Analysis of high-resolution sequence stratigraphy and prediction of favorable sandbodies in the Upper Jurassic Qigu Formation in Fudong slope area, Junggar Basin
Yu Jingwei1 Liu Ni1 Wen Huaguo2 Zhu Yongcai3 Zhang Zongbin3
1 Karamay Campus of China University of Petroleum(Beijing), Karamay 834000, Xinjiang 2 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,hengdu University of Technology, Chengdu 610059, Sichuan 3 Exploration and Development Research Institute of Xinjiang Oilfield,PetroChina, Karamay 834000, Xinjiang
Abstract：The Upper Jurassic Qigu Formation is the main exploration layer in the Fudong slope area in Junggar Basin.Guided by high-resolution sequence stratigraphic theory,one long-term base level cycle,three mid-term base level cycles and ten short-term base level cycles are divided from Qigu Formation of Fudong slope area in Jungar Basin through outcrops,drilling cores,seismic and logging data. The long-term base level cycles have dominant compositional types of upward-deeper-shallower; upward-deeper and upward-deeper-shallower are two compositional types mainly developed in short-term and mid-term base level cycles,while upward-shallower type is not developed. Sandbodies developed in initial stage of mid-term base level cycles are favorable for reservoirs formation. In the high￣resolution sequence stratigraphic framework,sedimentary system is depicted through many data,and its evolution is mainly affected by tectonic movements. Based on works above,favorable reservoir sandbodies in the Member 1 of Qigu Formation are predicted by effective reservoir thickness,physical parameters and seismic technology of the frequency-divided inversion,and three targets are identified.
. Analysis of high-resolution sequence stratigraphy and prediction of favorable sandbodies in the Upper Jurassic Qigu Formation in Fudong slope area, Junggar Basin[J]. JOPC, 2016, 18(2): 265-275.
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