Abstract：It has been determined that Qigequan，Hongliuquan，Alaer，East Alaer，Ⅷ，Kunbei and Ⅺ fault slope-break zones developed during the Paleogene and Neogene by distinguishing the slope-break on geological and seismic profiles，recognizing the slope-break zones on contour map and identifying the true palaeo-fault slope-break on structural balance profiles，with a series of comprehensive means，including T0，petrology，microfacies and strata thickness.The vertical development of fault slope-break zones can be divided into the embryotic stage(Paleogene)and the flourishing stage(Neogene)due to long distance effects of Tibet Plateau uplifting.The slope-break zones in shallow water controlled braided rivers and delta plain.Gravity flows may develop below the deep water slope-break zones.The sedimentary facies between those two belts are delta front and beach & bar which are the main exploration fields at present.The area below Ⅺ fault slope-break belt has the condition to develop deep-water turbidite and even might be the replacing for lithologic hydrocarbon reservoirs.
Shi Hui,Liu Zhen,Ding Xuguang et al. Fault slope-break zone and sedimentary facies distribution of the Paleogene-Neogene in southwestern Qaidam Basin[J]. JOPC, 2013, 15(3): 317-326.
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