四川盆地下志留统龙马溪组页岩小层划分与储层精细对比  

Micro-layers division and fine reservoirs contrast of Lower Silurian Longmaxi Formation shale,Sichuan Basin,SW China

作　　者：赵圣贤[1,2] 杨跃明[1,2] 张鉴[1,2] 王兰生[3] 王兴志[4] 罗超[1,2] 田冲[1,2] 

机构地区：[1]中国石油西南油气田公司勘探开发研究院,四川成都610051 [2]页岩气评价与开采四川省重点实验室,四川成都610051 [3]中国石油西南油气田公司,四川成都610051 [4]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500

出　　处：《天然气地球科学》2016年第3期470-487,共18页Natural Gas Geoscience

基　　金：国家科技重大专项"页岩气勘探开发关键技术--南方海相页岩气开采试验"(编号:2012ZX05018-006);973计划项目"中国南方海相页岩气高效开发的基础研究-南方海相典型区块页岩气开发理论与技术适应性研究"(编号:2013CB228006);973计划项目"中国南方古生界页岩气赋存富集机理和资源潜力评价-南方古生界典型区块页岩气勘探潜力评价-长宁典型区块古生界页岩气勘探潜力评价"(编号:2012CB214706-03)联合资助

摘　　要：四川盆地下志留统龙马溪组海相页岩气工作已经从初期的资源调查、评层选区阶段进入大规模效益开发阶段,开展页岩地层小层划分及页岩储层精细对比,是页岩气勘探—开发一体化的迫切需要、是实施地质—工程一体化的重要指导。通过岩心描述、薄片鉴定、测井及实验分析资料对典型井的岩性、地层层序、沉积旋回、古生物等研究,进行区域小层划分;开展小层沉积微相对比及页岩储层精细对比,探讨各小层储层与产量影响关系。四川盆地龙马溪组底部龙一1亚段由下至上进行＂四分＂小层：龙一1^a、龙一1^b、龙一1^c和龙一1^d,龙一1^b小层为全盆地标志层,对比性高龙一1^a、龙一1^b小层沉积微相以炭质泥棚级、硅质泥棚级为主,区域延续性好,为优势相带;龙一1^a、龙一1^b小层页岩储层以Ⅰ类为主,纵横向连续性好,龙一1^c、龙一1^d小层页岩储层以Ⅲ类和Ⅱ类为主,储层连续性差。通过生产井压裂效果分析表明,靠近龙马溪组底部的龙一1^a小层和龙一1^b小层优势微相发育,且Ⅰ类储层连续性好,其压裂效果好于顶部龙一1^c、龙一1^d小层。It is totally known that the work of Lower Silurian Longmaxi Formation shale in Sichuan Basin has entered large scale benefit development rather than resources survey,layers assessment or area choices as it was in the beginning.It urgently needs a significant direction for the integration of E D,G R to carry out micro-layers division and fine reservoirs.The micro-layers division begins with the study on lithology,sequence,facies,palaeontology of typical wells through core description,micro-flakes identification,logs and lab analysis.Probe effect relationship between reservoirs and output is examined by carrying out contrasts about microfacies fine reservoirs of each micro-layer.It has been divided into four microlayers of Lower Long 1sub section,which are marked as＂a＂,＂b＂,＂c＂and＂d＂.Among them the micro-layer-b is the mark among areas,which has the highest tracking.The microfacies of a b are mainly carbonmuddy shelf and silicon-muddy shelf,which has fine area spread.The reservoirs of a b are both typeⅠ,which also has fine spread,though the reservoirs of c d are mainly type Ⅲ Ⅱ,which has the worse spread.Through the analysis of fracture effects on output-wells,it indicates that the fracture effects of a b,which both have the advantage of microfacies,fine area spread of reservoir type I and at the bottom of Longmaxi Formation,will be better than c d.

关 键 词：四川盆地 下志留统龙马溪组 小层划分 沉积微相 储层精细对比 压裂效果应用 

分 类 号：TE121.34[石油与天然气工程—油气勘探]