Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (6): 72-81.doi: 10.12108/yxyqc.20230609

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Identification of carbonate dissolution valleys filled with mudstones of Cretaceous in block A,Oman Basin

FAN Rui1, LIU Hui1, YANG Peiguang2, SUN Xing1, MA Hui1, HAO Fei1, ZHANG Shanshan1   

  1. 1. Research Institute of Bureau of Geophysical Prospecting Inc., CNPC, Zhuozhou 072750, Hebei, China;
    2. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
  • Received:2023-05-12 Revised:2023-06-26 Online:2023-11-01 Published:2023-11-07

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Abstract: Based on seismic data,drilling and logging data,the seismic reflection characteristics and the distribution rules of carbonate dissolution valleys filled with mudstones of Cretaceous in block A of Oman Basin were studied by using seismic forward modeling and attributes,and the hydrocarbon accumulation model was determined. The results show that:（1）A dissolution valleys system filled with mudstones is developed in the west and middle of block A,Oman Basin,which is characterized by concave features,discontinuous reflection and weak amplitude. The dissolution valleys with depth greater than 3 m and width greater than 10 m could be identified using available seismic data.（2）By optimizing seismic attribute,it is found that Euler curvature could suppress the influence of dense faults and the effect of dissolution valleys identification is better than coherence and regular curvature attributes.（3）Combination traps of dissolution valleys filled with mudstones are identified whose total area is 80.66 km2 by the new identification technology. In addition,good oil and gas shows was revealed by a new well,confirming the reliability of this technology.

Key words: carbonate dissolution valleys, mudstone-filled barrier, forward modeling, curvature attribute, Cretaceous, Oman Basin

CLC Number: 

  • TE121.1
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