Cretaceous paleogeomorphology restoration and its controlling mechanism on sand-bodies in Chunguang exploration area, Junggar Basin
Cheng Yi-Fan1, 2, Dong Yan-Lei1, 2, Zhu Xiao-Min1, 2, Yang Dao-Qing3, Wu Wei4, Yang Ke1, 2, Su Bin1, 2, Zhao Rui-Xing1, 2, Qiao Chen-Kai1, 2
1 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China; 2 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China; 3 Henan Oilfield Company,SINOPEC,Henan Nanyang 473132,China; 4 Taizhou Oil Production Plant,SINOPEC East China Oil & Gas Company,Jiangsu Taizhou 225300,China;
Abstract：Paleogeomorphology restoration is one of the significant methods of sedimentary study. The distribution of drilling wells in the Chunguang exploration area,Junggar Basin is uneven,which make it hard to evaluate the reservoir potential of the Cretaceous strata effectively in depression zone. Based on 3D seismic data,well logs and core observation,this paper restores the paleogeomorphology precisely by establishing sequence stratigraphy in study area,strata decompaction correction and restoration of denudation and paleo-water depth. The paleogeomorphology restoration of each Cretaceous sand group has recognized several kinds of geomorphologic cells,such as incised valleys,slope break belt and bulges. The restored results show that the sedimentary basin in the Cretaceous experienced the process of expansion,shrink and filled up,and the sedimentary system has great inheritance. Accurate paleogeomorphology restoration can reveal the sedimentary process of basin,which can improve the prediction of reservoir and the division of microfacies and has great significances for the study of sedimentary characteristics of the Cretaceous strata. Then we analyze the geomorphologic cells, control on sand-body distribution and sedimentary facies,and we think that the features of paleogeomorphology have obviously controlled the sand-bodies,e.g., the bulge can separate sand-bodies,the slope break belt has controls on sand-bodies, thickness variations and origin types and the incised valley serves as transport conduits for sand. Finally,we make detail descriptions of valley systems,summarize the patterns of valley systems(V-U-W)and analyze the sediment transport ability of each type of valley system.
Cheng Yi-Fan,Dong Yan-Lei,Zhu Xiao-Min et al. Cretaceous paleogeomorphology restoration and its controlling mechanism on sand-bodies in Chunguang exploration area, Junggar Basin[J]. JOPC, 2020, 22(6): 1127-1142.
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