Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5161485 | Organic Geochemistry | 2016 | 16 Pages |
Abstract
Two episodes of oil and one episode of gas charge were delineated in the Dabei gas field. The second episode of oil charge occurred around 5-4Â Ma, while gas charge occurred around 3-2Â Ma. Three episodes of oil and one episode of gas charge were identified in the Kela-2 gas field. The latter two episodes of oil charge occurred around 5.5-4.5Â Ma and the gas charge occurred around 3-2Â Ma. The timing of the petroleum charge was also confirmed by the correlation between the maturity of the source rocks during the times of charge and the maturity levels of the light oil and gas in the reservoirs. The later oil and gas charge occurred at the same period in both the Dabei and Kela-2 gas fields, possibly relating to structural reactivation caused by regional tectonic compression, because intense tectonic compression and rapid uplift of the Tianshan Mountains occurred during the same period, which may have caused thrust fault activation and opening. Hydrocarbon expulsion from the source rocks during the period was possibly also related to the regional tectonic movement, providing hydrocarbon sources for the reservoirs.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Xiaowen Guo, Keyu Liu, Chengzao Jia, Yan Song, Mengjun Zhao, Qingong Zhuo, Xuesong Lu,