Controls of Tectonic Activity on Alluvial Fan Deposits and Hydrocarbon Accumulation: A Case Study of Permian and Triassic Alluvial Fans in Northwestern Margin of Junggar Basin

摘要/Abstract

摘要： The coupling relationship between tectonic activity and alluvial fan deposits is one of the hot spots and difficulties in tectono-sedimentology research. Uncommon and widespread glutenite bodies are developed along the fault zone in the northwestern margin of Junggar basin. Therefore, studies on the controls of tectonic activity on alluvial fans and hydrocarbon accumulation are of great theoretical and practical significance. Using the data of cores, logging and seismic profiles, this paper studies the distribution of structure-controlled alluvial-fan glutenite bodies, and the hydrocarbon accumulation patterns combined with related oil and gas accumulation data. It is shown that the superimposition pattern of alluvial fans is closely related to the activity of contemporaneous faults, and there are 3 typical distribution patterns of the fans under the control of contemporaneous faults, which include the retrograded alluvial fans against the source direction and controlled by normal comb-like fault combination, the laterally superimposed alluvial fans and vertically stacking alluvial fans controlled by reverse comb-like faults and crossing faults, and the progradational alluvial fans controlled by preceding faults. Tectonic activity has significant impact on provenance, landform and local climate during the formation of these alluvial fans. These factors jointly control the development and sedimentary sequence differences of alluvial-fan glutenite bodies at different positions of the structures. It is concluded that alluvial-fan glutenite reservoir forms under the effects of both structure and lithology, which is characterized by one reservoir in one fan, several reservoirs in one fan, and one reservoir in several fans.

关键词: Junggar basin, northwestern margin, tectonic activity, alluvial fan, glutenite, contemporaneous fault, petroleum reservoir

Abstract: The coupling relationship between tectonic activity and alluvial fan deposits is one of the hot spots and difficulties in tectono-sedimentology research. Uncommon and widespread glutenite bodies are developed along the fault zone in the northwestern margin of Junggar basin. Therefore, studies on the controls of tectonic activity on alluvial fans and hydrocarbon accumulation are of great theoretical and practical significance. Using the data of cores, logging and seismic profiles, this paper studies the distribution of structure-controlled alluvial-fan glutenite bodies, and the hydrocarbon accumulation patterns combined with related oil and gas accumulation data. It is shown that the superimposition pattern of alluvial fans is closely related to the activity of contemporaneous faults, and there are 3 typical distribution patterns of the fans under the control of contemporaneous faults, which include the retrograded alluvial fans against the source direction and controlled by normal comb-like fault combination, the laterally superimposed alluvial fans and vertically stacking alluvial fans controlled by reverse comb-like faults and crossing faults, and the progradational alluvial fans controlled by preceding faults. Tectonic activity has significant impact on provenance, landform and local climate during the formation of these alluvial fans. These factors jointly control the development and sedimentary sequence differences of alluvial-fan glutenite bodies at different positions of the structures. It is concluded that alluvial-fan glutenite reservoir forms under the effects of both structure and lithology, which is characterized by one reservoir in one fan, several reservoirs in one fan, and one reservoir in several fans.

Key words: Junggar basin, northwestern margin, tectonic activity, alluvial fan, glutenite, contemporaneous fault, petroleum reservoir

YIN Senlin, TANG Yong, HU Zhangming, WU Tao, ZHANG Lei, ZHANG Jiyi. Controls of Tectonic Activity on Alluvial Fan Deposits and Hydrocarbon Accumulation: A Case Study of Permian and Triassic Alluvial Fans in Northwestern Margin of Junggar Basin[J]. 新疆石油地质, 2016, 37(zk(English) ): 49-59.

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