《Table 1.Element testing data of upper member of Lower Ganchaigou Formation in Yingxi and adjacent a

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《"Genesis of lacustrine carbonate breccia and its significance for hydrocarbon exploration in Yingxi region, Qaidam Basin, NW China"》

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The Yingxi area is located at the northwestern end of the Yingxiong range，one of petroleum-rich structural belts，Qaidam Basin.Affected by the continuous contraction and strike-slip superimposed effect of the Kunlun Mountains and the Altyn tagh Mountains during the Himalaya movement，there are many groups of NW-trending thrust faults were developed in the area（Fig.1a）.The Cenozoic sedimentary sequences in the Qaidam Basin have been divided into seven stratigraphic units from bottom to top（Fig.1b）[22]:the Paleogene Lulehe Formation（E1+2）and Lower Ganchaigou Formation（E32），the Neogene Upper Ganchaigou Formation（N1）and the Lower Youshashan Formation（N21），the Upper Youshashan Formation（N22），Shizigou Formation（N23）and the Quaternary Qigequan Formation（Qp1+2）.The upper section of the Lower Ganchaigou Formation（E32）is the main lacustrine carbonate exploration target layer in the study area.The geochemical analysis of cores and elements show（Table 1）that the depositional environment of this formation featured arid and hot climate，material source under-compensation，and hypoxia reduction[23].As the lake basin water oscillation，then salinized and eventually turned into a brine lake basin[24]，four types of sedimentary rocks，including lacustrine carbonate rock，gray mudstone，rock salt and thin sandstone，with obvious mixing characteristics were deposited.The reservoir rock is mainly carbonate rock，accounting for more than 95%of the total thickness of the reservoir.