EUR分布类比法在川中地区侏罗系致密油资源评价中的应用  

EUR Distribution Analogous Method:Application to Tight Oil Assessment in Jurassic,Sichuan Basin

作　　者：汪少勇[1] 李建忠[1] 李登华[1] 陈晓明[1] 宋涛[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083

出　　处：《天然气地球科学》2014年第11期1757-1766,共10页Natural Gas Geoscience

基　　金：中国石油天然气集团公司重大专项"四川盆地侏罗系石油勘探开发关键技术研究"(编号:2012E-2601);中国石油天然气集团公司重大专项"油气资源评价-中国石油第四次油气资源评价"(编号:2013E-0502);国家科技重大专项(编号:2011ZX05028-002)联合资助

摘　　要：四川盆地侏罗系具致密油资源形成的条件,前人资源评价结果差别较大,需采用非常规的资源评价方法进一步认识其资源潜力。川中地区侏罗系致密储层石油生产井数据多,能使用EUR（Estimated Ultimate Recovery）分布类比法计算资源量。将EUR分布类比法分为6个基本步骤,在油气生产井多,生产时间长的地区能快速估算研究区的可采资源量。应用EUR分布类比法计算川中侏罗系致密储层石油的EUR分布,建立了EUR的地质评价标准,并估算了公山庙、桂花2个油区的可采资源量。结果表明：川中地区侏罗系3套主力产层中,50%概率下沙一段Ⅰ类区单井EUR值可达3×10^4t,凉上段Ⅰ类区的单井EUR值可达2.8×10^4t,大安寨段Ⅰ类区的单井EUR值为2.5×10^4t,有效烃源岩的厚度、裂缝发育程度、有效烃源岩厚度与储层厚度的比值对EUR值的影响最大;川中地区侏罗系致密油Ⅰ类区50%概率的生产井井控面积约为1.4km^2,Ⅱ类区的井控面积主体在0.75-1km^2之间,Ⅲ类区井控面积约为0.35-0.45km^2;使用EUR分布类比法估算公山庙、桂花2个油区近2 000km^2范围内3套主力产层的可采资源量分别为1 679.82×10^4t和781.53×10^4t,表明四川盆地侏罗系致密储层石油具有较大的勘探潜力。EUR distribution analogous method is applicable to unconventional resource assessment.Geological settings for tight oil resource exist in Jurassic,central Sichuan Basin.The large number of long-run production wells in this area creates condition for the use of EUR distribution analogous method.This paper divides EUR distribution analogous method into six steps.We calculated the distribution of EUR in three main production layers（J2s1,J1 l and J1dn）and established a geological evaluation standard for EUR in Jurassic reservoir.The results show that in the best pay zone（Ⅰarea）,J2s1 has the highest EUR with a value of 3×10^4t（50%）,while the EUR in J1 l and J1 dn with the same probability is 2.8×10^4t and 2.5×10^4t,respectively.The research also reveals that the well space in theⅠ area is about 1.4km^2（50%）,in theⅡ area and theⅢ area is 0.75-1km^2 and 0.35-0.45km^2,respectively.EUR distribution analogous method was used to calculate the recoverable resource in Gongshanmian and Guihua Oilfields,and the two oil fields have recoverable resource of 1679.82×10^4t and 781.53×10^4t,respectively with an area of 2000km^2 in total.It indicates that the resource potential of tight oil can be great in Jurassic,Sichuan Basin.

关 键 词：EUR分布类比法 致密油 川中侏罗系 资源评价 

分 类 号：TE132.14[石油与天然气工程—油气勘探]