四川盆地中北部侏罗系大面积非常规石油勘探潜力的再认识  

A re-recognition of the prospecting potential of Jurassic large-area and non-conventional oils in the central-northern Sichuan Basin

作　　者：梁狄刚[1] 冉隆辉[1] 戴弹申[1] 何自新[1] 欧阳健[1] 廖群山[1] 何文渊[1] 

机构地区：[1]中国石油天然气集团公司咨询中心,北京100724

出　　处：《石油学报》2011年第1期8-17,共10页Acta Petrolei Sinica

摘　　要：通过对四川盆地侏罗系石油的资源潜力、油藏类型、裂缝型储层及勘探开发技术适应性等4个方面进行的再认识,作者认为:①四川盆地侏罗系的石油资源量可能比目前的(10～11)×108t要大得多。②它是一种特殊类型的大面积非常规致密油聚集,没有明显圈闭界限;没有明显边、底水及油水界面,属"无水油藏";浮力与重力分异不明显,缺少大规模二次运移,源内或近源聚集;储层具有特低孔渗、双重介质特征;大面积整体含油,多层系叠合连片,"连续"分布在斜坡及凹陷区,不受局部构造控制而受岩性控制,含油范围以油井分布范围划定,往往是先有产量后有储量。③不能把侏罗系油层简单定性为"裂缝型",裂缝是测试及生产初期获得高产的必要条件,但各类孔隙对储量和长期低产稳产有重要贡献。④这类非常规致密油的储量规模很大,但是要采用以压裂为主的非常规技术进行开采。建议以龙岗地区沙溪庙组为突破口,推动四川盆地石油勘探开发打开一个新局面。The present paper made a re-recognition of Jurassic oils in Sichuan in terms of the four aspects,such as resource potential,reservoir types,fractured reservoirs and techniques of exploration and development.The paper has drawn the following conclusions.①The Jurassic oil resource in Sichuan may be much more than the presently discovered amount of 1.0～ 1.1 billion tons.②The Jurassic oil resource is a special large-area and non-conventional compact oil accumulation that has no clear trap boundaries,no clear edge-water,bottom-water and oil-water boundaries like a ＂water-free reservoir＂,and no clear differentiation between buoyancy and gravity.Their reservoirs are characterized by inner-source or near-source accumulation rather than large-scale secondary migration,ultra-low permeability,dual media,large-area entire oiliness,superimposed and linked multi-measures,＂continuous＂ occurrence on slopes or in depressed areas,being restricted by lithology rather than local structures,and delimitating oil-bearing and well distribution areas frequently by output instead of reserve.③Jurassic reservoirs can not be simply defined as ＂fractured type＂ because various pores contribute significantly to both the reserves and long-term low but stable production though fractures are the prerequisite for a high output at the testing or production beginning.④These exists a great reserve for this kind of non-conventional compact oils in the central-northern Sichuan,however,a non-conventional technique consisting mainly of hydraulic fracturing should be adopted in development.It was proposed that Shaximiao Formation in the Longgang area should be a prospecting target,which will be a breakthrough to open a new era for petroleum exploration in Sichuan Basin.

关 键 词：四川盆地 资源量 非常规石油聚集 致密油层 裂缝型油层 勘探潜力 压裂改造 

分 类 号：TE122.1[石油与天然气工程—油气勘探]