摘要
通过大量岩心、岩屑和原油样品测试分析,结合456口井的生产动态数据,明确了四川盆地侏罗系4套主要烃源岩的生烃潜力和3套主力产层的成藏特征,指出凉高山组、大安寨段和东岳庙段烃源岩以生油为主,珍珠冲段烃源岩以生气为主,富有机质烃源岩控制致密油甜点分布,工业油井绝大多数位于TOC>1.2%的优质烃源岩区,微米级孔喉是致密油有效储集空间,裂缝是开采初期高产的关键。四川盆地侏罗系致密油整体呈现油质轻、气油比高、异常高压的特点,有利于致密油流动和产出。采用小面元法、资源丰度类比法、EUR类比法和有机碳法4种方法,评价四川盆地侏罗系致密油地质资源量在(20~30)×10~8t。通过资源富集主控因素分析,建立了四川盆地致密油地质资源评价分级标准,运用小面元法计算Ⅰ类地质资源量为16.11×10~8t,Ⅱ类地质资源量为4.77×10~8t,Ⅲ类地质资源量为2.89×10~8t。预测大安寨段在南充—遂宁一带及梁平以东勘探潜力最大,凉高山组在广安—南充—遂宁—仪陇一带最为有利,东岳庙段在广安—遂宁一线以南具有较好的勘探前景。
Through the test analysis of massive core,rock debris and crude oil samples in combination with the production performance data of 456 wells,the hydrocarbon generation potentials of four sets of chief source rocks are identified as well as the accumulation characteristics of three sets of major oil-producing layers.It is pointed out that the source rocks of Lianggaoshan Group,Da'anzhai Member and Dongyuemiao Member are dominant in oil generation,while those of Zhengzhuchong Member are dominant in gas generation.The organic-rich source rocks control the distribution of tight-oil sweet spots,and most of industrial oil wells are located in the high-quality source rock area with TOC value more than 1.2%.Micron-sized pore throats are the effective reserving space of tight oil,and the fractures play a key role in the initial high yield.Meanwhile,Jurassic tight oil in Sichuan Basin is wholly characterized by light oil,high gas-oil ratio and abnormal high-pressure,conductive to tight oil flow and output.Using four methods,including,small bin method,resource abundant analogy method,EUR analogy method and total organic carbon method,the geological resources of Jurassic tight oil in Sichuan Basin are evaluated to be(20-30)×10~8 t.Through analyzing the main control factors of resource enrichment,the geological resources evaluation rating criteria of tight oil in Sichuan Basin are established,and the small bin method is used to obtain the Class Ⅰ geological resources of 16.11×10~8 t,the Class Ⅱ geological resources of 4.77×10~8 t and the Class Ⅲ geological resources of 2.89×10~8 t.It is predicted that Nanchong-Suining area and the east of Liangping are favorable exploration regions of Da'anzhai Member,Guang'an-Nanchong-Suining-Yilong area is the most favorable exploration zone of Lianggaoshan Group,and Dongyuemiao Member has a good exploration prospect in the south of Guang'an-Suining area.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2017年第7期740-752,共13页
Acta Petrolei Sinica
基金
国土资源部重大科技专项"全国油气资源动态评价"(2015YQKYQ01)
中国石油天然气股份有限公司重大科技专项"四川盆地侏罗系石油勘探开发关键技术研究"(2012E-2601)
"中国石油第四次油气资源评价"(2013E-0502)资助
关键词
致密油
形成条件
地质特征
甜点
资源评价
优质烃源岩
tight oil
formation conditions
geological characteristics
sweet spot
resource assessment
high-quality source rock
