Abstract
AbstractHailaer basin is an arc-shaped faulted basin formed by continental plate tectonic movement. The Wuerxun and Beier Sag which in the middle of the basin is the main enrichment area of complex fault block oil reservoirs. Deepening the understanding of the development and evolution of sedimentary system in the sag is conducive to tapping the potential of oil reservoirs in the next step. Based on the analysis of the control of tectonic evolution on sedimentation in Wuerxun-Beier Sag, the knowledge base of sedimentary microfacies in the developed area is established. Combined with the prediction of well seismic facies controlled sand body, the multi-stage and multi-source sedimentary system description technology is formed. The study shows that the sedimentary pattern in the sag is controlled by multi-stage episodic tectonic activity, paleotopography and depression controlling faults. There are mainly three filling styles of depositional system: steep slope near source deep-water type, gentle slope near source medium water type and gentle slope far source shallow water type. The gentle slope zone and steep slope zone of the sag are mainly distributed in nearshore subaqueous fan, fan delta, braided river delta and sublacustrine fan. The favorable facies zones of different sedimentary systems, source rocks, faults and others configuration combinations are favorable directions for hydrocarbon migration and accumulation.KeywordsFault block reservoirSedimentary systemFilling patternDominant phase belt
Published Version
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