摘要
对库车坳陷主要探井和１３个露头剖面近１６０个中生界源岩样品镜质体反射率进行了实测分析，并利用地震测线人工井模拟计算镜质体反射率，初步明确了库车坳陷三叠—侏罗系源岩有机质成熟度的分布规律。依南２井三叠系—侏罗系源岩实测镜质体反射率为１０３％～１４３％，阳１井中、下侏罗统实测镜质体反射率为０９５％～１１０％各个露头剖面镜质体反射率存在很大差异，露头剖面成熟度区域上总体呈现西部高（Ｒｏ高达１８１％～１８３％）东部低（Ｒｏ在０５６％～０７９％），中部介于东西部之间，北部低（Ｒｏ在０５７％～０６８％）南部高的特点。在逆冲带，由于近晚期逆冲断层将深部烃源层推到浅部或地表，即使埋深很浅。
Vitrinite reflectance
values of 160 Mesozoic samples collected from the main exploratory wells and 13 outcrop
sections in Kuqa depression have been analyzed, and meanwhile thermal maturity modeling
for artificial wells from seismic profiles were performed, to delineate organic maturity
distribution of Jurassic-Triassic source rocks in Kuqa depression. Vitrinite reflectance values of
Jurassic-Triassic source rocks in Well YN2 range from 1.03% to 1.43%, the values of
Middle-Lower Jurassic values of Jurassic -Triassic source rocks are obviously different in
different outcrop sections, the west ourcrop sections show higher vitrinite reflectance value
(1.81%1.83%), but the eastern outcrop sections show lower vitrinite reflectance value
(0.57%0.68%), while vitrinite reflectance value of middle outcrop sections transit between the
east and the west. The deeper source beds were thrust to the shallower depth or surface of
earth by overthrust fault in overthrust belt, where the higher vitrinite reflectance values still
occur, in despite of that source rock in this belt buried at very shallow depth now.
出处
《新疆石油地质》
CAS
CSCD
1999年第3期221-224,共4页
Xinjiang Petroleum Geology
关键词
塔里木盆地
库车坳陷
油层
有机质成熟度
烃源岩
Jurassic Triassic Source bed Organic maturity Vitrinite reflectance Kuqa depression
Tarim basin
