沉积环境复杂地区地层划分对比方法_

　第29卷　第1期

O I L &G AS GE OLOGY 2008年2月　

收稿日期:2007-06-19。 第一作者简介:罗东明(1964—),男,高级工程师,石油地质。 基金项目:中国石油化工股份有限公司科技部攻关项目(P04087)。

文章编号:0253-9985(2008)01-0038-07

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

罗东明1

,谭学群2

,游瑜春2

,刘建党2

,冯　琼2

,刘忠群

3

(1.中国石油化工股份有限公司油田事业部,北京100029;2.中国石油化工股份有限公司石油勘探开发研究院,北京100083;3.中国石油化工股份有限公司华北分公司,河南郑州450006)

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。

关键词:标志层;等厚法;层序;地层划分对比;煤层;大牛地气田;鄂尔多斯盆地中图分类号:TE12113 文献标识码:A

Stra ti graph i c d i v isi on and correl a ti on i n area s w ith com pli ca ted

sed im en t ary env i ronm en t

—a case study of Daniudi gas field in the O rdos Basin

Luo Dongm ing 1

,Tan Xuequn 2

,You Yuchun 2

,L iu J iandang 2

,Feng Q i ong 2

,L iu Zhongqun

3

(11O ilfield D epart m ent,S I NO PEC,B eijing 100029,China;

21Research Institute of Petroleum Exploration &Production,S I NO PEC,B eijing 100083,China;

31N orth China Co m pany,S I NO PEC,Zhengzhou,Henan 450006,China )

Abstract:The main gas 2bearing horiz ons in Daniudi gas field of O rdos basin is the Upper Carbonifer ous Taiyuan,Lower Per m ian Shanxi m and Xiashihezi For mati ons .Stratigraphic divisi on and correlati on are difficult because of rap id change of fluvial facies,s parse well pattern,and large p r oject area in the field .Single stratigraphic divisi on and correlati on method failed t o work effectively .A t the very beginning of the study,there were several sche mes as for ho w t o s olve the p r oble m s .A s a result,a co mposite method of stratigraphic classificati on and correlati on suitable for co mp licated sedi m entary envir on ment are devel oped by integrating the marker bed method (intr oducing coal sea m s as markers and supp le mentary horiz on markers ),the is opach method (the sa me layer having si m ilar thick 2ness )in adjacent wells,the sequence stratigraphy method,and the dense well pattern analysis method (i .e .,ap 2p lying kno wledge obtained fr om analysis of dense well pattern t o s parse well pattern ).By doing that,this paper p resents a ne w sche me of stratigraphic divisi on and correlati on,which have been used successfully in real p ractice and achieved a unified understanding of the f or mati ons in the study area .

Key words:marker bed;is opach method;sequence;stratigraphic divisi on and correlati on;coal sea m;Daniudi gas field;O rdos Basin