Petroleum charge history of the slope area of Katake Uplift in Tarim Basin

Abstract

Based on the oil and gas observation and diagenetic sequence identification of multiple sets of strata by using drilling data from well Zhong 1 on the northwestern slope of Katake Uplift and well Shun 1 in the Shuntuoguole Low Uplift of Tarim Basin, fluid inclusion types, abundance, composition and occurrence state of diagenetic minerals were studied in this paper. The comprehensive use of technical methods and data including homogenization temperature and freezing point determination of fluid inclusions, K-Ar isotope dating of authigenic illites in sandstone reservoirs, paleo-geothermometry, burial and tectonic evolution histories revealed the accumulation, adjustment or deformation of multi-facies of hydrocarbons in various formations on the slope of Katake Uplift. Results indicated three stages of hydrocarbon accumulation in the study area. The first stage was 410-370 Ma (the late Caledonian), the second stage was 280-175 Ma (the late Hercynian to Indosinian), and the third stage was 80-23 Ma (the late Yanshanian to middle and late Himalayan). There were three stages of accumulation in the Lower Paleozoic and two stages in the Upper Paleozoic. The charging and accumulation of oil and gas in clastic rocks concentrated in the late Hercynian.

Keywords

• k-ar dating of authigenic illite
• hydrocarbon accumulation stage
• hydrocarbon fluid inclusion
• katake uplift
• tarim basin