摘要
利用沥青质拉曼D峰相对强度、G峰相对强度、两峰间距宽窄与沥青演化成熟度关系,推出Dh/Gh和G-D与沥青成熟度成正比关系图。塔北奥陶系储层中发育3期储层沥青,通过3期储层沥青拉曼Dh/Gh和G-D认为:第Ⅰ期为高热成熟炭质储层沥青,第Ⅱ期为成熟沥青质储层沥青,第Ⅲ期为过成熟油质储层沥青和沥青质储层沥青共存。前两期储层沥青是由于热变质而成,第Ⅲ期两种储层沥青共存主要是岩石选择性吸附导致。3期储层沥青的分布及性质决定塔北奥陶系成藏北部老、南部新,北部重质油、南部凝析油的特点。在哈拉哈塘—英买力地区南边发现油质储层沥青为在这一区域找喜马拉雅期凝析油藏提供了证据。
According to the relationship between the relative intensity of D-peak,G-peak and G-D peak spacing of bitumens and the maturity of bitumen evolution,we deduced that the Dh/Gh ratio and G-D peak spacing are positively proportional to bitumen maturity.Bitumens in Ordovician reservoir in the northern Tarim Basin are thought to have evolved in three stages and the Dh/Gh ratio and G-D peak spacing of Raman measurements on these bitumens indicated that the first-stage bitumen is highly-mature carbonaceous reservoir bitumen,the second-stage one is mature asphaltene reservoir bitumen,and the third-stage one is a combination of overmature oily reservoir bitumen and asphaltene reservoir bitumen.The formation of the first-and second-stage bitumens is attributed to thermal metamorphism,while the co-existence of two different bitumens for the third-stage bitumen is mainly due to selective adsorption of rocks.The distribution and property of these three-stages bitumens in Ordovician reservoirs of the northern Tarim Basin may determine the nature of Ordovician reservoirs,which is characterized by the southern condensate oil later than the northern heavy oil.The observation of oily reservoir bitumen in the northern Halahatang-Yingmaili region can provide evidence and targets for exploring Himalayan condensate oil reservoirs in this area.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2013年第2期225-231,共7页
Acta Petrolei Sinica
基金
中国石油天然气股份有限公司塔里木油田分公司科研项目(041010120148)资助
关键词
储层沥青
荧光
拉曼
奥陶系
塔北地区
reservoir bitumen
fluorescence
Raman
Ordovician
northern Tarim Basin
