcheng Stage, Shahezi Stage and Huoshiling Stage in deep of Shiwu fault depression. Two different kinds of seismic reflectance signature and distribution all appear in lake-facies mudstone and reservoir sandstone along with the difference of depths and horizons. The reservoir sandstone is mainly fan delta distributary channel and turbidite fan sheet sand, in which the distribution of fan delta is mainly in northern, northeastern and southeastern parts of fault depression laterally and in Yingcheng Stage vertically, forming strong reflections because of lower velocity of interfacial semi-deep-deep lake facies mudstone; the distribution of sandstone is fan-like and branch-like channel composition or linear single channel laterally, forming mid-to-weak reflections. The distribution of turbidite fan is mainly around the deep depression in the southern part of fault depression laterally and in upper part of Shahezi Stage and Huoshiling Stage vertically. The mudstone in upper or lower turbidite fan is characterized by larger thickness and single lithology forms a large set of reflections with weak amplitude or reflection-free, the turbidite fan sand body is characterized by thin and mid-to-strong foreset reflections and the composition of foreset body is multi-stage lobes. The source area of fan delta and turbidite fan comes from northern, northeastern and southeastern parts of fault depression. The deep hydrocarbon show is very popular, and these results of reservoir recognition and prediction have important meaning for looking for larger-scale gas reservoir in the region.
引文
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[3]王果寿.松辽盆地十屋—德惠地区沉积体系特征.石油与天然气地质,2001,22(4):331~336
[4]解习农,焦赳赳,熊海河.松辽盆地十屋断陷异常低压体系及其成因机制.地球科学,2003,28(1):61~66
[5]何生,陶一川,姜鹏.利用多种古地温计研究松辽盆地东南隆起区的地热史.地球科学,1995,20(3):328~334
[6]王果寿,陈振林,吴金才.松辽盆地南部白垩系下统地震相及沉积体系.江汉石油学院学报,1995,17(4):12~18
[7]蒲仁海.断陷湖盆层序地层学几点进展.石油与天然气地质,2002,23(4):410~414
[8]孙连浦,刘招君,李木才等.水下扇岩相特征及形成机制.世界地质,2001,20(3):249~256
[9]Mcpherson J G et al.Fan-deltas and braided deltas.Geol Soc Amer Bull,1987,99:331~340
[10]Brown A R.Interpretation of 3-D seismic data.AAPGMemoir42(5th edition),1999,97~188
[11]Cross T A,Lessenger M A.Sedi ment volume parti-tioning rationale for stratigraphic model evaluationand high-resolution stratigraphic correlation.In:Grad-stein F M,Sandvik K O,Milton N J eds.SequenceStratigraphy Concepts and Applications.SPE Spe-cial Publication,1998,8:171~195
[12]蒲仁海.前积反射的地质解释.石油地球物理勘探,1994,29(4):490~497
[13]陆邦干.中国典型地震剖面图册.北京:石油工业出版社,1989,78~114
[14]Scholz C A,Rosendahl B R,Scott D L.Developmentof coarse-grained facies in lacustrine rift basins,ex-ample from East of America.Geology,1990,18(2):140~144
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