Oil & Gas Geology ›› 2020, Vol. 41 ›› Issue (6): 1139-1150.doi: 10.11743/ogg20200603

• Petroleum Geology • Previous Articles     Next Articles

Evolutionary characteristics of Linhe Depression and its surrounding areas in Hetao Basin from the Mesozoic to Cenozoic

Ruifeng Zhang1(), Fusheng Yu2, Xiheng Liu3, Jing Liu3, Shuguang Chen3, Chenlin Wu4, Yiqun Wang2, Shengliang Wang4   

  1. 1. Exploration Department of Huabei Oilfield Company, PetroChina, Renqiu, Hebei 062550, China
    2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China
    3. Exploration and Development Research Institute of Huabei Oilfield Company, PetroChina, Renqiu, Hebei 062550, China
    4. Bayan Branch of Huabei Oilfield Company, PetroChina, Bayan Nur, Inner Mongolia Autonomous Region 015000, China
  • Received:2019-11-22 Online:2020-12-28 Published:2020-12-09

Abstract:

A major breakthrough, marked by two high-yield wells (Jihua 2X and Song 5), has been made recently in the Linhe Depression of the Hetao Basin after more than 40 years of exploration, thus revealing the great hydrocarbon potential of its Mesozoic-to-Cenozoic strata.A study on the tectonic evolution of the basin from the Mesozoic to Cenozoic may be of great contribution to the analysis of the deposition process and conditions for forming oil/gas traps.As a result, an integrated analysis of field outcrops, cores, geophysical data, and structural evolution of the basin was carried out and shows that a variety of structural deformation patterns are developed in the Linhe Depression and its surrounding areas from the Mesozoic to Cenozoic, including compression, extension, strike-slip, and inversion structures.The study area thereby experienced multiple-stage evolution from compressional depression (during the deposition of Lisangou Formation in the Early Cretaceous), depression-to-faulting conversion (during the deposition of Guyang Formation in the Early Cretaceous), uplifting and denudation (during the Late Cretaceous to Palaeocene), to weakly rifted depression (during the Eocene to Oligocene), strongly faulted depression (during the Miocene to Pliocene), and strike-slip transformation (during the Pleistocene to Holocene).The basin belongs to the multi-cycle superimposed type.And a genetic basin model was established to incorporate an early differential compression and a superimposition with late differential extension.

Key words: inverted structure, tectonic evolution, Mesozoic to Cenozoic, Linhe Depression, superimposed basin, Hetao Basin

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