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Controls of Faulted Salient on the Volcanic Reservoir in Jinlong Oilfield, Junggar Basin
ZHAO Fei1, LI Jingjing2, HAN Bao2, LI Wei2, ZHANG Qin3
2017, 38 (6):
1-1.
doi: 10.7657/XJPG20170606
The ancient landform of “faulted salient” in Jiamuhe formation of eastern slope of Zhongguai swell in the northwestern margin of Junggar basin has several controlling effects on the development characteristics of the volcanic reservoir in Jiamuhe formation of Jinlong oilfield. Using the data of core, drilling, logging, seismic, thin section and physical properties, the paper comprehensively analyzes the controls of the faulted salient on lithology, lithofacies, favorable reservoir, trap and reservoir distribution of the volcanic rocks in Jiamuhe formation, providing scientific basis for volcanic reservoir prediction and exploration. The lithology of the volcanic reservoir in the study area can be divided into 4 categories such as volcanic lava, pyroclastic lava, pyroclastic rock and sedimentary pyroclastic rock. Controlled by the faulted salient, volcanism weakens but sedimentation enhances from west to east, resulting in the sedimentary facies transition from crater facies, explosive facies and effusive facies to volcanic sedimentary facies. Lithology, lithofacies, structural fracture and weathering and leaching constrained by the faulted salient are the main controlling factors. The best-quality reservoir in the study area is distributed on the high position of the faulted salient. The forming of the faulted salient can directly control trap patterns such as faulted-block trap, faulted-nose trap and lithological pinchout trap in the eastern part of the faulted salient, and reservoir distributions.
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