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Author(s): |
Weifeng Sun, Shandong University of Science and Technology, Qingdao, China, 266510
Yuxiang Lin, Shandong University of Science and Technology, Qingdao, China, 266510
Xiaoyan Chi, Shandong University of Science and Technology, Qingdao, China, 266510
Tengfei Yu, Shandong University of Science and Technology, Qingdao, China, 266510 |
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Abstract: |
During Ordovician period, Huanghua Depression was a part of Huabei Epicontinental Sea, in which a set of carbonate formation was formed. The Lower Ordovician contains the Yeli Formation and Liangjiashan Formation; and the Middle Ordovician contains the Majiagou Formation and Fengfeng Formation; but the Upper Ordovician is missing. The paleogeography was characterized by two division zones of the south and north in early Ordovician, but in the Middle Ordovician, the paleogeography changed-there was a dolomitic lime flat along North-East strike in open Epicontinental Sea. The reservoirs of Ordovician in this area are changing from relatively good to relatively bad ones, which were characterized by higher porosity but low permeability due to post stage multi-deformation and multiple factors including lithology, sedimentary facies, diagenesis, fault and crack. Favorable reservoirs are distributed in Shenqingzhuang-Tanggu, Kongxi, Wangguantun, Nanpi-Wuqiao and Xuhei regions.
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