Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (4): 127-135.doi: 10.12108/yxyqc.20250412

• PETROLEUM EXPLORATION • Previous Articles    

Geophysical identification and distribution prediction of weathered crust reservoirs in Lower Paleozoic of Longdong area，Ordos Basin

WANG Yonggang1,2, DU Guanghong1,2, HE Run3, QU Chang1,2, SHE Yuwei1,2, HUANG Cheng1,2   

  1. 1. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Field, Xi'an 710018, China;
    2. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    3. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China
  • Received:2024-10-22 Revised:2024-12-25 Published:2025-07-05

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Abstract: Based on core data，well logging and seismic data，the well logging response and seismic reflection features of weathered crust reservoir of Lower Paleozoic in Longdong area of Ordos Basin were analyzed. Using impression method and seismic image enhancement， the paleogeomorphology features， fault-fracture system characteristics and the spatial distribution of weathered crust reservoir in pre-Carboniferous of the study area were clarified. The results show that： （1）The reservoir lithology in Longdong area mainly composed of mud crystalmicrocrystalline dolomite ， with an average porosity of 4.44% and an average permeability of 0.29 mD， belonging to tight reservoir. Based on genesis，they can be clasified into 3 types such as fracture-dissolved pore， fracture-dissolved vug，and dissolved pore，with fracture-dissolved pore as the main type.（2）Different types of reservoirs of the study area exhibit significant variations in well logging response and seismic reflection： fracturedissolved pore and dissolved pore display high acoustic transit time，high neutron， low resistivity，low gamma ray，and low density，and dark spots can be seen in imaging logging. However， imaging logging of fracturedissolved pore reservoirs shows high dip angle or reticular dark bands，and seismic profiles exhibit weak amplitude，high frequency，and discontinuous reflection characteristics. The seismic events has“truncation”feature. While dissolved pore reservoirs have strong continuity，medium-weak amplitude，and medium frequency reflection characteristics on seismic profiles，and the“truncation”feature is not obvious.The amplitude variation of fracture-dissolved vug reservoirs is small on conventional logging curves，and irregular intermittent dark bands are observed on imaging logging. On seismic profiles，they exhibit high-frequency，strong amplitude，and continuous reflection，and the seismic events has“truncation”feature.（3）The pre-Carboniferous paleogeomorphology of the study area can be classified into 3 subunits： karst highlands，karst slopes，and karst basins. Fracturedissolved pore and fracture-dissolved vug reservoirs are mainly sporadically distributed in a strip like along the peripheries of the karst highlands or slopes. The intersection area of NW and NEE faults serves as the primary development zone，while dissolved pore reservoirs are primarily found within karst basins. The weathered crust reservoirs developed at the tops of Ordovician Majiagou，Cambrian Sanshanzi Formation and Zhangxia Formation are distributed in a ring-shaped pattern along the inner side of structural closures. Based on comprehensive evaluation，12 favorable areas for gas-bearing weathered crust reservoirs of Class Ⅰ with an area of 208.47 km2 and 10 favorable areas of Class Ⅱ with an area of 745.45 km2 have been selected.

Key words: weathered crust reservoir, dissolved cavity, fault-fracture, paleogeomorphology, logging response characteristics, seismic response characteristics, Lower Paleozoic, Longdong area, Ordos Basin

CLC Number: 

  • TE122
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