东胜气田锦58井区盒3段沉积特征
|
摘要
为了明确鄂尔多斯盆地东胜气田锦58井区下二叠统下石盒子组盒3段沉积特征、砂体纵横向展布特征,指导该区后续的天然气开发,以锦58井区测井、录井、岩心观察以及岩石薄片、粒度分析等资料为研究对象,系统分析了该区盒3段泥岩颜色、矿物组成、颗粒结构、沉积构造、粒度特征、测井相类型等,建立了单井沉积相综合柱状图,并刻画了砂体纵横向展布特征。研究结果表明:①该区盒3段沉积时期泥岩为红褐色、棕褐色;②岩性以岩屑砂岩、长石岩屑砂岩为主;③砂岩颗粒磨圆度较差、分选中等;④发育块状层理、交错层理、水平层理、平行层理、冲刷面等典型沉积构造;⑤C-M图划分为PQ、QR、RS三段,粒度概率累积曲线呈典型的两段式或三段式;⑥测井相以光滑箱形、齿化箱形、钟形、线形为主。结论认为,该区为近物源的辫状河沉积,发育心滩、辫状水道、河漫沉积微相,其中心滩砂体厚度大,以粗—中砂岩为主。结合沉积微相纵横向展布特征,盒3段以辫状水道和心滩沉积为主,砂体较发育,纵向上呈"砂包泥"的特点,平面上盒3-1沉积期辫状河发育规模明显大于盒3-2沉积期。
In order to figure out the sedimentary characteristics and the vertical and lateral distribution characteristics of sand bodies of He 3 Member in Well block Jin 58 of Dongsheng Gasfield so as to provide the guidance for its subsequent development, the log,mud log, core observation, thin section analysis and grain size analysis data of Well block Jin 58 were taken as the research object in this paper. The mud colors, mineral compositions, grain structures,sedimentary structures, grain size characteristics and electrofacies types of He 3 Member in this well block were analyzed systematically. In addition, the composite column of single well sedimentary facies was plotted and the vertical and lateral distribution characteristics of sand bodies were characterized. And the following research results were obtained. First, during the deposition of He 3 Member, the mudstones are reddish brown and chocolate brown,the lithology is dominated by lithic sandstone and feldspathic litharenite, the sandstone grains are poorly rounded and moderately sorted, and the typical sedimentary structures are developed in this well block, e.g. massive bedding, cross bedding, horizontal bedding,parallel bedding and scour surface. C-M diagram is divided into three sections, i.e., PQ, QR and RS, the cumulative curve of grain size probability is in the typical pattern of two or three sections, and the electrofacies is presented mainly in the shape of smooth box,toothed box, bell and line. Second, proximal braided river is mainly developed in this well block, and the sedimentary microfacies of point bar, braided channel and flood plain are developed. Among them, the sand bodies of point bar are thick and mainly composed of coarse-moderate sandstones. Third, based on the vertical and lateral distribution characteristics of sedimentary microfacies, it is concluded that the deposits of He 3 Member are dominated by braided channel and point bar and its sand bodies are relatively developed, vertically presenting the characteristics of"mudstone in sandstone". And in plane, the development scale of braided river during the deposition of He 3-1 Member is obviously larger than that during the deposition of He 3-2 Member.
In order to figure out the sedimentary characteristics and the vertical and lateral distribution characteristics of sand bodies of He 3 Member in Well block Jin 58 of Dongsheng Gasfield so as to provide the guidance for its subsequent development, the log,mud log, core observation, thin section analysis and grain size analysis data of Well block Jin 58 were taken as the research object in this paper. The mud colors, mineral compositions, grain structures,sedimentary structures, grain size characteristics and electrofacies types of He 3 Member in this well block were analyzed systematically. In addition, the composite column of single well sedimentary facies was plotted and the vertical and lateral distribution characteristics of sand bodies were characterized. And the following research results were obtained. First, during the deposition of He 3 Member, the mudstones are reddish brown and chocolate brown,the lithology is dominated by lithic sandstone and feldspathic litharenite, the sandstone grains are poorly rounded and moderately sorted, and the typical sedimentary structures are developed in this well block, e.g. massive bedding, cross bedding, horizontal bedding,parallel bedding and scour surface. C-M diagram is divided into three sections, i.e., PQ, QR and RS, the cumulative curve of grain size probability is in the typical pattern of two or three sections, and the electrofacies is presented mainly in the shape of smooth box,toothed box, bell and line. Second, proximal braided river is mainly developed in this well block, and the sedimentary microfacies of point bar, braided channel and flood plain are developed. Among them, the sand bodies of point bar are thick and mainly composed of coarse-moderate sandstones. Third, based on the vertical and lateral distribution characteristics of sedimentary microfacies, it is concluded that the deposits of He 3 Member are dominated by braided channel and point bar and its sand bodies are relatively developed, vertically presenting the characteristics of"mudstone in sandstone". And in plane, the development scale of braided river during the deposition of He 3-1 Member is obviously larger than that during the deposition of He 3-2 Member.
引文
[1]周家林.东胜气田锦58井区盒1段岩相特征及沉积模式研究[J].石油地质与工程,2018,32(4):1-5.
[2]荀小全.东胜气田锦58井区盒1段储层特征及分类评价[J].天然气技术与经济,2018,12(5):9-11.
[3]兰俊.杭锦旗地区独贵加汗圈闭盒3段储层特征及评价[J].石油地质与工程,2016,30(3):5-8.
[4]孙朋浩,吴天琦,田继军,等.松辽盆地南部民东地区扶余油层沉积特征及沉积模式研究[J].西部探矿工程,2016(10):57-59.
[5]郝守翠.垦东12块馆上段河流相沉积特征及模式[J].中国石油大学胜利学院学报,2018,32(3):7-10.
[6]杜永慧,李晓路,韩小琴,等.鄂尔多斯盆地东南部山西组沉积特征[J].东北石油大学学报,2017,41(3):44-51.
[7]崔宏俊,刘宝平,欧阳畹町.鄂尔多斯盆地延长气田石盒子组沉积特征分析[J].西安科技大学学报,2012,32(6):726-731.
[8]王勇,徐晓蓉,付晓燕,等.苏里格气田苏6井区上古生界沉积相特征研究[J].西北大学学报:自然科学版,2007,37(2):266-272.
[9]李永杰,赵荣华.鄂尔多斯盆地杭锦旗地区上古生界储层自然伽马测井相研究[J].石油地质与工程,2014,28(2):61-63.
[10]杨忠亮,田景春,张翔.鄂尔多斯盆地大牛地气田盒3段沉积微相研究[J].断块油气田,2012,19(2):149-153.
[11]张勇,国景星.辫状河心滩特征及其与河道充填的识别:以大芦家地区馆三段为例[J].石油天然气学报,2011,33(10):25-29.
[12]张会卿.辫状河沉积储层内部构型研究在港东一区的应用[J].新疆石油天然气,2016,12(2):6-9.
[13]叶超,邓攀,任振华,等.苏里格气田苏54区块盒8段沉积相特征研究[J].天然气技术与经济,2015,9(3):22-25.
[2]荀小全.东胜气田锦58井区盒1段储层特征及分类评价[J].天然气技术与经济,2018,12(5):9-11.
[3]兰俊.杭锦旗地区独贵加汗圈闭盒3段储层特征及评价[J].石油地质与工程,2016,30(3):5-8.
[4]孙朋浩,吴天琦,田继军,等.松辽盆地南部民东地区扶余油层沉积特征及沉积模式研究[J].西部探矿工程,2016(10):57-59.
[5]郝守翠.垦东12块馆上段河流相沉积特征及模式[J].中国石油大学胜利学院学报,2018,32(3):7-10.
[6]杜永慧,李晓路,韩小琴,等.鄂尔多斯盆地东南部山西组沉积特征[J].东北石油大学学报,2017,41(3):44-51.
[7]崔宏俊,刘宝平,欧阳畹町.鄂尔多斯盆地延长气田石盒子组沉积特征分析[J].西安科技大学学报,2012,32(6):726-731.
[8]王勇,徐晓蓉,付晓燕,等.苏里格气田苏6井区上古生界沉积相特征研究[J].西北大学学报:自然科学版,2007,37(2):266-272.
[9]李永杰,赵荣华.鄂尔多斯盆地杭锦旗地区上古生界储层自然伽马测井相研究[J].石油地质与工程,2014,28(2):61-63.
[10]杨忠亮,田景春,张翔.鄂尔多斯盆地大牛地气田盒3段沉积微相研究[J].断块油气田,2012,19(2):149-153.
[11]张勇,国景星.辫状河心滩特征及其与河道充填的识别:以大芦家地区馆三段为例[J].石油天然气学报,2011,33(10):25-29.
[12]张会卿.辫状河沉积储层内部构型研究在港东一区的应用[J].新疆石油天然气,2016,12(2):6-9.
[13]叶超,邓攀,任振华,等.苏里格气田苏54区块盒8段沉积相特征研究[J].天然气技术与经济,2015,9(3):22-25.