Oil and gas resource assessment of basins with low levels of exploration on the periphery of the Junggar Basin and identification of exploration targets

doi:10.3969/j.issn.1672-7703.2020.06.003

Abstract

Abstract: There are many relatively unexplored small-medium basins on the periphery of the Junggar Basin. Geological understanding of these basins is low, and geological data are sparse. Future risk exploration would benefit enormously from accurate analysis of the hydrocarbon source conditions in these basins and their oil and gas resource potential. This study describes the formations of main source rocks in the peripheral basins of the Junggar Basin and estimates the oil and gas resource potential of each basin. The study is based on seismic data, well logging, laboratory testing, and previous literatures. The method for basins with low levels of exploration is used for oil and gas resource assessment. The results show that Jurassic and Permian source rocks are the main oil source rocks in these basins. The organic matter abundance of the Jurassic coal-measure source rocks is high, with the rocks having reached the mature stage and having strong hydrocarbon generation capacity. The Permian source rocks are medium to good, the organic matter type is Ⅱ2-Ⅲ, and the source rocks are in the mature to high-mature stage. The Carboniferous and Devonian source rocks are the main gas source rocks. They are in the high- to over-mature stage and are gas-prone. Using the genetic method, the calculated total oil and gas resources of seven low-exploration basins on the periphery of the Junggar Basin are 15009.75×104 t and 339.27×108 m3, respectively, characterized as “more oil and less gas”. Based on this assessment, three favorable hydrocarbon accumulation models—for the Jurassic, the Carboniferous-Permian, and the Devonian—are established. The Heshituoluogai and Buerjin basins are identified as Type A basins with great oil and gas resource potential and considered to be the most promising areas for risk exploration.

CLC Number:

Feng Dehao, Liu Chenglin, Jiang Wenli, Gao Xuan, Li Pei, Li Bin, Liu Yongjun, Zhang Wei. Oil and gas resource assessment of basins with low levels of exploration on the periphery of the Junggar Basin and identification of exploration targets[J]. China Petroleum Exploration, 2020, 25(6): 26-38.

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