Thermal evolution history reconstruction of Carboniferous source rocks in Junggar Basin using TSM basin simulation technology

Jan. 5,2022
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The Wulungu Depression in the Junggar Basin has an area of 1.6×104 km2. Since the beginning of oil and gas exploration in the 1950s, 11 wells have been drilled in different structural positions. However, except for the discovery of oil and gas on the periphery of the depression, no major breakthrough has been made for a long time. Previous studies have shown that the Carboniferous sources rocks is the “key” for the “unlocking” of oil and gas discoveries in the Wulungu Depression. For many years, there is a lack of systematic research on the dynamic hydrocarbon generation process of Carboniferous source rocks in the depression and its periphery. The differential thermal evolution and controlling factors of source rocks in different sags are not clear, which restricts the understanding and exploration of the overall hydrocarbon accumulation laws on the northeastern region of the Junggar Basin. Therefore, restoring the thermal evolution history of Carboniferous source rocks plays an important role in deepening the understanding of the hydrocarbon accumulation process in this area.

Based on the study of basin prototype evolution and source rock development characteristics, the Wuxi Research Institute of Petroleum Geology (PEPRIS, SINOPEC), together with the SINOPEC Shengli Oilfield, established one-dimensional and three-dimensional basin simulation models of the Wulungu Depression so as to reconstruct the burial, thermal, and hydrocarbon generation histories of different structural units by the means of TSM Basin Simulation and Resource Evaluation System. The simulation results showed obvious differences in the hydrocarbon generation and evolution process of Carboniferous source rocks in the sags on the northeastern margin of the Junggar Basin. The Carboniferous source rocks in the Wulungu Depression are featured by two stages of hydrocarbon generation. They entered the low-maturity evolution stage at the end of the Carboniferous, stagnated due to uplifts in the Permian, reached the threshold of secondary hydrocarbon generation at the end of Triassic when burial resumed, and are now in the over-mature stage, mainly generating dry gas (Ro>2.0%). The cumulative gas generation at the end of Cretaceous is 18.4×109 t, which is the main gas generation period.

This is the first time that the TSM basin simulation software has been used to simulate and restore the thermal evolution history of Carboniferous source rocks in the environment of volcanic rock development. It reconstructed the evolution process of source rocks, and provided a scientific basis for oil and gas exploration in the Wulungu Depression for hydrocarbon supply from Carboniferous sources. The related research was completed by ZHOU Yushuang, et al. and published in “Petroleum Geology & Experiment”, Volume 43, Issue 2, 2021 (doi: 10.11781/sysydz202102297) with the title of “Thermal evolution history reconstruction of Carboniferous source rocks on the northeastern margin of Junggar Basin using TSM basin simulation technology”. The bilingual version is also available in http://jtp.cnki.net/bilingual/detail/html/SYSD202102013.

Corresponding Author: ZHOU Yushuang
Email: zhouys.syky@ sinopec.com
CNKI Press Officer: LI Jingjing YANG Na
Email: ljj6806@cnki.net yn6791@cnki.net

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