Seismic sedimentology study of the Cretaceous in Chunguang exploration area,northwest of Junggar Basin
Dong Yan-Lei1,2, Chen Xiang3, Wu Wei4, Yang Dao-Qing3, Yang Ke1,2, Su Bin1,2, Cheng Yi-Fan1,2, Zuo Yi-Wei1,2, Zhao Rui-Xing1,2, Zou Tong1,2, Zhu Xiao-Min1,2
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：Seismic sedimentology is the effective method to depict the spatial and temporal distribution characteristics of sedimentary system. Taking the Chunguang exploration area in the northwest of the Junggar Basin as an example,the sequence boundaries and their distributions were analyzed at first,and the high-resolution sequence framework was thus built. And then the sedimentary types were identified combined with seismic,mud-logging,well-logging,core and analytic data. Under the guidance of seismic sedimentology,the distribution of sedimentary systems were depicted using several techniques including stratal slicing. The results show that: (1)the Cretaceous was divided into four third-order sequences and seven fourth-order sequences in the Chunguang exploration area;(2)four types of sedimentary facies types are identified,including fan delta,braided river delta,hyperpycnal-flow deposits and lake;(3)through the phase adjustment,a good corresponding relationship between seismic amplitude and lithology is established. The frequency decomposition,RGB blending and stratal slicing techniques were carried out,and the spatial-temporal distribution of sedimentary systems in the study area was depicted precisely. During the depositional period of the Hutubi Formation,fan delta was developed in the northwest of the study area,and braided river delta and hyperpycnal-flow deposits were developed in the east,sinuous channels and lateral accretion packages can be observed from the stratal slices. The lake transgression reached the maximum during the depositional period of the Shengjinkou Formation,and it was favorable to development and preservation of hyperpycnal-flow deposits. The inherited fan delta deposits were still developed in the northwest of the study area. Due to the uplift of the northwest area,it could be only developed in the east area with braided deltas and gradually decreased hyperpycnal-flow deposits during the depositional period of the Lianmuqin Formation.
Dong Yan-Lei,Chen Xiang,Wu Wei et al. Seismic sedimentology study of the Cretaceous in Chunguang exploration area,northwest of Junggar Basin[J]. JOPC, 2020, 22(3): 412-427.
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