摘要
近期,新疆油田非常规致密油领域获得重大突破,有效推动了我国非常规油气勘探。准噶尔盆地东部吉木萨尔凹陷二叠系芦草沟组致密油储集岩主要由泥质粉(细)砂岩、白云质粉(细)砂岩和砂屑白云岩组成,纵向上集中发育为上、下2段,下段以粉砂岩为主,上段以湖相云质岩为主,具有典型的咸化湖相沉积特征。吉木萨尔凹陷二叠系芦草沟组优质烃源岩发育,致密储层大面积连续分布,且具有纵向上"源储共生"、横向上连续分布的源储组合关系;致密油成藏主要受优质烃源岩分布、致密储层物性、含油饱和度控制,沿致密储层集中段富集。基于上述特征,采用小面元、EUR评价方法计算凹陷上、下2段致密油的地质资源量约为20×108t,技术可采资源量约为1.15×108t;其中较为现实的Ⅰ类资源量约为2.5×108t,技术可采资源量为0.16×108t。吉木萨尔凹陷致密油作为典型咸化湖盆地源内互层致密油类型,开展芦草沟组致密油刻度区解剖,获取地质评价与资源评价关键参数,将为类似非常规致密油区块资源评价提供类比及借鉴依据。
In recent years, significant progress has been made on the exploration of tight oil by the PetroChi- na Xinjiang Oilfield Company,further driving the exploration of unconventional petroleum in China.Reser- voirs of the tight oil from the Middle Permian Lucaogou Formation in Jimusar Sag of the Junggar Basin are composed of muddy siltstone,dolomite siltstone and sandy dolomite.They vertically developed in two sec- tions：the upper section （consisting of siltstone） and the lower section （consisting of lacustrine dolomite rocks） ,showing typical characteristics of saline-lacustrine sediments. High-quality source rocks commonly developed in the Middle Permian Lucaogou Formation and tight reservoirs are distributed in a large area continuously with giant reservoir space,of which have vertically alternating-relationship and laterally con- tinuous distribution.Accumulation of tight oil is mainly controlled by the distribution of source rocks,res- ervoir property and oil saturation, enriching in the tight reservoir section.Based on geological characteristics of tight oil described above,a precise integration method （the small patch method and EUR analogy meth- od） was applied to assess the low and upper tight oil resources with a sum of 2 billion tons in place and 0.115 billion tons of the technically recoverable resources （TRR）.Among them,the type I resource rea- ches up to 0.25 billion tons in place and 0.016 billion tons of TRR as available resources.The tight oil in Ji musar Sag, as typical saline-lacustrine tight oil,was analyzed about the geological and resource assessment parameters, providing a classic example of the integrated resource assessment of unconventional petroleum for others.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2016年第9期1688-1698,共11页
Natural Gas Geoscience
基金
中国石油天然气股份有限公司重大科技专项"油气资源评价-中国石油第四次油气资源评价"(编号:2013E-0502)资助
关键词
致密油
资源评价
评价参数
芦草沟组
吉木萨尔凹陷
Tight oil
Resource assessment
Assessment parameters
Lucaogou Formation
Jimusar Sag
