沉积环境复杂地区地层划分对比方法——以鄂尔多斯盆地大牛地气田为例
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摘要
鄂尔多斯盆地大牛地气田主要含气层位是上石炭统太原组和下二叠统山西组、下石盒子组。地层划分对比难度大,主要原因是河流沉积相变快、井网稀、工区大,使用单一的地层划分对比方法效果不好,研究之初现场存在多种认识方案。采用标志层法(引入煤层作为标志层和辅助标志层)、厚度法(相邻井地层厚度相当)、层序地层学法、密井网解剖法(从密井网解剖入手,认识地层变化规律,进而推广到稀疏井网)4种方法相互结合、闭合对比,并应用合成地震记录标定(只针对砂组)和层面建模进行校验,形成了一套沉积环境复杂地区地层划分对比的综合方法,建立了一套新的地层划分对比方案,统一了地层认识,取得了较好的应用效果。
The main gas-bearing horizons in Daniudi gas field of Ordos basin is the Upper Carboniferous Taiyuan,Lower Permian Shanxim and Xiashihezi Formations.Stratigraphic division and correlation are difficult because of rapid change of fluvial facies,sparse well pattern,and large project area in the field.Single stratigraphic division and correlation method failed to work effectively.At the very beginning of the study,there were several schemes as for how to solve the problems.As a result,a composite method of stratigraphic classification and correlation suitable for complicated sedimentary environment are developed by integrating the marker bed method(introducing coal seams as markers and supplementary horizon markers),the isopach method(the same layer having similar thickness) in adjacent wells,the sequence stratigraphy method,and the dense well pattern analysis method(i.e.,applying knowledge obtained from analysis of dense well pattern to sparse well pattern).By doing that,this paper presents a new scheme of stratigraphic division and correlation,which have been used successfully in real practice and achieved a unified understanding of the formations in the study area.
The main gas-bearing horizons in Daniudi gas field of Ordos basin is the Upper Carboniferous Taiyuan,Lower Permian Shanxim and Xiashihezi Formations.Stratigraphic division and correlation are difficult because of rapid change of fluvial facies,sparse well pattern,and large project area in the field.Single stratigraphic division and correlation method failed to work effectively.At the very beginning of the study,there were several schemes as for how to solve the problems.As a result,a composite method of stratigraphic classification and correlation suitable for complicated sedimentary environment are developed by integrating the marker bed method(introducing coal seams as markers and supplementary horizon markers),the isopach method(the same layer having similar thickness) in adjacent wells,the sequence stratigraphy method,and the dense well pattern analysis method(i.e.,applying knowledge obtained from analysis of dense well pattern to sparse well pattern).By doing that,this paper presents a new scheme of stratigraphic division and correlation,which have been used successfully in real practice and achieved a unified understanding of the formations in the study area.
引文
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9高志勇,韩国猛,张丽华,等.河流相沉积中的准层序——以四川中部须家河组为例[J].石油与天然气地质,2007,28(1):59~68
10彭立才,杨慧珠.柴达木盆地大煤沟侏罗系剖面高分辨率含煤层序分析[J].西安石油学院学报(自然科学版),2002,17(1):6~10
11罗群,郑德山.地质-地震综合地层划分对比法及其应用[J].江汉石油学院学报,2001,23(1):26~30
2陈春光.浅析乔家湾矿区山西和太原组煤层聚煤规律及其沉积环境的变化[J].科技情报开发与经济,2005,15(9):184~186
3赵翰卿.高分辨率层序地层对比与我国的小层对比[J].大庆石油地质与开发,2005,24(1):5~9,12
4李宏伟,袁士义,朱怡翔,等.河流相地层相分异与沉积物体积分配规律[J].石油与天然气地质,2005,26(3):356~360
5朱筱敏,康安.鄂尔多斯盆地西南部上古生界层序地层和沉积体系特征[J].石油实验地质,2002,24(4):327~333
6杨明慧,刘池洋.鄂尔多斯中生代陆相盆地层序地层格架及多种能源矿产聚集[J].石油与天然气地质,2006,27(4):563~569
7顾家裕,郭彬程,张兴阳.中国陆相盆地层序地层格架及模式[J].石油勘探与开发,2005,32(5):11~15
8唐海发,赵彦超.高分辨率层序地层学在大牛地气田山一段地层对比中的应用[J].天然气地球科学,2003,14(1):69~73
9高志勇,韩国猛,张丽华,等.河流相沉积中的准层序——以四川中部须家河组为例[J].石油与天然气地质,2007,28(1):59~68
10彭立才,杨慧珠.柴达木盆地大煤沟侏罗系剖面高分辨率含煤层序分析[J].西安石油学院学报(自然科学版),2002,17(1):6~10
11罗群,郑德山.地质-地震综合地层划分对比法及其应用[J].江汉石油学院学报,2001,23(1):26~30
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