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- Title
Thermal evolution of Jurassic source rocks and their impact on hydrocarbon accumulation in the northern margin of Qaidam Basin, NW China.
- Authors
HAN Yang; GAO Xian-zhi; ZHOU Fei; WANG Bo; ZHU Jun; DUAN Li-feng
- Abstract
Jurassic strata is the most important source rock in the center of north margin of Qaidam Basin, which was still lack of systematic research in their complex hydrocarbon evolution process. On the basis of drilling data, seismic data and testing data, the model of EASY% RO was used to recover the thermal evolution history of Jurassic source rocks in different structural units of the study area and analyze the thermal evolution difference of source rock in different hydrocarbon sag, in order to provide important evidences for the next hydrocarbon exploration in the center of northern margin of Qaidam Basin. Research shows that the thermal evolution degree of Jurassic source rock decreased gradually from west to east. The Lower Jurassic source rock of Kunteyi and Yibei sags in the southwest entered the hydrocarbon generation threshold in the Early Paleogene and reached the peak in the Late Paleogene. The Middle Jurassic source rock of Saishiteng in northeast entered the hydrocarbon generation threshold in the Late Pliocene and is still at the peak now. The center of north margin of Qaidam Basin underwent the two key accumulation periods including Late Yanshanian and Late Himalayan. According to the matching relationship between the historical hydrocarbon generation time and tectonic style, it is clear that the Lenghu No.7 area is the next favorable exploration area.
- Subjects
CHINA; SEISMIC testing; ROCKS; SEISMIC prospecting; HYDROCARBONS; BIOLOGICAL evolution; HISTORICAL source material; JURASSIC Period
- Publication
Natural Gas Geoscience, 2020, Vol 31, Issue 3, p6
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2019.12.013